no. 2173. A REVISION OF THE BEMBICINE WASPS— PARKER. 79 



8. Fasciae on tergites continuous; labrum without transverse impression; seventh 



sternite conspicuously narrowed stenebdoma. 



9. Fasciae on second tergite inclosing a pair of black spots; lateral spots on sternites 



may be connected by apical lines 10. 



9. Fascia on second tergite not inclosing black spots; lateral spots on sternites not 



connected by apical lines 11. 



10. Dorsum of median segment not maculated; genital stipes as in fig. 156 .foxi. 



10. Dorsum of median segment bearing lateral spots; genital stipes not as in fig. 156. 



connexa. 



11. Sides of median segment and of thorax (excluding prothorax) black, or rarely 



with small spot on mesopleura 12. 



11. Sides of median segment and of thorax conspicuously maculated 15. 



12. Fasciae on tergites narrow, usually (but not always) all interrupted; ultimate 



tergite black spinolae. 



12. Fasciae on tergites broader, all except the first continuous; ultimate tergite macu- 



lated 13. 



13. Fifth flagellar segment spinose; pubescence normal; process on sixth sternite 



short, broad, and roundly pointed ; fasciae on tergites bright yellow... cameroni. 



13. Fifth flagellar segment not spinose; pubescence unusually well developed; 



process on sixth sternite narrow and sharply pointed ; fasciae on tergites white 

 or greenish yellow 14. 



14. Fasciae on tergites white comata. 



14. Fasciae on tergites greenish yellow primaaestate. 



15. Scutellum with a pair of lateral spots similans. 



15. Scutellum without lateral spots primaaestate. 



16. Second and sixth sternites without processes pruinosa. 



16. Second sternite with a longitudinal carina; sixth with two small approximate 



tubercles; seventh terminating in a spine 17. 



16. Process on sixth sternite simple, median, pointed; that on second more or less 



well developed, in exceptional cases lacking 18. 



17. Sides of thorax and median segment black; yellow on tergites limited to lateral 



spots beutenmulleri. 



17. Sides of thorax and median segment almost entirely yellow; tergites with con- 



tinuous broad yellow fasciae occidentalis. 



18. Scutum usually with a pair of more or less well developed discal marks; dorsum 



of median segment with a curved yellow fascia troglodytes. 



18. Scutum without discal spots; dorsum of median segment black 19. 



19. Postscutellum with a narrow whitish fascia; second sternite with a broad yellow 



fascia embracing the posterios part of the median process and may include a 

 pair of black spots melanaspis. 



19. Postscutellum immaculate; second sternite with triangular lateral spots that may 



be connected by narrow apical band 20. 



20. Markings of abdomen and sides of thorax white or creamy white; species some- 



what robust texana. 



20. Markings of abdomen and sides of thorax bright lemon yellow; species slender. 



helianthopolis. 



Females. 



1. Neither postscutellum nor dorsum of median segment (excluding postero-lateral 

 angles) marked with yellow 2. 



1. Postscutellum or dorsum of median segment or both marked with yellow 15. 



2. Fasciae on tergites all interrupted medially 3. 



2. A part or all of the fasciae on tergites continuous 9. 



3. Ultimate tergite strongly wrinkled belfragei. 



3. Ultimate tergite not wrinkled, punctate 4. 



