38 Journal New York Entomological Society. [Vm. xii. 



Air tube long, fully four times as long as wide, tapering regularly, a 

 little flared at tip (Plate I, Fig. ii), the basal pecten distinct, the 

 last two spines large and detached, followed by a single hair tuft at 

 about the middle of the tube, infuscated. Lateral comb a patch of 

 spines in about three rows (Plate I, Fig. 12), the single spines thorn- 

 shaped, minutely divided around the base (Plate I, Fig. 13). Anal 

 segment with a large dorsal plate which reaches near to the ventral 

 line but does not encircle the segment. Anal tuft normal, the ventral 

 brush large with small tufts preceding the barred area (Plate I, Fig. 

 10). Anal processes four, moderate, normal. 



Pupa not distinguishable from those of its allies. 



The larva falls between canadensis and sylvestris in its general 

 characters but is differentiated by its abnormally long air-tube, which 

 throws it in the "long-tubed section " of the synoptic table. 



Eggs were obtained by me at Durham, N. H., and Kaslo, B. C. 

 Preserved material examined, collected by Mr. F. Knab at Spring- 

 field, Mass., and by Mr. O. A. Johannsen at Ithaca, N. Y. 



EXPLANATION OF PLATE I. 



Fig. I. Cidex cantons Meig. , egg. 



Fig. 2. Larva, stage I. 



Fig. 3. A single spine of the lateral comb of joint 8. 



Fig. 4. A single tooth of the air-tube pecten. 



Fig. 5. Stage II, diagram of the anal segment. 



Fig. 6. A single tooth of the air-tube pecten. 



Fig. 7. The air-tube. 



Fig. 8. The lateral comb of the 8th segment. 



Fig. 9. Stage IV, antennae. 



Fig. 10. Diagram of the anal segment. 



Fig. II. The air-tube. 



Fig. 12. The lateral comb of the 8th segment. 



Fig. 13. A single tooth of the comb. 



