Dec, 19 15-] Lloyd: New York Triciioptera. 205 



swimming hairs are well developed. The lateral fringe is thick and 

 black; the projections of the last segment are much as in L. indivisus, 

 pi. 1 6, fig. 17. The dorsal surface of the first abdominal segment and 

 the chitinous plates (the latter subject to variation in the number of 

 teeth) are shown (left side only) in pi. 16, fig. 20. 



The Case. — Length 20-25 ^^- ! the breadth varies greatly accord- 

 ing to the material used in construction. The young larvse, before 

 they leave the grass on the stream's edge, make a case of the cross- 

 stick type common in this genus. When, as the time for pupation 

 draws near, they migrate away from the grassy area, their cases 

 take on an entirely different appearance being constructed of shells, 

 or small chunks of bark, or seeds, from the bottom. In the meadow 

 area at Michigan Hollow the building material used, after their mi- 

 gration from the shore line, consisted almost entirely of the shells of 

 water snails, — Planorbis and Sphccrimn, for the most part, — and of 

 oval seed.s. PI. 15, fig. 14, shows a case from this area. Higher up 

 in the same stream, where the waters are overhung with thickets, 

 the larvae use chunks of bark in the construction of their cases, pi. 15, 

 fig. 10. Different combinations of these materials are frequently 

 found and sometimes cases are encountered in which the front part 

 is made of shells or chunks, while the hind part retains the cross- 

 stick construction used in its previous environment. 



Limnephilus indivisus Wlk. 



Larval Habitat. — Upland pools or ponds which are rich in decay- 

 ing vegetation and are subject to desiccation during the middle or 

 latter part of summer. 



In waters which it inhabits this species is found in extraordinary 

 numbers, its cases almost covering the bottom of the pond during its 

 late larval period. 



Larval Habits. — During the period when water covers their habitat 

 the larvae can be found clumsily drawing their bulky cases over the 

 bottom of the pond, or climbing over the vegetation. Their activity, 

 apparently, does not cease during the winter months. 



Food of the Larvae. — The larvae apparently eat vegetable matter, 

 living or dead, with little discrimination for species or condition of 

 preservation. They may readily be seen browsing on dead and de- 

 caying cat-tail or sedge, or on living plant tissue, or scraping loose 



