THE CANADIAN ENTOMOLOGIST. 123 



brown and gray, with short gray hair. Anal segment and legs pale ash- 

 gray. Tubercles as before except segment 6, which is swollen ventrally, 

 with tubercles more prominent. 



P'ourth moult July 7th. 



Fifth Stage. — Length, 22 mm. Head 2.60 mm. wide, the deeply- 

 notched crown more pronounced. Body mottled brown and gray, with 

 triangular light gray patches dorsally on segments 6-10. A faint gray line 

 above spiracles. Tubercles reddish-brown and prominent on segments 2, 

 3, 5 and lo-ir. On 4, 6, 9 and anal segment they are small, scarcely 

 darker than ground. On under side of segment 6 reddish-brown. 



Fifth moult July 14th. 



Sixth Stage. — Length, ^;^ mm. Head 4 mm. wide, very angular, deeply 

 notched, rather deep and rounded posteriorly, variable grayish to dark 

 brown, with numerous fine blackish warts. Ocelli and mandibles dark 

 brown. Thoracic legs light brown. Body variable gray to dark brown. 

 Thoracic shield lighter. Entire body covered with light gray warts, giving 

 a crenulate appearance. A blackish triangular patch on under side of 

 segments 2 and 3. Tubercles on segment 6 beneath and on 2, 5 and 11 

 above large and prominent, reddish on 5 and 6, gray to light brown on the 

 other segments. Humps on 5 prominent. A broad broken yellowish 

 shade on under side of segments 4-8. Lilac on 9-12. Anal plate and 

 legs ash-gray, rough. Spiracles black-ringed. At rest the thoracic 

 segments are drawn in, and segment 2, with its prominent row of tubercles, 

 forms a striking hump. 



Larvae matured July 25th. Length, 45-48 mm. 



Pupa. — Head, thorax and wing-cases blackish-brown, segments a 

 shade lighter, brown on the somites and blackish-satin in the intersections. 

 The surface is very rough. Six raised humps appear on the head, four 

 situated between base of the antennae and two slightly above. Anal 

 segment is smooth, glossy black above. Cremaster with a strong spine 

 dividing into two outwardly curved hooks. Three smaller curved spines 

 on each side. 



The larvae formed a silk cocoon within and under moss in the breed- 

 ing cage. 



Food-plant. — Quercus. Oak. 



One male emerged on September 2nd. Normal dark form, with 

 nearly straight extradiscai lines in secondaries. The balance of the pupae 

 are laying over until spring. 



