88 THE CANADIAN ENTOMOLOGIST 



I append my notes on the larvae and pup^e of all four species as they serve 

 to amplify in some instances Dr. Dyar's notes; the figures of the pupcC show the 

 very characteristic arrangement of tubercular setae and secondary hairs, a feature 

 quite constant in each species. 



Trichoptilus lobidactylus Fitch. 



Larva (full-grown). — Head ochreous. Body cylindrical, green, with slightly 

 darker mediodorsal line, due to the dorsal vessel showing through the integument, 

 and containing on each segment centrally a minute black dot; several other 

 similar black points are scattered with more or less regularity over the integu- 



 



ment, the most constant being a single one midway between tubercles II and 

 III and another, rather linear in shape, before the spiracle. Subdorsally there 

 is a series of large, brownish, rectangular, chitinous patches extending across 

 the major portion of each segment and containing tubercles I and II which are 

 represented by two long brownish setae, arising from the centre of each patch, 

 very glutinous, swollen irregularly several times during their length and club- 

 shaped at their tips; the posterior portion of each patch contains two minute, 

 whitish, club-shaped setae. Tubercle III is represented on the abdominal 

 segments by a single long brownish seta, a short anterior whitish one and a 

 minute posterior hair (?IIIa of Dyar). Tubercle IV-j-V, directly below the 

 spiracle, consists of an anterior shorter and a posterior longer clubbed white 

 seta arising from a brownish base: there are usually also two further minute 

 white clubbed hairs situated respectively on the ventral and on the posterior 

 margins of this dark base. \^entral to the tubercles and on the posterior margin 

 of each segment are generally several minute white clubbed hairs. A single 

 white unclubbed hair arising from a dark base and surrounded by other minute 

 hairs probably represents tubercle VI and two or three small hairs at the base 

 of the prolegs constitute tubercle VH. 



On the thoracic segments the dorsal setae show some variation from that 

 normally found on the abdominal segments; on the mesothorax tubercle I + 11 

 consists of two long setae and one minute white one whilst on the metathorax 

 only a single long dorsal hair is found. On both segments tubercle III shows 

 two long setae. The prothorax has a row of six long hairs along the anterior 

 margin with a second row of six immediately behind these; the dorsal area 

 corresponding to the prothoracic plate is covered with fine, minute, white, 

 clubbed hairs. \"entrad and anterior to the spiracle is a tubercle bearing three 

 hairs. All spiracles pale, brown-ringed. Length 10 mm. 



The arrangement of tubercular hairs as listed above differs in several points 

 from Dr. Dyar's figure of the fifth abdominal segment of this species (1899, 

 Ent. Rec. XI, pi. 1, Fig. 1) but this is in the main due, I believe, to slight in- 

 constancy in the number of small white secondary hairs which may occur on 

 each primary tubercle; Dr. Dyar's figure accentuates these secondary hairs, 

 giving the impression that they are nearly as long as the primary, dark ones, 

 which was far from the actual case in all specimens examined by me. 



Pupa (Fig. 1). — Rather bluntly truncate at apex with four short horns 

 arising from the base of the antennal and eye-sheaths and a distinct sub-dorsal 

 ridge extending as far as fourth abdominal segment. Colour green, with the 

 horns and surrounding area extending over the prothorax vinous pink; a large, 



*Contributecl from Entomological Branch, Department of Agriculture, Ottawa, Canada. 



