Dec, I9IS] Lloyd: New York Trichoptera. 209 



and leaves and sticks litter the bottom. In this portion of the stream, 

 so far as we can see, there are no differences of conditions within its 

 waters. Yet this species, for the three years we have known it, has 

 inhabited an area of the stream not more than a hundred yards in 

 length. In this limited area it occurs in great numbers. 



Larval Habits. — Until the middle of the summer is past these 

 larvae rest or crawl slowly about over the bottom of the stream. As 

 the period for pupation approaches they congregate in great numbers 

 on submerged sticks or roots. Often they occupy every available 

 lodging space on a certain stick while other similar sticks of the 

 neighborhood are left entirely free from their presence. Only the 

 front ends of the cases are attached to the support, from which they 

 project at all angles. 



Food of the Larvse. — Stomachs examined contained quantities of 

 fragments of wood and leaves; nothing else. 



Period of Emerging. — Specimens in captivity emerged October 

 6-13; but it is probable that under natural conditions they emerge 

 throughout a longer period. 



Description of Larva^ Pupa and Case. 



Larva. — Length 16-18 mm.; breadth 2.5-3 "i"^- 



The Head. — The color is light brown, almost uniform, except the 

 dark circles indicating the position of the attachment of muscles and 

 a thick stipling of microscopic spots; the dorsal surface, especially 

 the frons, pi. 16, fig. 7, bears numerous pointed, spear-like processes 

 which are plainly evident in balsam mounts. The labrum, pi. 16, fig. 

 6, is brown with a darker mark behind the middle of its front mar- 

 gin, the innermost setae on its front margin are short and blade-like, 

 the outer setae of the front margin are longer, but blade-like, other 

 setae of the labrum are indicated by circles in the accompanying draw- 

 ing. The mandibles are black, with a line of dense yellow hair on 

 the top edge of the groove. 



The Thorax. — The prothorax is light brown with a slightly ob- 

 lique black mark on each side above the coxa; the top surface has, 

 in addition to numerous setae of the ordinary type, many shorter, 

 spear-shaped, forward pointing spines, not shown in the accompany- 

 ing figures; these are most numerous along the front margin, where 

 they project over the base of the head; the dorsal markings of the 



