220 AN 1NTRO1 \TOMOLOGY. 



.is. This genus includes the smaller of our represent 

 of the family, those having I about j; mm. 



proth. Of quite equal in width t<> 



Hi; the antennae are filiform; the \\ings 

 rly reticulated with stoi; 1 the fourth seamen 



the .led ami bilobecl. Our common speei 



//////</.'/. 1'his is black, with the head not narrowed posteriori}- ; 

 prothorax is a little wider than the head; and the feet and \vii 



black. I find the larva of this species common in the swifl 

 flowing creeks about Ithaca, adhering to the lower side of stone 

 the bed of the streams. It resembles in form a young Coryd. 

 or " Dobson." It has a pair of long tapering appendages >n < 

 of the first seven abdominal segments, similar to tho>e of C 

 dalis. It differs from Corydalis in that the caudal end of the l>< 

 is terminated by a very long tapering appendage ; and there are no 

 tufts of tracheal gills. It is probable that when the larva is full 

 grown it leaves the water and transforms in an earthen cell without 

 a cocoon, as is the case with well-known European speci 



Chauliodes. The species of Chauliodes are larger than the mem- 

 bers of the preceding genus, measuring from 30-60 mm. (1.2 in.- 

 2.4 in.) in length, and having an alar expanse of from 60-100 mm. 

 (2.4 in.~4 in.). They differ also in having ocelli; three in numbei, 

 and placed close together. This genus closely resembles the follow- 

 ing one, but can be distinguished by the characters given in the 

 table above. The two genera also differ in that the caudal appen- 

 dages of the male are conical and simple in Chauliodes ; while they 

 are in the form of forceps in Corydalis. The larva of Chaul: 

 also greatly resembles that of Corydalis. The abdomen is furnished 

 with similar lateral filaments, and anal pro-legs furnished with h< 

 Hut there are no tufts of tracheal gills as in Corydalis. The larva 

 of Chauliodes are aquatic, and probably carnivorous. 



Chauliodes feet; a common species with grayish wings 



and feather-like antenna,*. Chauliodes serrieornis is also common ; 

 this is a brownish-black species with the wings spotted with white, 

 and with serrate antennae. 



Corydalis. The characters by which this gen us can be n 

 ni/.ed have been given in the table above-, and in the discussion of 

 the preceding genus. \Ye have but a single common species, the 

 I It llgrammite-fly, Corydalis cornuta. This is a magnificent in 

 having an alar expanse of from 100-135 mm. (4 in.-54 in.). The 

 male is remarkable for the great size of its mandibles, which are 



