THE OAXAJ.AV ENTOMOLOGIST. 57 



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" Scotia, at least as far west as Lake Superior, while in the North it is 

 " found as high as the Great Slave Lake in the Hudson Bay Company's 

 " territory, and even, according to Kirby, to Latitude 65° N. on the 

 -" iMcKenzie River." 



I have now the mortification of finding that my Anticosti specimen 

 of what I claim to be a Pier is is now Ganoris oleracea ; but a var. to be 

 QzS\t^ borcalis. ]\Ir. Grote says that the species resembles /z'/^/r??^, but 

 that the peculiar elongated wings oi frigida are wanting. 



With a knowledge of the history of the Anticosti Pieris or Ganoris, 

 whichever it may be, I am prepared to state that the former does not 

 agree with the habits of Pieris oleracea, which is double brooded in 

 Canada and quadrupled in the south, while that of Anticosti has but one 

 brood during the season. 



The Qgg of oleracea is pear-shaped or oval, of a yellow green color, and 

 ribbed longitudinally with about fifteen sharp edged lines. The eggs are 

 deposited singly, rarely more than one on a leaf, on the underside. The 

 egg of the Anticosti Pieris is not pear-shaped, but oblong, pointed at 

 each end, flesh colored, smooth and without ribs. The insect never 

 deposits eggs underneath the leaves, but on the upper surface of its food 

 plant (Turritis stricta), and I have counted six on a single leaf The- 

 -caterpillar of the Anticosti Pieris is also difi'erent from that of oleracea. 

 It approaches the color of that of P. 7'apce, but without dorsal or lateral 

 stripe, and is pubescent. In fact, it is as different from oleracea as the 

 caterpillar of the latter is from rapce. It occurs to me that the argument 

 I have advanced regarding the Papilio of the Island applies also to this 

 Anticosti Pieris. I find that after examining a number, with few excep- 

 tions, the colors are constant ; and I cannot agree with Mr. Scudder that 

 the upper surface is " supplied with obsolete spots similarly situated to 

 '' those on the upper surface of P. rapcB of Europe." 



It is possible that the Pieris oleracea of the south and west may be 

 but races of this northern form. Mr. Scudder says that " No possible 

 *' step in the gradation from one extreme to the other is wanting, and both 

 " extremes are found equally among numerous examples from as widely 

 " distant places as Massachusetts and the Great Slave Lake ; although 

 " the suite of specimens with which I have made my comparisons seems 

 " to indicate that the paler forms are more commonly met with in the 

 " more southern localities, and that more heavily marked ones are the 

 '' characteristic forms of the north." 



