192 THE CANADIAN ENTOMOLOGIST. 



One male and four females bred on Poptdiis treinuloides at Keene 

 Valley, N.Y. 



Egg. — In slits on both sides of the slender jDetiole of a leaf, as 

 described by Dr. Lintner for viviinalis. 



First stage. — Head blackish; width, 3 mm. Body all pale, sordid 

 yellowish, warts concolorous, the structure as in the mature larva. 



Second stage. — As before. Width of head, .4 mm. 



Third stage. — The food shows as a greenish shade. Width of head, 

 .65 mm. The thorax is more yellowish than the abdomen. 



Fourth stage. — Head shining black, rounded, mouth rather pointed, 

 the sutures around the mouth pale; width, i mm. Abdominal feet 

 present on joints 6-1 1 and 13, short; thoracic feet just visible from 

 above. Simple, recurved, white hairs, four to five each from low, obscure, 

 concolorous warts, apparently six in two rows above the spiracle on two 

 indistinct annulets, and others more obscure, on the subventral folds. 

 Thorax a little enlarged. Colour yellowish, not shining, the food giving a 

 green tint by transparency, shading to ochreous on thorax and joint 12. 

 A row of little black dots subdorsally (often absent) and a row of large 

 lateral ones, one on each segment. Dorsal vessel dark. Anal plate con- 

 colorous with body. 



Fifth stage. — Head black or yellow around the clypeus ; width, 1.5 

 mm. irubdorsal and lateral spots large, square, black ; anal plate yellow. 

 Otherwise as before. Cocoon double ; made entirely of soft brownish 

 silk, of the texture of thin paper. 



Cladius solitaris, n. sp. 



In the absence of a male specimen, I cannot tell to which section 

 of the genus this species is to be referred. The larval characters, how- 

 ever, are very different from those of the preceding species, so that it is 

 probable we have to do with a Cladius proper or with Priophorus, most 

 probably the latter. The fly differs from the description of isomera, 

 Harr., ceqtmlis., Nort., axid simplicicornis, Nort. 



Female. — Antenn.x very minutely pilose, simple. Body shining 

 black, the wings hyaline with black veins; stigma faintly tinged with 

 luteous ; the lower inner cell of hind wings does not reach as far as the 

 cell above it, its lower outer angle somewhat pointed. Legs white ; the 

 anterior coxte, middle and posterior coxae except at tip, the femora 



