374 PHYSICAL GEOGRAPHY. 



and other parts of the White Mountains, and is common on the summit 

 of Graylock in Massachusetts ; it has also been taken at Norway and 

 other parts of Maine, and in Minnesota, and is abundant in the Red river 

 settlements of British America. It is a very shy insect, but stridulates 

 more loudly than other Acridians ; its note can be heard at a distance of 

 fifty feet. It usually makes four notes, but the number is sometimes 

 greater. The first, a quarter of a second in length, is duller than the 



Fig. s8. 



Note of Arcyptera gracilis. 



others, and is followed by a pause of a quarter second ; the other notes 

 are of the same length, but sharply sounded and follow each other rapidly. 



23. Pczotettix borcalis Scudd. This northern insect, originally de- 

 scribed from Minnesota, the Saskatchawan river. Lake Winnipeg, and 

 the Island of Anticosti, has since been mentioned from Speckled moun- 

 tain in Stoneham, Me., and occurs also among the White Mountains. 

 It is thought by some to be identical with P.frigida of northern Europe. 



24. Pe::oietti.v manca Smith. Described from a single specimen taken 

 on Speckled mountain, Stoneham, Me.; doubtless, therefore, it will be 

 found in the hilly parts of New Hampshire. 



25. Pezotettix glacialis Scudd. [Plate A, Figs. 5, 10.] I have found 

 this wingless Acridian most plentifully on Mt. Madison, the neighbor- 

 hood of the snow-bank in Tuckerman's ravine, and at the ledge, all 

 within the sub-alpine zone. In the latter place it frequents the branches 

 of the small birch trees. I am not aware that any other of our Acridians 

 are found habitually upon trees. I have found this species on Graylock 

 (Berkshire county), Mass. Mr. Sanborn has taken it about the Umbagog 

 lakes in northern Maine, and Mr. Smith on Speckled mountain, Stone- 

 ham, Me. Of this latter locality Mr. Smith says, — "It is in the south- 

 western part of O.xford county, and probably belongs to the White Moun- 

 tain group. I am not aware that its height has ever been determined, but 

 it is probably not much above two thousand feet. Upon the upper and 

 treeless part of the mountain, where all the species of Pezotettix occurred 

 [see the two preceding species], the following plants were abundant: 



