AQUATIC INSECTS IX NEW YORK STATE 399 



CORETHRELI.A Coquillett 



N. Y. Ent. Soe. Jour. 10:191 

 Plate 40 



Throuoh the kiudness of Prof. John B. Smith of Xew Bruns- 

 wick X. J. from whom I received specimens of hirvae, piijiae 

 and adults, I have been enabled to make a study of this inter- 

 esting species, which in the adult stage has already been 

 ■described under the name of C o r e t h r a b r a k e 1 e y i by 

 Mr D. W. Coquillett. 



From Corethra it differs in the following particulars: 



In both the male and female the thorax, scutellum, abdomen 

 find legs are sparsely covered with long coarse hairs, many of 

 these being as long as the fore metatarsus. The antenna of the 

 male is thickly covered with long hairs arranged all along the 

 shaft excepting on the apical half of the 13th, and all of the 

 14th and 15th, which have only short hairs. The ir»tli or 

 apical joint is slightly enlarged and conical [fig.S]. The an- 

 tenna of the female has a circlet of a few long hairs at the base 

 of each joint and another irregular circlet of somewhat shorter 

 hairs on the middle of it. 



In Corethra, at least in those species with which I am famil- 

 iar, the male has one circlet of many long hairs at the base of 

 each joint, standing nearly at right angles with the shaft. In 

 the female these hairs are fewer and shorter; the second circlet 

 of hairs wanting. In a balsam mount of Corethrella the 15 

 antennal joints can easily be counted. The eyes are reniform; 

 the palpi and probop-cis are short, the former about twice as 

 long as the latter; the metatarsus is longer than the following 

 joint and the tarsal claws [tig.T] are simple and much curved. 



Corethrella brakeleyi Coquillett 



Larva. The larva resembles that of ^Mochlonyx much more 

 <:'losely than that of Corethra; it differs from the former in hay- 

 ing the antennae attached near the middle line of the head at 

 ihe extreme cephalic end, hinged so that ithey move in a hori- 

 zontal ]>lane, and normally lie folded back against the side of 

 the head, as shown in figure 1 and 2. The head is transversely 

 oval. The antennae [fig.3] have three long curved spines and 



