28 N. S. ENTOMOLOGICAL SOCIETY 



Seventh Instar. Differs but little from preceding instars, 

 except in size and coloration, in which, however, there is con- 

 siderable variation. Head with frontal setae and punctures 

 on a level; clypeal setae nearer together than frontal seta and 

 puncture. Stipes with a few secondary hairs. Epicranium 

 shiny black except a yellowish stripe which follows the median 

 line of the face extending downward to cover two thirds of the 

 front, where it broadens out, partly covering the adfrontals. 

 The clypeus, antennae, maxillae and labium are yellow; the 

 mandibles shiny black. The general body color is dark brown 

 varying to almost black. The warts may be tawny, covered 

 with tufts of hair of the same color; or the dorsal and subdorsal 

 rows may be black, or nearly black with hair tufts of the same 

 color and body a much deeper brown. The specimens reared 

 were all very dark in color, but caterpillars were taken in the 

 open varying from very light tawny to very dark brown, or al- 

 most black both in color of body and of the tufted hair. On the 

 light colored specimens two lateral, light colored, interrupt- 

 ed stripes following the line of the supraspiracular and subspir- 

 acular rows of warts respectively, are found. These are ob- 

 scured or altogether indistinguishable in the darker forms. 

 Ventral surface dark ashy grey to black. Thoracic legs and 

 prolegs varying in color, usually yellowish with darker mark- 

 ings. Length after sixth moult, 40 m. m. — 45 m. m. Width of 

 head 3.8 m. m. — 4.2 m. m. When the larvae are full grown 

 and ready to spin their cocoon, they measure from 45. m. m. — 

 50. m. m. in length. 



The Cocoon. 



On reaching maturity, the caterpillar seeks a suitable place 

 and spins its cocoon, which is a loosely woven oblong structure, 

 composed chiefly of hairs from the body of the larva, often 

 with a little grass or particles of dried leaves mixed in. There 

 is little or no difference in the structure of the male and female 

 cocoon, other than size. The male cocoon measures 22. m.m. 

 — 25. m. m. in length and 14. m. m. — 1 5. m. m. in width; the 

 female is 30. m. m. — 32. m.m. long; 16 . m. m. — 20. m. m. in 

 width. 



The Pupa. 



Pupation takes place about two days after spinning. Both 

 male and female pupae are at first of a bluish green, turning 



