July, '07] ENTOMOLOGICAL NEWS. 28l 



u. Most of the hairs on the outer side of the posterior tibiae simple . 30. 



Most of the hairs on the outer side of the posterior tibiae plumose or 



branched 44- 



12. Most of the hairs on the outer side of the posterior tibiae simple . 45. 



13. Fovea extending below the antennal line J5- 



Fovea not extending below the antennal line 14. 



14. Most of the hairs of the outer surface of the posterior tibiae plumose 



or branched 46. 



15. Most of the hairs of the outer surface of the posterior tibiae sim- 



ple 16. 



Most of the hairs of the outer surface of the posterior tibiae 

 branched 18. 



1 6. The posterior tibiae at their apex twice as wide as the metatarsus . 49. 

 The posterior tibiae at their apex not twice as wide as the metatar- 

 sus 17. 



17. Species with three submarginal cells 50. 



Species with two submarginal cells 78. 



18. Species resembling arabis and allies 79. 



19. Abdomen with the second dorsal segment depressed three-fourths or 



more 22. 



Abdomen with the second dorsal segment depressed less than three- 

 fourths 20. 



20. The shining space between the facial fovea and the eye margin 



abruptly separated from the fovea 21. 



The shining space between the facial fovea and the eye margin not 

 abruptly separated from the fovea 89. 



21. The shining foveal space as wide as, or not as wide as, the fovea be- 



low 90. 



22. The first joint of the flagellum shorter than the second and third 



joints combined 23. 



23. The shining foveal space as wide, or not as wide, as the fovea be- 



low 95. 



The shining foveal space wider than the fovea below 98. 



24. The fovea extending below the antennal line 99. 



25. Abdomen satiny 26. 



26. The abdomen without patches that are more conspicuously satiny 



than the surrounding areas 27. 



The abdomen with patches that are more conspicuously satiny than 

 the surrounding areas 28. 



27. Eleven mm. in length, or nearly ; process of labrum rather rounded ; 



posterior legs with their tegument dark or black ; pubescence 

 on dorsum of thorax ochreous to reddish ; scopa of posterior 

 tibiae light in color ; anal fimbria golden or brown . . nivalis. 

 Seven to eight mm. in length, or nearly ; process of the labrum finger- 

 shaped in outline ; pubescence pale, i. e. whitish to ochreous ; 

 anal fimbria chocolate-brown or of an allied shade . . . placida, 



