AQUATIC INSECTS IN THE ADIRONDACKS 57I 



SERICOSXOlM^^XIIDAEi 

 I 



One specimen taken from hatchery trough June 19, 1900. 



Case. Cyhndric yellow case slightly curved, composed mainly of 

 silk with multitudes of spicules of fresh- water sponge. Length 10 mm. 

 Width tapers from 3 at the anterior end to 2 mm. at the posterior end. 



Larva. Length 8 mm. Width 1.5 mm. Head and thorax light 

 yellow. Lines of black chitin over each side of the mesothorax and also 

 on the dorsal side of the first segment, extending obliquely over the lower 

 tubercles. Numerous respiratory filaments occur on the second, third, 

 fourth, fifth, sixth and seventh segments both above and below. The 

 anal hooks are supported on two-jointed prolegs. 



2 



One specimen taken from hatchery trough June 19, 1900. 



Case. Length 8 mm. Tapers from 3 to i mm. in diameter. Com- 

 posed of small pieces of wood or bark and is of a straight cylindric shape. 



Larva. Length 7 mm. Width i mm. Head and prothorax yellow- 

 ish brown with numerous lighter dots. Mesothorax and metathorax 

 white. A black line curved outward is on each half of the dorsal side 

 of the mesothorax. Black line on margin of each coxa. In case of 

 the second and third pairs of legs this line extends nearly to the 

 rear margin of the mesothorax and metathorax. Abdomen white. On 

 the first abdominal segment a black line runs from the rear of the seg- 

 ment downward to the top of the lower tubercles. Numerous small fila- 

 ments occur on the second, third, fourth, fifth, sixth and seventh seg- 

 ments on both dorsal and ventral sides. The two two-jointed prolegs 

 each supports a single large hook with a smaller one at its base. 



lef»toce:ridae 



I 



One specimen taken June 19, 1900. 



Case. Cylindric case of bark slightly curved. Length 11 mm. 

 Width I mm. A slender piece of light colored wood is fastened along 

 one edge, extending two or three mm beyond the case at each end, and a 

 rectangular piece of wood is fastened to the case at the rear end on 

 the side opposite the slender stick. 



