Additions to the knowledge on the genus Carinostigmus Tsuneki (Hymenoptera Crabronidae: Pemphredoninae) from the Indian subcontinent with the description of two new species Author Rajan, Tessy 0000-0001-9482-7719 Western Ghat Regional Centre, Zoological Survey of India, Eranhipalam, Kozhikode, Kerala- 673006, India. tessy. rajan 3 @ gmail. com; https: // orcid. org / 0000 - 0001 - 9482 - 7719 tessy.rajan3@gmail.com Author Sureshan, P. M. 0000-0003-4722-6368 Western Ghat Regional Centre, Zoological Survey of India, Eranhipalam, Kozhikode, Kerala- 673006, India. tessy. rajan 3 @ gmail. com; https: // orcid. org / 0000 - 0001 - 9482 - 7719 & pmsuresh 43 @ gmail. com; https: // orcid. org / 0000 - 0003 - 4722 - 6368 pmsuresh43@gmail.com Author Kumar, P. Girish 0000-0003-2121-0165 Western Ghat Regional Centre, Zoological Survey of India, Eranhipalam, Kozhikode, Kerala- 673006, India. tessy. rajan 3 @ gmail. com; https: // orcid. org / 0000 - 0001 - 9482 - 7719 & kpgiris @ gmail. com; https: // orcid. org / 0000 - 0003 - 2121 - 0165 kpgiris@gmail.com text Zootaxa 2020 2020-11-18 4881 1 152 164 journal article 7934 10.11646/zootaxa.4881.1.9 9c4cb247-2c5b-44b8-975d-dbe356495cef 1175-5326 4426081 84F65745-9585-4F8A-AB69-4E177EADEE9C Key to species of Carinostigmus from the Indian subcontinent (based on females) 1. Mandibles bidentate................................................................................... 2 - Mandibles tridentate................................................................................... 3 2. Inner and outer mandibular tooth almost equal in length; metanotum with parallel vertical ridges converging slightly toward middle; following structures white: palpi, basal half of mandible, apex of labrum, underside of scape, and pronotal tubercle.................................................................................. C. bucheilus Krombein - Inner mandibular tooth distinctly shorter than outer; metanotum smooth without parallel vertical ridges; only pronotal lobe yellowish white to white, other structures testaceous............... C. parliensis Tessy, Sureshan & Girish Kumar , sp. nov. 3. Face with median ridge weak, without projection near middle [ Figure 19 of Krombein (1984) ]; groove along inner eye margin weakly crenulate; metasomal petiole stouter [ Figure 48 of Krombein (1984) ], 4× as long as median width................................................................................................. C. clypeolus Krombein - Face with median carina stronger and armed with erect projection near middle [ Figure 18 of Krombein 1984 ]; groove along inner eye margin strongly crenulate; metasomal petiole more slender [ Figs 49–52 of Krombein (1984) ], 5–8.5 × as long as median width............................................................................................... 4 4. Petiole stouter [ Figure 51 of Krombein (1984) ], about 5–6.5 × as long as median width.............................. 5 - Petiole more slender [ Figures 49, 50 of Krombein (1984) ], 7.5–8.5 × as long as median width........................ 7 5. Propodeal enclosure except basal section with irregular oblique transverse striations and smooth area posteriorly ( Fig. 18 ); apex of clypeus almost rounded, not emarginated.................. C. nepalensis Tessy, Sureshan & Girish Kumar , sp. nov. - Propodeal enclosure except basal section rugoso-reticulate ( Figs 28 & 37 ); apex of clypeus slightly emarginated.......... 6 6. Underside of head with strong longitudinal costae except median area with delicate longitudinal lineolations narrowly ( Fig. 24 ); mandible with narrow ivory streak near base............................................... C. costatus Krombein - Underside of head moderately densely punctate especially towards middle and usually with few parallel carinae laterally ( Fig. 33 ); mandible with no ivory markings.................................................... C. aterrimus (Turner) 7. Declivous surface of pronotum anterior to transverse ridge smooth or with only evanescent irregular rugulae; interocular distance at anterior ocellus 1.4–1.5 × that at antennal insertions.................................. C. congruus (Walker) - Declivous surface of pronotum anterior to transverse ridge with vertical rugae; interocular distance at anterior ocellus 1.2–1.3 × that at antennal insertions............................................................ C. griphus Krombein