1896.] NATURAL SCIENCES OF PHILADELPHIA. 47 



19. Anterior femora mostly black, abdomen with heavy dark 



bands 12 mentzelice 9 



Anterior femora entirely pale, abdomen with evanescent 

 bands 13 pallid'wr 9 



20. Head and thorax piceous, marginal cell obliquely truncate, 



abdomen ovate, size rather large 1 texana 9 



Thorax black except the green metathorax ; head green, 



front feneous 53 (eneifrons 9 



Thorax black except the blue metathorax ; head blue ; a 



yellow spot on each side of clypeus ... 18 semmerulea 9 

 Head and thorax green 21 



21. Females 22 



Males, size small, nervures and stigma testaceous, fore tibise 



yellow in front 4 arcuaia $ 



22. Abdomen broad, mandibles bidentate, marginal cell ob- 



liquely truncate 2 latior 9 



Not so 23 



23. Small, about 4? mm. long, nervures brown . . 52 phymatiz 9 

 Larger, nervures nearly colorless 68 v. nigrior 9 



24. Face below level of antenn?e all yellow or white, except 



clypeal dots in some. Males 25 



Face below level of antennae not all pale 43 



25. Face below antenna; white 2(i 



Face below antenme yellow 28 



26. Last three segments of abdomen rufous, the other banded 



19 crotonis. 



Abdomen yellowish-white, banded, face below antennre pel- 

 lucid white, first 4 legs all dull white except a dark streak 

 on middle tibiae 50 pellucida. 



Abdomen dark brown with white m"arkings 27 



27. Abdomen with about 6 white marks, or fewer yellowish 



spots 42 pectidis. 



Abdomen with two more or less developed w'hite bands, 



41 cladothricis. 



28. Legs black with a little yellowish 25 affinis. 



Anterior and middle femora marked with black, cheeks 



unarmed . . . . 29 



Anterior femora all yellow, the 4 anterior tibite not all yel- 

 low 33 



First 4 legs all yellow, or at least not marked with black or 

 brown 34 



