AMERICAN NEUROPTERA. 145 



(HRYSOPA Leach. 



The third cubital cell is unequally divided, the veinlet running 

 into the upper border of the cell. There are two series of gradate 

 veiulets in the wings, but sometimes one series is very short, espe- 

 cially in the hind wings. The antennae are rarely as long as the 

 wings. Type C. perla. 



There are in our fauna five distinct groups, one represented by 

 but one species. The nigrieornis section is very distinct by many 

 characters from the other forms. The species known to me are 

 tabulated below : 



1. Some of the longitudinal veins of wing black for some distance from their 



bases sell war zi . 



Longitudinal veins not black 2. 



2. An term se with basal portion (except joint 1) black. 5. 



Antenna; not black 3. 



3. Second joint of antenna; with a red ring 10. 



Second joint not red. 4. 



4. Venation al 1 green 15. 



Some of the cross-veinlets black in part 18. 



5. Pronotum margined with red 6. 



Pronotum not margined with red 7. 



6. Antennal sockets margined with red, basal joint of antenna without dark 



line eoloradensis. 



Antennal sockets without red, basal joint of antenna reddish or with a dark 

 stripe lateralis. 



7. Basal joint of antenna with a black line 8. 



Basal joint without line 9 



8. At least two spots on vertex of head. sabulosa. 



No spots on vertex liiieatieoriiis, 



9. A black dot each side on clypeus, radial cross-veins only partly black, ptero- 



stigma indistinct ; size large iiigrieorni*. 



No black dot on clypeus, radial cross-veins wholly dark, pterostigma brown- 

 ish in all wings ; size smaller eolmiibiaiia. 



10. Gradate veiulets green ; wings broad elilorophana. 



Gradate veinlets more or less black 11. 



11. Two black spots on clypeus, pronotum with large black spots 1:2. 



No black spots on clypeus 13. 



12. Inter-antennal spot forming an X elii. 



Inter-antennal spot forming a Y ,v]>siloii 



13. Divisory veinlet of third cubital cell almost wholly black ; veiulets connect- 



ing median and cubitus are wholly black; but four veinlets connect- 

 ing radial sector to median aswiinili*. 



Divisory veinlet black only at end ; veinlets connecting median and cubitus 

 green in middle; usually five veinlets connecting radial sector to 

 median 11 



TRANS. AM. ENT. SOC, XXIX. (19) APRIL, 1903 



