146 NATHAN BANKS. 



14. Costal veinlets almost wholly black ; vein at end of third cubital cell mostly 



black, smaller species ■ albicoi'U is. 



Costa] veinlets less black; vein at end of third cubital cell mostly green, 

 larger species oculata. 



15. Cheeks suffused with red, wings acute at tip 16. 



Cheeks not suffused, a narrow brown line; anterior wings hardly acute at 



tips plorabunda. 



16. Divisory veinlet of third cubital cell ends before middle of that cell and before 



the cross-veinlet ; southwestern species externa. 



Divisory veinlet usually ends at or beyond the cross-veinlet 17- 



17. Eastern specimens; anterior wings very slender and acute at tips-liarrisi. 

 Western specimens ; anterior wings less slender and not so acute. 



californica. 



18. Basal joint of antenna witli a reddish line above; pronotum margined each 



side with red, cross- veins nearly all black bimaculata. 



Basal joint of antenna; without line; pronotum not margined with red. . 19. 



19. A red angular transverse line from eye to eye just above antenna?. 



arizonensis. 

 No such line 20. 



20. Pronotum and abdomen with a median red stripe, no side marks. 



medialis. 

 No such median stripe 21. 



21. Pronotum with two or three red spots each side, thorax and abdomen also 



spotted on sides, and often a red dot on head near eye. 



quadri punctata. 

 Pronotum not spotted with red 22. 



22. Radial and costal cross-veins black in middle, green at liases, a huge species. 



erythrocephala. 



Radial and costal cross-veins black at ends, green in middle 23. 



2:;. Size large; wings broad ; cubital cross-veins and branches of radial sector not 



black at bases ; a red spot under each eye emuiicta. 



Size smaller ; wings narrow ; nearly all cross-veins black at bases 24. 



24. (Olor straw yellow; wings long and narrow, red stripe on cheek; no pale 



median dorsal stripe i llterru |>la. 



Color green 25. 



25. Black stripe from eye to mouth ; costal cross-veins of fore wings wholly black, 



wings rather broad cockerel li. 



Red stripe under each eye, costal cross-veins only partly black ; a pale median 

 dorsal stripe in life nifilabris. 



Chrysopa scliwarzi n. sp. — Face yellowish, with a black mark on each 

 cheek, a transverse black mark surrounding the bases of the antennre ; vertex 

 each side red, middle clear yellow. Antennse pale yellowish, unmarked ; palpi 

 marked with black. Pronotum red each side, yellow in middle; meso-and meta- 

 thorax yellow in middle, red on sides, the latter extending down on pleura. Legs 

 and abdomen green. Wings with green venation, the pterostigma long and dis- 

 tinct; in fore wings the subcostal vein is black for about one-fourth its length, 

 and the cross-veins adjoining are more or less black ; the anal vein and branches 

 are black for some distance. Of usual shape; wings rather narrow, plainly acute 



