58 THE CANADIAN ENTOMOLOGIST 



well-developed dorsal plate containing six long, black hairs on anterior margin, 

 overhanging the head, and two hairs on the posterior margin; several ver\' short 

 secondary hairs are also interspersed ; laterally, on prothorax, a small hair 

 ventrad to the plate and a raised tubercle with central long hair and several 

 short ones on the lateral flange. Extending from the first abdominal segment 

 is a centro-dorsal row of spines, each spine with terminal long hair and about 

 seven others at various heights on it, decreasing in size as base of spine ir- ap- 

 proached. A subdorsal row of spines extends over all the segments bu* the 

 prothorax, the spines being noticeably larger on thoracic segments, each with 

 terminal hair and 11—14 others between apex and base: a similar supra-spiracular 

 row is present wath rather fewer hairs on each spine; a subspiracular row is fiamd 

 on abdominal segments onl}^ being represented on the thoracic segment- b\- 

 two small hairs. A tuft of hairs placed on a small tubercle is found ai: the 

 base of the legs and prolegs. The length of the spines is about equal t'j the 

 width of the segments. Length 3'/2 rnm. 



Stage III. Head black-brown, with pale front (clypeus) and mouth p.trts; 

 the apex of each cheek (epicranium) is well rounded and the central suture 

 deep ; on each lobe a pale stripe is present extending downward from apex lo a 

 point midway between mouth parts and apex. Body green, with very prominent 

 white spines thickly co^"ered with black-brown hair; the supra-spiracular ^pine 

 is preceded by a lunate patch of brown at its base, best defined on the posterior 

 segments. In late stages the dorsal and lateral lines turn dirty brown and a 

 pale subdorsal line crossing the spines is evident. Length 4'/2 mm. 



Stage IV. Head as in preceding stage. Body varying in colour rrom 

 deep muddy brown to pale greenish brown with rather broad subdorsal and 

 subspiracular creamy lines. Spines paler than the integument, thickly coxered 

 with brown hairs. At times the dorsal area is distinctly paler than the lateral 

 area between the subdorsal line and the spiracle and generally the spiracular 

 area is paler than the preceding lateral rows. Distinct tubercles are present 

 along the anterior edge of the prothorax. Length 6 mm. 



Stage V. Head black; apical two-thirds of front (clypeus), a streak across 

 the clypeus, a semicircular area extending on cheeks from palpi around and 

 above the eyes, and a vertical band from apex of cheeks to centre of same, white. 

 Eyes white, situated on a black patch. Body deep purple-brown, the spines 

 generally somewhat paler, arising from a white base; at times the supra-spiracular 

 row is deeper in colour than the integument. Over the whole surface minute 

 white spots are scattered, most numerous in the spiracular area, giving the 

 appearance of a broad, pale, spiracular band; a pale subdorsal line, a faint 

 supra-spiracular one and a very distinct subspiracular one; in late stages traces 

 of orange at the bases of the subdorsal spines appear. Length 10 mm. 



vStage VL Head as in preceding stage, the extent of the lateral white 

 area at base of cheeks rather variable. Body much as before with narrow, 

 well-defined, pale yellow, subdorsal and broader subspiracular bands. Spines 

 arising from a pale base and with white tip; hairs black-brown. Spiracle black; 

 legs black; crotchets of prolegs arranged in a double row. Length 21 mm. 



Pupa. — (Figs. 8—10). Ground colour pale creamy, but so thickly xcined 

 with brown and purplish as to appear superficially pale brown with whitish 

 shadings. Shape much as in Scudder's figure of P. tharos; apex slightly truncate. 



