Larva. 



AQUATIC INSECTS IN THE ADIRONDACKS 559 



Length 5.5 mm; greatest breadth of body exclusive of 

 spmes I mm. 



Color yellowish to greenish, varying with the color of the sponge, 

 obscurely marked with brown ; a middorsal incomplete stripe, darkest on 

 the thorax (where also is a lateral one each side), divided and more 

 interrupted on the abdomen. 



Antennae setaceous, very sharp pointed, a very little longer than the 

 piercing mouth parts, 15-jointed, the two basal joints turgid, meeting at 

 an angle, the other segments narrowly cylindric. 



Mouth parts adapted for piercing and sucking the sponge substance; 

 labrum and labium rudimentary; mandibles and maxillae developed as 

 long, channeled, decurved stylets, which may be applied in pairs, or all 

 four together.^ 



Body with two rows each side of dorsum of mostly trifurcate, triseti- 

 gerous tubercles; a pair of simple, unisetigerous tubercles on the ventral 

 side of the eighth abdominal segment. loth abdominal segment not 

 setigerous; extensile, bearing the spinneret. 



Fig. 36 Labia 



a. of Climacla dlctyoua Ndm 

 bof Sisyra umbrata Ndm 



Very soon after my arrival at Saranac Inn, M. A. Roberts, a careful 

 and observant employee of the Adirondack hatchery, called my attention 

 to some minute, hemispheric, silken pupa cases, attached to the sides of 

 the supply troughs in the hatchery building. There was an outer covering 

 of coarse silk (pi. 12 fig. 4, 5) woven in hexagonal meshes, like bobbinet ; 



1 These are cast off, and the normal biting mouth parts developed during metamorphosis. 



