THE CANADIAN ENTOMOLOGIST. 227 



rows, one to each, of small tubercular flattened points, pale or whitish- 

 yellow ; from 2 to 13 a white stripe along base, just over the spiracles, and 

 above this the ground is yellowish for a little way ; a medio-dorsal yellow 

 line and sometimes a fine line on middle of side ; yellow tuberculated 

 points over the legs, in arcs of from 3 to 6 ; on foremost ridge of 3rd seg- 

 ment, high on the side, a dead black tubercle, a little raised and rounded, 

 in yellow ring ; spiracles in brown ovals ; surface covered with a fine 

 short down ; head obovoid, green, smooth, sparsely pilose ; the ocelli 

 brown. 



Occasionally the larvae in later stages are differently colored. One 

 had the dorsum dark green, edged on either side by a gray line, and suc- 

 cessively by a band of yellow, a gray line, and a black band ; the 3rd 

 segment was wholly, and 5th partly black. Two others of same brood 

 were green, with a black band along base of body, and black patches on 

 3 and II. 



CHRYSALIS — Length .5 inch ; helmet-shaped ; compressed later- 

 ally, the abdomen somewhat carinated ; mesonotum high, rounded, sloping 

 abruptly to top of head case, much compressed and sharply carinated, fol- 

 lowed by a deep excavation  head case not prominent, square or nearly 

 so at top, a little excavated, the corners sub-pyramidal and scarcely at all 

 produced ; along carina of abdomen a yellow line, which forks and passes 

 round mesonotum to top of head case ; a slight yellow lateral line on 

 abdomen ; color green, either deep, or with a blue or a yellow tint ; the 

 abdomen much sprinkled with pale yellow flat points or small spots ; a few 

 of these about the head case. Duration of this stage 5 days in July, 7 

 days in August. 



I described and figured Bachmanni in both sexes, and also the &^^, the 

 two later stages of the larva, and the chrysalis, in Butterflies of N. A., 

 Vol. 2, Part I, 1874. At that time I was unable to give the complete 

 larval history. In subsequent years I have repeatedly taken the butterfly 

 and observed all of the preparatory stages. It is certain that in this region 

 this species appears in several successive generations, probably four, that 

 the later butterflies hibernate, and the survivors are on the wing early in 

 May, and probably in favorable seasons in April. The first generation in 

 descent from the hibernating females are on the wing in June ; the second 

 generation in July ; the third in August ; and late butterflies emerge from 

 chrysalis in September, and these would be of the fourth generation in 

 descent from the hibernating females. The period from laying of the egg 



