SII'.KA.M II.Y I. TRYXALIN 7 JE. 



219 



The types of Thomas were from Montana and the specimens 

 at hand are from the Big Horn Mountains, Wyoming. While the 



main distribution of the species is in the North- 

 west, ranging from northern Minnesota, west- 

 ern Nebraska and central Colorado to Idaho 

 and northwestern Alberta, and southwest to 

 Beulah and Cloudcroft, New Mexico, it extends 

 eastward at least to Nipigon and the Severn 

 River, Ontario, and has been taken at Isle Roy- 

 ale, the Porcupine Mountains, Pequaming, and 

 in Dickinson Co., Mich. At Nipigon Walker 

 (I'M)!), 176) found both long-winged and short- 

 winged forms, the tegmina of the former meas- 

 uring, male, 18 ID, female 21 22 mm. About 

 requaming, Mich., Hebard took seven speci- 

 mens, all males. "On Sept. 5 two were captured 

 Fig. 82. Dorsal view while stridulating on the top of some decked 



of f h emie an x 3$ hemlock logs. They were very spry, somewhat 



resembling in their movements and the sounds 



which they produce the males of conspersa." 



The records show that C. abdominal-is is essentially a moun- 







tain-loving species. Near Fort William, Out., Walker found it 

 ''most numerous on the summit of Mt. McKay, where it fre- 

 quented the small openings in the scrubby woods." Brunei' (1897, 

 128) says that it "occurs only in extreme western Nebraska, where 

 it is partial to north hill-slopes and steep canon walls." R. & H. 

 (1900, 307) record it from Mammoth Hot Springs, Yellowstone 

 Park and Manitou, Colo. At the former place it was found in a 

 small glade at the top of the foot hills, the males being "very 

 quick and wary, but the females extremely heavy and slow, ap- 

 pearing to rely a great deal on their protective resemblance to a 

 bit of twig. The stridulation of the male much resembles that of 

 C. conspersa but is not nearly so loud." 



V. AMPHITORXUS McNeill, 1897, 190. (Or., "both sides" + 



"well rounded.") 



Medium sized Tryxalimp having the head short, horizontal; 

 vertex advanced in front of the eye less than half the interocular 

 width, its disk feebly concave each side the short median carina, 

 apex obtusely rounded, sides scarcely elevated; frontal costa wide, 

 shallowly sulcate at and slightly above the ocellus, nearly flat 

 and with margins a little divergent below ; antenna? filiform, fee- 



