544 NEW YORK STATE MUSEUM 



hairs; lateral filaments more or less distinctly 5-segmented, tapering, 

 sparsely fringed with hairs, increasing in length posteriorly, on segment i 

 as long as the width of that segment; on segment 7 twice as long as 

 on I. 



Body smooth ; legs smooth at bases, hairy toward the tip, yellow ; 

 tarsal claws unequal, tipped with black. As with other semi -burro wers 

 and burrowers, the forelegs are closer together at base that are the legs 

 of the other pairs. 



Pupa. (PL 29, fig. 2.) Length (coiled) 9 mm ; width of head 3.7 mm, 

 of abdomen 4 mm. 



Body clad with soft, fine hairs, specially on head and thorax; head 

 and appendages pale yellow, varying with age. Thoracic dorsum yel- 

 lowish with broad, brownish or purplish marks at sides and on front 

 margins of segments ; abdomen short, thick, accurate, with obtuse but 

 prominent lateral margins, narrowed a little at both ends ; no sharp 

 angles or spines on any of the segments; apical segments mainly yellow ; 

 the others suffused more or less with brown or purple tending to be 

 arranged in a pattern as follows : a middorsal, narrow line ; a dorsolateral 

 interrupted band ; a lateral row of dots, three ventral rows each side of 

 unequal marks, confluent in stripes or interrupted ; sutures all darker. 

 There is a transverse, anteapical, impressed line of brown on the middle 

 abdominal segments. 



CHAULIODES 



Of the eight nominal North American species of this genus, but two 

 are recorded from this state. These two and a third occur at Saranac 

 Inn. 



These insects are less secretive than those in other genera of the 

 family. Images of some species ofChauliodes at least are abroad 

 habitually during hours of sunshine, making short, fluttering flights 

 from stem to stem. They rest most of the time : resting or flying, they 

 are easily taken with a net. 



The eggs are placed in somewhat. regular rows on the surface of some 

 leaf or other support; sometimes over water, but oftener at a short 

 distance from it. 



The larvae live in wet places at the edge of the water, or in water 

 close to the surface, and are perhaps oftenest found clinging to the under 

 side of floating logs or crawling beneath the loosened bark. They crawl 

 rapidly and cling securely by means of the claws on the thoracic legs and 

 on the bifurcated tenth abdominal segment. They swim but poorly by 

 means of undulations of the abdomen and lashing of the lateral filaments. 



The lateral filaments are less important respiratory organs than in 

 Sialis. While they contain tracheae, they also contain a larger pro- 

 portion of muscle and are covered by thicker integument. There are 

 nine pairs of well developed spiracles, one pair in the sides of the pro- 

 thorax at its hind margin, and one on each of the first eight abdominal 



