AQUATIC INSECTS IN THE ADIRONDACKS 545 



segments, situated just above the bases of the lateral filaments. The 

 pair on the eighth segment is more or less elevated above the surface of 

 the segment, being more on less extended in flexuous respiratory tubes. 

 These tubes may reach a length exceeding that of the lateral filaments. 

 They enable the larva to remain below while taking air at the surface of 

 the water. 



The genus is semiaquatic. 



The full grown larva finds a place above the level of the water under a 

 stone or log or layer of moss or in a rotten log and excavates a cell in 

 moist soil or in rotten wood, in which without spinning a cocoon it 

 enters on a pupal period of about two weeks' duration. 



Three species of Chauliodes larvae were taken in the edges of 

 Little Clear pond and creek. None of them were raised. One of them 

 agrees with the larva figured asCh. pectinicornis^ by J. Bridgham 

 in Dr Lintner's eighth report as entomologist of the state of Ne.w York 

 (1893. pi. i). Another is distinguished by its size: it is too large to be 

 the larva of any known New York species save Ch. pectinicornis. 

 The third one should belong to Ch. rastricornis,^ and probably it 

 does; for it agrees with the larva of that species as figured by Prof. 

 Weed, and copied in the above mentioned report of Dr Lintner. Since 

 no specific differences in habits were noted for these larvae save that the 

 one referred toCh. pectinicornis was less aquatic, and since they 

 can not be referred to the species discussed below with positive certainty, 

 the structural differences between them may as well be briefly indicated 

 here. 



a The spiracles of the eighth abdominal segment widely separated, their 

 margius elevated but slightly above the level of the segment 



Ch. pectinicornis, supposition 



aa Spiracles of the eighth abdominal segment approximated and drawn out into 



a pair of long, flexuous, contractile respiratory tubes which surpass the 



tip of the abdomen 



h Respiratory tubes conspicuously unequal in length; the 10th abdominal 



segment including its claws two and a half times the length of the 



ninth ; the lateral filament of the 10th segment surpassing the tips of 



the claws by more than the length of the claws 



Ch. serricoruis, supposition 



&& Respiratory tubes about equal in length ; the 10th abdominal segment 



with its claws one and a half times the length of the ninth ; the lateral 



filament of the 10th segment surpassing the tips of the claws by less 



than the length of the claws Ch. rastricornis, supposition 



1 This, I take it, was a case of mlstakea determlnatlou. The larva was not reared ; It Is too 

 small to belong to pectinicornis; It is like larvae of Ch. serricoruis, bred by Mr Hen- 

 shaw and In the Museum of comparative zoology. I therefore refer it to that species. 



2 Ohio agrlc. exp. sta. Tech. ser. Bui. 1889. 1:7-10, pi. 1, flg. 3. 



