THE DISTRIBUTION OF INSECTS IN NEW HAMPSHIRE. 339 



there are several ponds or tarns of small extent, one in the deep gap 

 between Adams and Madison, at the head of King's ravine, at the height 

 of 4912 feet; several small ones upon the slopes of Adams and Jefferson; 

 two deeper ones, known as the Lakes of the Clouds, the highest sources 

 of the Ammonoosuc, lying at the base of Mt. Monroe on the Mt. Wash- 

 ington side ; and other small ones on the south side of Mt. Monroe. 



The alpine zone of Adams and Jefferson merely encircles their sum- 

 mits ; that of Mt. Washington stretches north-eastwardly along the ridge 

 which extends in that direction, occupying one or two successively lower 

 plateaus ; it also expands upon the opposite side of the mountain, over 

 the upper portions of the widely extended plateau known as Bigelow's 

 lawn, but it scarcely attains the Lakes of the Clouds upon the one side, 

 or the edge of Tuckerman's ravine upon the other. 



Within the limits of the sub-alpine region, and generally preferring its 

 lower to its upper levels, we find a butterfly ( Brent his Mont inns) and a 

 grasshopper (Pezotettix glacialis), which, so far as yet known, are wholly 

 or almost wholly peculiar to this region. The butterfly has been taken 

 in scanty numbers but at various localities, such as the summit of Mt. 

 Madison, the plateaus just above the ledge, the gaps between Clay, 

 Jefferson, and Adams, the head of Tuckerman's ravine, the adjoining 

 portions of Bigelow's lawn, and the further extremity of the sub-alpine 

 belt upon the summits of Mts. Clinton and Pleasant ; it has also been 

 "seen" on the top of Black mountain in Thornton, but some other species 

 of Brenthis might easily have been mistaken for this ; yet it will probably 

 be found upon the summits of moderately high and barren mountains in 

 the neighborhood of the White Hills. The grasshopper is abundant 

 upon all the woodless parts of Mt. Madison, especially near the forest 

 line ; also, at and above the ledge, near the snow-bank in Tuckerman's 

 ravine, and on the warm hillsides above the latter. It has also been 

 taken on barren hill-tops near Norway, Me., and will doubtless be found 

 in any similar situation in the vicinity of the White Mountain range, 

 especially to the north. 



The butterfly belongs to a genus which consists of several groups, 

 some of which are found in the northern temperate regions of Europe 

 and America, extending also into the colder regions. Others inhabit sub- 

 arctic regions and high altitudes; while one group extends from the 



