26 N. S. ENTOMOLOGICAL SOCIETY 



Description of Ins tars. 



First Instar. Covered with long hairs nearly equal in 

 length to the body. The wart pattern characteristic of the 

 mature caterpillar can be plainly seen in this instar, viz., with 

 4 warts above the legs on the thorax and with three both above 

 and below the spiracles on the abdomen. There are also two 

 on the ventral surfaces of the 1st, 2nd, 7th and 8th abdominal 

 segments. Those of the subdorsal row (II) and of row VI, and 

 of the subventral row on the abdominal segments, 

 1, 2, 7 & 8 bear two hairs, others one. Head and 

 thoracic legs shiny black. Body hairs black except those on 

 row V, which are grey in color. General color at first, light 

 yellowish brown, becoming dark. Length when freshly hatched 

 1.75 m. m. — 2.02 m. m. head .35 m. m. — .38 m. m. in width. 



Second Instar. This stage is readily distinguished from 

 the preceding by the development of prominent warts instead 

 of the more or less simple tubercles that characterized the first 

 instar. These are relatively large, rounded elevations bearing 

 tufts of hair instead of only one or two hairs as formerly. The 

 dorsal and ventral abdominal warts are smaller than the others: 

 the subdorsal is most prominent. General coloration, tawny 

 yellow. There is an interrupted white dorsal stripe, a dark 

 subdorsal stripe following the line of the warts and tawny lat- 

 eral stripes. Color lighter at segmental margins. Head, 

 thoracic shield and legs, warts and anal shield, dark red turn- 

 ing to black. Length after first moult, 3.0 m. m. — 4.0 m. m. 

 Width of head, .525 m. m. — .529 m. m. Otherwise similar to 

 preceding. 



Third Instar. Length after second moult, 7.0 m. m.— 

 8.0 m. m. Head, .812 m. m. — .84 m. m. in width. Otherwise 

 similar to preceding instar. 



Fourth Instar. Length after third moult, 10.0 m. m. — 12.0 

 m. m. Head .94 m. m. — 1.08 m. m. in width. Otherwise sim- 

 ilar to preceding. 



Fijth Instar. Length of body after fourth moult has been 

 cast, 15.0 m. m — 20.0 m. m. Width of head, 1.62 m. m— 2.0 

 m. m. Otherwise similar to preceding. 



Sixth Instar. Length after moulting the fifth time, 25.0 

 m. m.— 30.0 m. m. Width of head 2.0 m. m.— 2.4 m. m. Other- 

 wise similar to preceding instar. 



