THE DISTRIBUTION OF INSECTS IN NEW HAMPSHIRE. 335 



climate, the antagonism of other insects, and many other causes still 

 unknown. 



It may be well to enter with more detail upon the probable limits of 

 the belt colored blue on Plate B. At the north, it enters New Hampshire 

 from Maine near the range of hills lying east of Pinkham's notch, 

 and comes from the direction of Bethel or Norway, Me. That the latter 

 town lies near the boundary between the Alleghanian and Canadian 

 faunas is evident from the extensive collections of Messrs. Verrill and 

 Smith. From this point it runs between Bartlett and Conway toward 

 Plymouth, passing just north of the latter town, following up Baker's 

 river toward the Connecticut, and only crossing the latter stream at some 

 distance above Wells river. At the north, on either side of the White 

 Mountains, the Alleghanian fauna extends along the river bottoms of the 

 Androscoggin, the Connecticut, and even the Ammonoosuc, but too nar- 

 rowly to be traced upon our map. Less is known about the southern 

 boundary of the band at its eastern extremity, but it must enter the state 

 between Dover and the sea, and it continues in a nearly straight line 

 through Milford to Warwick, Mass. Here it turns upward and toward 

 the Connecticut, crossing the river certainly above Brattleborough, Vt., 

 and perhaps as high as Walpole, N. H., where Mr. S. I. Smith has even 

 taken a specimen of Laertias Philenor. 



Thus far our examples have been wholly drawn from among the butter- 

 flies, as the best known group of insects; but our knowledge of the 

 Orthoptera is sufficiently advanced to show that the facts of their distri- 

 bution do not militate against the conclusions drawn from the study of 

 the butterflies. Among the Orthoptera of the Alleghanian fauna, Gryl- 

 lotalpa borealis, CEcanthus niveus, Phylloptera oblongifolia, Thyreonotus 

 dorsalis, Chrysochraon viridis, and Diapheromera femorata appear to 

 reach only the southern limits of our blue belt ; while Tragocephala sor- 

 dida, CEdipoda Carolina, Hippiscus phcenicopterus, H. rugosa, the different 

 Tettigideans (perhaps with the exception of Batrachidea cristata) and 

 Labia minuta probably extend to its northern boundaries. On the other 

 hand, among the insects of the Canadian fauna, Chloealtis conspersa, 

 Arcyptera lineata, A. gracilis, Trimeroiropis verruculata, and Cammula 

 pellncida find their southern limit at or near the southern extremity of 

 the blue belt ; the latter species also occurs on high ground farther south. 



