the genus Odynerus occurring in the Ethiopian Region. 491 



5. (4) Scutellum with lateral tubercles. 



6. (7) Colours black; abdominal segments 1-4 with pale yellow 



apical fasciae, tegulae black or red and yellowish white. 



katonai, Schulthess. 



7. (6) Colours ferruginous-red, abdomen with pale yellow fasciae, 



tergite 2 with a short yellow longitudinal line ; tegulae 

 ferruginous hisellatus, Schulthess. 



8. (3) Tegulae normal. 



{O. canaliculatus, Sauss., comes in here.) 



9. (12) Tergite 2 with a distinct tubercle or longitudinal carina. 



10. (11) Clypeus with 2 prominent longitudinal carinae, tergite 2 



with a longitudinal carina ; mesonotum with very coarse 

 longitudinal striation ; prothorax mostly black. 



carinatus, sp. n. 



11. (10) Clypeus without carinae, tergite 2 with blunt tubercle near 



base ; prothorax mostly ferruginous. 



quadrituberculatus. Smith. 



12. (9) Tergite 2 normal, no carina or tubercle; colours mostly 



ferruginous. Pronotum with anterior margin yellow, 

 tegulae mostly yellow, pubescence silvery. 



pulchripihsellus, Cam . 



13. (14) Head and thorax mostly with ferruginous markings; 



abdomen with narrow apical fasciae on tergites 1-4 ($), 

 1~7 ((J); clypeus broader than long. Small species 

 4|-5| mm conradsii, Schulthess. 



14. (13) Medium-sized species 7-8 mm. 



15. (18) Sides of median segment almost impunctate. 



16. (17) Ferruginous; postscutellum, post-tegulae and apical 



fasciae on tergites pale yellow; mesonotum black, with 

 coarse longitudinal striation. . rikatlensis, Schulthess. 



17. (16) Black; abdomen with white apical fasciae ; tergite 2 with 



large lateral spots, white. . metatarsalis, Schulthess. 



18. (15) Sides of median segment distinctly punctured ; mesonotum 



evenly punctured, postscutellum, post-tegulae and 

 clypeus basally, ferruginous. . . hansi, sp. n. 



19. (2) Scutellum flat, unarmed (except 0. dimorphus (J)); post- 



scutellum either forming two distinct tubercles or 

 truncate, crenulate or with lateral tubercles. 



20. (23) Tegulae abnormally large. 



21. (22) Postscutellum forming two distinct tubercles, tergite 2 



normally rounded. Length 1 1 1 mm. rubroniger, Bingh. 



22. (21) Postscutellum with slender lateral tubercles, tergite 2 with 



a longitudinal carina. Length 10 mm. kristenseni, sp. n. 

 {0. cameroni, Schultz, comes in here.) 



