476 NEW YORK STATE MUSEUM 



wanders far from water. Corvdalis is nsiiallj crepuscular, and 

 is often attracted to lights at night. One large female was seen. 

 to make a flight of several rods, when apparently unmolested,, 

 on a bright, hot June day at 2 o'clock p. m. 



The adults are yery short-liyed, at least when kept in cages,. 

 and probably also when at large, judging from the short length 

 of the season when adults are to be found. Of the specimens 

 kept in cages, the males never lived longer than three days after 

 emerging, while the females lived as long as eight or 10 days. 

 None could be induced to take food, and it is probable that the- 

 adults take no food. The studies made b}- Mr W. A. Riley and 

 others indicate that very little histolysis takes place in the 

 digestive organs. This is explained by the jirobable fact that 

 these organs are not used in the adult insect. 



The dates on which adult specimens have been taken at Ithaca: 

 range from June 4 to July 8, in a long series of years. 



TABLE TO SPECIES OF CORYDALIS 



a Hastate or lanceolate pale mark on middle of 



hind part of protborax, irregular light marks 



each side 



b Costal cells of front wings mostly with two 



white spots in each 



c ;Male aippendages, upper pair, with tlie ends 



abruptly turned under and back, appearing 



as a separate segment 1 i n a ni a b i 1 i s- 



cc Male appendages, with upper pair not abruptly 



turned backward 2 c o r n u t a 



bb Costal cells of front wings with only one white 



spot in each Scognata;. 



aa Hastate and other marks on prothorax of same 



color as the rest or nearly so 



b Antennae with two basal joints and most of the 



others light yellow, outer three fourths with 



minute sharp teeth 



c Front wings with no dusky clouds in cells, 



except near the stigmatal region; white dots 



almost wanting 4 c r a s s i c o r n i s- 



cc Front wings with dusky and white clouds; 



Avhite dots numerous except in costal region. . "> p e i- u v i a n a 



bb Antennae with basal joints never yellow; seg- 

 ments of antennae never toothed 

 c Costal cells often with two white dots in each 

 d Front wings hardly clouded except in region 



of stigma G 1 u t e a 



