A revision of Northern Vietnamese species of the ant genus Pheidole (Insecta: Hymenoptera: Formicidae: Myrmicinae) Author Eguchi, Katsuyuki text Zootaxa 2008 2008-10-15 1902 1 1 118 https://biotaxa.org/Zootaxa/article/view/zootaxa.1902.1.1 journal article 10.11646/zootaxa.1902.1.1 1175­5334 5134231 Pheidole vieti sp.n. Figs. 28a–h Pheidole sp. eg-112. Eguchi, Bui et al. 2005: 91 (checklist). Type material examined: Holotype : major, Ba Vi N.P. , 400–600 m alt., Ha Tay (misspelled as “ Ha Tai ”), Vietnam [ K. Eguchi leg., colony: Eg99-VN-092] ( IEBR ); paratypes : 5 minors from the same colony as holotype ( IEBR , MCZC , MHNG & ACEG ). Other material examined: Vietnam : Vinh Phuc : Tam Dao N.P. , 21°27’N , 105°38’E , 950 m alt. [ Sk. Yamane ]; Ha Tay (misspelled as “ Ha Tai ”): Ba Vi N.P. , 600 m alt. [Eg99-VN-104]. Eguchi’s informal species code “ Pheidole sp. eg-112” applies to this species . Worker measurements & indices: Holotype (major). — HL 1.21 mm ; HW 1.16 mm ; CI 95; SL 0.62 mm ; SI 54; FL 0.81 mm ; FI 70. Nontype major (n=1). — HL 1.22 mm ; HW 1.17 mm ; CI 96; SL 0.60 mm ; SI 51; FL 0.79 mm ; FI 68. Minor (n=3, including one paratype minor). — HL 0.59–0.64 mm ; HW 0.55–0.60 mm ; CI 92–94; SL 0.59–0.61 mm ; SI 103–109; FL 0.63–0.68 mm ; FI 114–117. Worker description Major. — Body yellowish brown. Head in lateral view not impressed on vertex; frons and anterior part of vertex rugose longitudinally; posterior part of vertex sparsely and interruptedly sculptured with longitudinal rugulae; dorsum of vertexal lobe shagreened or only very weakly rugoso-punctate; frontal carina inconspicuous, present just as rugula(e); antennal scrobe almost absent; clypeus without a median longitudinal carina; median prosess of hypostoma variable in its development, conspicuous (nontype major) or completely absent (the holotype ); submedian and lateral processes conspicuous; antenna with a 3-segmented club; eye consisting of less than 20 ommatidia; maximal diameter of eye shorter than antennal segment X. Promesonotal dome smooth and shining, in lateral view lacking a mound on its posterior slope; humerus of the dome not produced; the dome at the humeri much narrower than at the bottom; mesopleuron weakly punctured largely; lateral face of propodeum almost smooth; metapleuron with several rugulae. Petiole a little longer than postpetiole (excluding helcium); postpetiole relatively massive. First gastral tergite smooth and shining excluding very weakly punctured area around its articulation with postpetiole. FIGURE 28a–d, Pheidole vieti sp.n. , holotype (major) [Eg99-VN-092] — a, head in full-face view; b, head in lateral view; c, mesosoma and waist in dorsal view; d, mesosoma and waist in lateral view. FIGURE 28e–h, Pheidole vieti sp.n. , paratype minor [Eg99-VN-092] — e, head in full-face view; f, head in lateral view; g, mesosoma and waist in dorsal view; h, mesosoma and waist in lateral view. Minor. — Body yellowish brown. Frons and vertex smooth; dorsolateral part of head partly to largely rugoso-punctate weakly or dimly; preoccipital carina complete but weak dorsally; median part of clypeus smooth and shining; the median longitudinal carina absent, or present at most anteriorly; antenna with a 3-segmented club; scape exceeding posterior margin of head by 1.5 times the length of antennal segment II or more; eye consisting of only ca. 8–12 ommatidia; maximal diameter of eye shorter than antennal segment X. Promesonotal dome largely smooth and shining, in lateral view lacking a mound on its posterior slope; humerus of the dome in dorso-oblique view not produced; mesopleuron punctured; metapleuron and lateral face of propodeum very weakly punctured or almost smooth; propodeal spine elongate-triangular. Petiole almost as long as or only a little longer than postpetiole (excluding helcium); postpetiole relatively massive. Recognition: This species has the following combination of diagnostic characteristics: in the major head in lateral view not impressed on vertex; in the minor head and promesonotal dome largely smooth and shining; in the major dorsum of vertexal lobe shagreened or only very weakly rugoso-punctate; in the major frontal carina inconspicuous, present just as rugula(e), and antennal scrobe almost absent; in the major submedian processes of hypostoma conspicuous; eye relatively reduced, consisting of ca. 13–19 ommatidia in the major and 8–12 ommatidia in the minor; in the major and minor promesonotal dome without a mound on its posterior slope; in the major and minor humerus of promesonotal dome not produced laterad; in the major and minor postpetiole relatively massive. This species is similar to Pheidole vulgaris Eguchi , but head is shorter but higher and postpetiole is more massive in the major of the former than in that of the latter. Distribution & bionomics: Known only from N. Vietnam .