AQUATIC INSECTS IN NEW YORK STATE 479 



3 C. cognata Hagen 



1801 Cor yd a lis cognata Hagen, Synopsis Neur. N. Am. p. 193 

 1892 Cor yd alls cognata Banks, Am. Ent. Soc. Trans. 19:357 



General color luteons yellow; head large, broad, sides convex, 

 marked behind with two punctate ochraceous streaks, and a few 

 obsolete points; prothorax almost quadrangular, a little 

 narrower than the head, marked behind with a hastate mark 

 in the middle and ochraceous points each side; feet and legs 

 lurid, apex of tarsi obscurer, claws fuscous; wings yellowish 

 hyaline, cross veins dark, front wings with a dark marking on 

 base and apex of costal area, Ri clouded fuscous, costal cells 

 with one white dot, number of dots in other cells several, cross 

 Teins between all the branches of radius about nine to 11, 

 medius with three branches, Cu^ with three accessories. 

 Length to tip of wings 55 to 60 mm; alar expanse 80 to 100 mm. 



New Mexico, Phoenix Ariz. 



4 C. crassicornis McLachlan 



1868 C o r y d a 11 s c r a s s i c o r n i s McLachlan, Linn. Sac. Jour. 9:233, 

 pl.S, fig.2 



Body pale brown to yellowish; head very broad, flattened 

 above, finely rugose, blackish around the ocelli, front margins 

 tdack, ocelli yellow, head marked behind with three impressed 

 reticulated spaces; palpi black; mandibles of male very long, 

 blackish tubercles on inner edges, color same as head but darker 

 near the tips; prothorax scarcely longer than broad, hardly 

 •dilated behind, brownish with front margin blackish, the has- 

 tate median mark behind, and raised spaces each side of about 

 the same shade as the prothorax; mesothorax and metathorax 

 nearly equal in width to each other and to the prothorax or 

 slightly narrower than the hind margin of it; legs pale brown, 

 tarsi, knees, and parts of the tibiae dark fuscous; antennae as 

 long as the body or longer, thick, brown, sutures black, three 

 to four terminal joints black, basal joints bulbous, joints beyond 

 basal fourth with a short, straight, triangular tooth beneath; 

 appendages of male very long, slightly pilose; superior pair 

 nearly cylindric at base, tips dilated and truncated but suddenly 



