Taxonomic review of the ant genus Dilobocondyla from China (Hymenoptera: Formicidae), with a revised key to the known species Author Chen, Zhilin Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection (Guangxi Normal University), Ministry of Education, Guilin 541006, China & Guangxi Key Laboratory of Rare and Endangered Animal Ecology, Guangxi Normal University, Guilin 541006, China Author Li, Wenjie College of Life Sciences, Guangxi Normal University, Guilin 541006, China Author Zhou, Shanyi Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection (Guangxi Normal University), Ministry of Education, Guilin 541006, China & Guangxi Key Laboratory of Rare and Endangered Animal Ecology, Guangxi Normal University, Guilin 541006, China text Zoological Systematics 2019 2019-04-30 44 2 132 139 http://zoobank.org/fcaac7e2-429c-4bf3-8614-c3563b5d993e journal article 5444 10.11865/zs.201908 31b2b0f4-7954-4701-8a70-ccf7272da92b 2095-6827 4617124 FCAAC7E2-429C-4BF3-8614-C3563B5D993E Key to worldwide species of Dilobocondyla based on worker castes (synthesized from Wheeler (1924), Bharti & Kumar (2013) and Zettel & Bruckner (2013); most figures cited from AntWeb). 1. Head in full-face view with posterior margin strongly and continuously concave (except for D. fulva ) (Figs ANTWEB1008114, CASENT0914066) (Philippines) ......................................................................................................................................................... 2 Head in full-face view with posterior margin nearly straight or only weakly concave in middle (Figs ANTWEB1008116, CASENT0914065)...............................................................................................................................................................................8 2. Petiole with a sharp and highly raised transverse ridge (Fig. ANTWEB1008114); anterodorsal face of postpetiole with conspicuous longitudinal rugae (Fig. ANTWEB1008114; Philippines). ........................................................ D. carinata Zettel & Bruckner, 2013 Petiole without transverse ridge (Fig. ANTWEB1008115); anterodorsal face of postpetiole differently sculptured, without conspicuous longitudinal rugae (Fig. ANTWEB1008115)...................................................................................................................3 3. Mesosoma entirely or chiefly blackish brown or black (Figs ANTWEB1008117, ANTWEB1008118, CASENT0904711) ...............4 Mesosoma yellowish to light brown (Figs ANTWEB1008115, CASENT0908982, FOCOL 1970 ).....................................................6 4. Antennal scrobe moderately developed, dorsally limited by fine frontal carina that posteriorly fading and not reaching posterior corners of head (Fig. CASENT0914066; Indo-Australian Region) ......................................................... D. selebensis (Emery , 1898 ) Antennal scrobe strongly developed, dorsally limited by prominent frontal carina that reaches posterior corner of head (Figs ANTWEB1008117, ANTWEB1008118) .............................................................................................................................................5 5. Gastral tergite I with yellow base (Fig. ANTWEB1008117; Philippines).................................... D. rugosa Zettel & Bruckner, 2013 Gastral tergite I entirely dark (Fig. ANTWEB1008118; Philippines) ........................................... D. silviae Zettel & Bruckner, 2013 6. Frontal carinae not continuing to posterior corners of head and not so prominent; antennal scrobes moderately deep (Fig. FOCOL1970; Australia and New Guinea) .................................................................................................................... D. cataulacoidea (Stitz, 1911) Frontal carinae prominent, continuing to posterior corners of head; scrobes deeper............................................................................7 7. Boundary unconspicuous between dorsum of propodeum and declivity. Dorsum of mesosoma with reticulation, interspaces smooth and shining (Fig. CASENT0908982; Singapore)......................................................................................... D. fulva Viehmeyer, 1916 Boundary conspicuous between dorsum of propodeum and declivity. Dorsum of mesosoma with irregular rugae, appear dull (Fig. ANTWEB1008115; Philippines)................................................................................................... D. chapmani Wheeler, W.M., 1924 8. Mesosoma, petiole, postpetiole and gaster almost unanimously color (Figs CASENT0908983, CASENT0914065, ANTWEB1008116) ............................................................................................................................................................................................................9 Mesosoma, petiole, postpetiole and gaster distinctly bicolor (Figs CASENT0178565, ANTWEB1008027) .................................... 14 9. Anterior margin of pronotum with distinct ridge (Sri Lanka) ........................................................................ D. didita (Walker, 1859 ) Anterior margin of pronotum without ridge. ...................................................................................................................................... 10 10. Posterior margin of head nearly straight. Petiole relatively shorted, with DPI ≥0.60 (Fig. ANTWEB1008116; Philippines)................ ..................................................................................................................................................... D. oswini Zettel & Bruckner, 2013 Posterior margin of head with concavity at its middle. Petiole relatively elongated, with DPI≤0.52 (Fig. CASENT0914065).........11 11. Dorsal margin of propodeum in lateral view distinctly lower than pronotum (Figures see Varghese (2006); India).............................. ........................................................................................................................................................... D. bangalorica Varghese, 2006 Dorsal margin of propodeum in lateral view almost at same level with pronotum, or slightly lower than pronotum (Fig. ANTWEB1008030) ........................................................................................................................................................................... 12 12. Body brownish black; frontal triangle indistinct (Fig. CASENT0914065; Indo-Australian Region)..................................................... .................................................................................................................................................... D. borneensis Wheeler, W.M., 1916 Body red or yellowish brown; frontal triangle distinct (Fig. ANTWEB1008030) .............................................................................13 13. Head slightly longer than width; clypeus with delicate carinae, with anterior margin feebly emarginated in middle. Petiole much longer, more than twice length of width (Indonesia)........................................................................... D. karnyi Wheeler, W.M., 1924 Head wider than length; clypeus with a strong median and two lateral carinae, with anterior margin strongly emarginate in middle. Petiole comparatively short, less than twice length of width (ANTWEB1008030; Malaysia)............................................................... .................................................................................................................................................... D. yamanei Bharti & Kumar, 2013 14. Mesosoma, petiole and postpetiole black; gaster distinctly reddish brown ( Figs 7–9 ; China) .................................. D. rufida sp. nov. Mesosoma, petiole and postpetiole yellowish to blackish red; gaster brown to black........................................................................ 15 15. Gaster paler, with yellow pilosity (Indonesia)............................................................................... D. sebesiana Wheeler, W.M., 1924 Gaster brown to black, with whitish pilosity...................................................................................................................................... 16 16. Petiole more than 2.5 times length of width; dorsal margin weakly convex (Figs ANTWEB1008026, ANTWEB1008029)............ 17 Petiole less than 2 times length of width; dorsal margin distinct convex (Figs ANTWEB1008025, ANTWEB1008027).................18 17. Clypeus with 5 strong carinae. Body dorsum with subdecumbent hairs (Fig. ANTWEB1008026; China) ........................................... ................................................................................................................................................... D.gaoyureni Bharti & Kumar, 2013 Clypeus with 3 strong carinae. Body dorsum with stiff erect hairs (Fig. ANTWEB1008029; Vietnam) ............................................... ...................................................................................................................................... D. propotriangulata Bharti & Kumar, 2013 18. Gaster smooth and shiny. Legs smooth, yellowish brown (Fig. CASENT0912885; China and Vietnam) ............................................. .................................................................................................................................................................. D. fouqueti Santschi, 1910 Gaster reticulate and opaque. Legs opaque with fine sculpture, blackish (Figs ANTWEB1008025, ANTWEB1008027) ................19 19. Posterior corners of head blunt and not forming a dent. Posterior 1/3 of head dorsum without reticulation (Fig. ANTWEB1008025; Vietnam)......................................................................................................................................... D. eguchii Bharti & Kumar , 2013 Posterolateral corners of head acute and forming a dent. Posterior 1/3 of head dorsum with reticulation. (Figs ANTWEB1008027 & CASENT0908984).............................................................................................................................................................................20 20. Head castaneous. Anterior lateral angles of pronotum acute. Dorsum of petiole slightly convex in profile. Petiole with a digitation (Figs ANTWEB1008027 & CASENT0908984; Indonesia)...................................................... D. selebensis simalurana Forel, 1915 Head blackish. Anterior lateral angles of pronotum blunt. Dorsum of petiole arcuate in profile. Petiole with a strong antero-ventral tooth (Fig. ANTWEB1008027; India)............................................................................. D. gasteroreticulata Bharti & Kumar, 2013