of the White Mountains. 619 



have, I will say, two species belonging to this section of 

 the genus, ranging from South Labrador to Great Slave 

 Lake, and occupying (so far as my actual observations ex- 

 tend) a region of country lying south of that wherein the 

 genus Chionobas flourishes. This section of the genus is, 

 then, characteristic of the boreal and subalpine regions, 

 just as Chionobas is of the arctic and alpine. 



Within the limits of the subalpine region there is also 

 found an Orthopteron belonging to the Genus Pezotettix, 

 to which, in the descriptions which follow, I have given 

 the name of P. g-lacialis. In Europe, the different species 

 of this genus have been found only in elevated situations 

 or high northern latitudes. M. de Saussure has, however, 

 described species on this continent from Labrador to Mex- 

 ico, but I can with dilficulty believe that they should be 

 generically associated. The only species on this conti- 

 nent I have myself seen, is the one here mentioned, and 

 that formerly described by me from Lake Winnipeg and 

 Anticosti, and until more complete descriptions are fur- 

 nished by M. de Saussure, I shall still consider it a boreal 

 and subalpine genus. 



Passing lower, we find the mountain or wooded region 

 corresponding altogether with the Canadian Fauna ; and 

 since the boundary line of the Canadian and Alleghanian 

 FauuEe upon either side of the mountains is at just about 

 this latitude, we may consider this a promontory of the 

 Canadian Fauna stretching southwardly along the moun- 

 tain chain, into the Alleghanian ; while the Alleghanian, 

 in its turn, creeps into the region of the Canadian Fauna 

 along the warmer banks of the rivers flowing southeast- 

 wardly. One has but to pass eight miles to the northeast- 

 ward of Mount Washington to have recalled to him, in 

 the valley of the Androscoggin, the Entomological Fauna 

 of the central portions of the New England States. In 

 this mountain region we have such phenomena as the re- 



