1903] MELANDER: — XORTH AMERICAX SPECIES OF AMMOPHILA I 59 



Petiole extending beyond the hind trochanters; smaller species variable in pubescence 

 and wing-coloration i- violaceipennis Lep. 



13. Third submarginal cell small, barrel-shaped; eyes strongly convergent below 



12. pacijica Mel. and Br. 

 Third submarginal normal, /. c, broader below than above ..... 14. 



14. Front and middle legs in part red 9. mo rriso it i Ca.m. 



Legs entirelv black ............. 15. 



Is,. Petiole of abdomen short, not extending beyond hind trochanters; stout species 



4. grossa Cress. $. 



Petiole much longer; smaller species ......... 16. 



i6. Base of abdomen entirely ferruginous ......... 17. 



Only the sides of the first and second segments reddish . . . 5. mo/ifaua Cam. 



17. Legs densely pruinose ......... 7. alpcstris Cam. 



Legs sparsely pruinose ....... i. vtolaceipetinis'S^^'^. $ : 



18. Pro- or meso-notum transversely strigose ........ 19. 



Disc of thorax punctured or smooth, never with complete transverse strigae . 34. 



19. Thorax or legs in part red ............ -O. 



Ground color of thorax and legs entirely black ....... 2\. 



20. Head red; metanotum transversely striate .... 28. femigittosa Cvess. 

 Head black; metanotal striae becoming rugose laterally . . . 30. coHart's Cress. 



21. Abdomen wholly black above ........... 22. 



Abdomen in part red above ........... 27. 



22. Scutellum with strong longitudinal carinae ..... 43. ceres Cam. 

 Scutellum with longitudinal grooves or simply punctate ..... 23. 



2^. Pleurae with golden to silvery spots; abdomen almost wholly black ; clypeus of male 

 acuminate .............. 24. 



Pleurae with elongate silvery markings; third ventral in part red; clypeus of male 

 not produced .........■.••. 25. 



24. Tip of metapleurae with a marking of silvery pubescence . 13. ahbreviata Fabr. 

 Tip of metathorax not marked with glistening pubescence . 42. atireonotata Cam. 



25. Face wiih silvery pile and pubescence; metathorax transversely striate 



17. gracilis Lep. 



Face more or less silvery but with black pubescence also; metanotum with oblique 



striae at least in part .... ....... 26. 



26. Prothorax shorter, sculpture of thorax coarser and insect more pubescent 



23. barbata Sni. 

 Prothorax longer and comparatively stout; sculpture of thorax less coarse 



16. procera Dahlb. 



27. Black pilose species; upper part of metathorax velvet black, and arcuately strigose; 



wings fulvous . . . . . . . .31. extremitata Cress. J 



Not such species; pile in part lighter . . . ■ . . . . 28. 



28. Metapleurae rugosely punctate ........... 29. 



Metapleurae strigose . . . . . . . . . • . . . 33. 



29. Clypeus coarsely punctured; mesothorax pimctured at middle but becoming strigose at 



the sides ; disc of metanotum obliquely striated . . . 27. concfifor Sm. 

 Species not conforming with all these characters ....... 30. 



30. Face with whitish pubescence ; abdomen largely red . ..... 31. 



