294 



quently getting caught in the spray but apparently none the 

 worse for their temporary submergence. Tlie females are less 

 abundant than the males, the usual ratio being about 1 to 5. 



Egg. Ovoid, the micropylar end more acuminate, bright 

 yellow, becoming olivaceous as the contained larva develops; 

 chorion shiny, micropyle conspicuous ; length .3mm., width 

 .2 mm. 



These eggs are deposited just below the water surface, on 

 the rocks or submerged timber. They are placed in single layers, 

 often consisting of several thousands in a mass, evidently the 

 product of several females. The micropylar end is always up- 

 permost and no gelatinous medium surrounds them. 



Larva — The larva is elongate and cylindrical, of the usual 

 Chironomid type, and closely resembling that of Telmatogeton, 

 judging from Johannsen's figure.* The body pale greenish 

 when young, becoming olivaceous later; full-grown larva 

 18-20mm, Head brown, darker along clypeal suture, 

 oval, no eyes present; antennae very small, each con- 

 sisting of a single tubular segment bearing a pair of 

 pointed papillae; labium broadly triangular, bearing a broad 

 apical tooth and seven lateral ones; mandibles well developed, 

 each bearing five teeth. First segment of thorax longer than 

 the following two (which are equal) and bearing a pair of pro- 

 legs armed with booklets and setae. Abdomen with first eight 

 segments cylindrical and bare, the ninth and terminal bearing a 

 pair of prominent prolegs, each well armed with a criclet of 

 booklets. 



The larvae construct tough silken galleries over the rock 

 or other submerged surfaces, preferably where the water rushes 

 over the rock ledges with greatest force. These whitish silken 

 galleries are quite noticeable in these situations, and it is as- 

 tonishing that they are not often beaten to pieces after a heavy 

 mountain shower. 



Pupa. Thorax and wing-sheaths brownish, al)domen and 

 legs olivaceous ; length 7mm. ; the last abdominal segment ter- 

 minates obliquely and abruptly in a large sucker-like disk, re- 

 sembling in this character Tclniafof/cfoii. 



*New York Mus. Bull. 86; Entom. 23, pi. xxxiv, f. 12-13 (no de- 

 scription.) 



