THE DISTRIBUTION OF INSECTS IN NEW HAMPSHIRE. 359 



and still farther south, at Lewiston, even in the previous year! In 1870, 

 the vanguard of the army crossed the state, reaching Milford in May, but 

 they had even then penetrated as far as Springfield, in their march down 

 the Connecticut, and were abundant at Walpole. They swarm now in 

 every part of the state, not even excepting the Isles of Shoals, where Mr. 

 Thaxter found them in 1870, and the alpine zone of the White Mountains, 

 where I took fresh specimens in 1873. 



54. Ganoris olcracca Scudd. [Plate A, Fig. 8.] It is found through 

 out New England, although seldom abundant south of the annual 

 isotherm of 48. Northward and eastward it is everywhere abundant, 

 and continues to be so as far south as Williamstown, Mass., Dublin, 

 N. H., and Portland, Me. It rarely occurs south of the northern bound 

 ary of Connecticut. 



55. Lacrtias PJiilenor Hubn. [Plate A, Fig. 15, chrysalis, side view. 

 Fig. 17, ib., dorsal view.] In New England this butterfly is very rare. 

 In no locality has more than a single specimen been taken during a sea 

 son, excepting near New Haven ; one was taken and another seen by 

 Mr. Smith, at Walpole, N. H., in 1870. 



56. Pterourus Troilus Scudd. In New England this insect is not 

 uncommon in the three southern states, and has been found north of 

 Massachusetts, at Milford, not as common as Polyxenes (Whitney), 

 Dublin (Faxon), and Walpole, N. H. (Smith), and at Sudbury, Vt, 

 scarce (Scudder). 



57. Euphceadcs Glaucus Hiibn. [Plate A, Fig. 16.] This butterfly is 

 more widely distributed than any other of our swallow-tails, for it is 

 found in nearly every part of North America, from the Atlantic to the 

 Pacific, from Newfoundland to northern Florida, and from central Alaska 

 to California. Its northern limit in the eastern half of the continent 

 closely follows the dividing line between the Canadian and Huronian 

 faunas, as laid down by Allen. In New England it is everywhere com 

 mon, from the summit of Mt. Washington to Long Island sound, but is 

 more abundant in the northern than in the southern districts. In the 

 White Mountain region it is exceedingly abundant, and individuals are 

 often dusky and small, like those from Alaska. 



58. Amaryssus Polyxenes Scudd. This insect is rather uniformly 

 common throughout New England, although not mentioned by Gosse 



