1908.] NATURAL SCIENCES OF PHILADELPHIA. 391 



tion in size and the usual modifications of width and characters of 

 tegminal bars, as well as differences in the general light base color. As 

 the variability of this species is almost endless, it is hardly necessary to 

 call attention to any types except one which is suffused with ochraceous- 

 rufous, represented by all the Sonora Road Canyon specimens and 

 faintly approached by one from Tucson, and a very dull type, repre- 

 sented by several from Bright Angel rim (7,000 feet) and the single 

 individual from Wilhams. Other specimens, however, from the rim 

 of the Grand Canyon at Bright Angel are of normal contrast, and one is 

 extremely contrasted with quite pale base color. 

 Trimerotropis cyaneipennis Bruner. 



A series of sixteen males and seven females of this species was taken 

 at elevations ranging from 3,800 to 7,000 feet on and in the vicinity of 

 the Bright Angel Trail, Grand Canyon, September 11 and 12. The 

 majority of the specimens are strongly washed with reddish, the greater 

 portion of these reddish specimens being from elevations not exceeding 

 5,000 feet, this being evidently due to a protective color modification 

 influenced by the reddish exposure of that portion of the canyon walls. 

 A few individuals possess a more strongly contrasted coloration; the 

 pale color being unsuffused and the bar groups darker. These speci- 

 mens are from 5,000 and 7,000 feet. On comparing this series with 

 that in the Academy collection I find that specimens from the northern 

 portion of Arizona, south at least as far as Prescott, have the disk of 

 the wings campanula blue in color, while individuals from the ranges 

 of southeastern Arizona (Huachucas, etc.) have the same area 

 glaucous blue. The difference is quite noticeable when the two types 

 are compared. This species makes at will a clatter similar to that of 

 Circotettix verruculatus. Especially when alarmed its flight is 

 extremely swift and erratic. It was not plentiful along the canyon 

 edge, but lower on the Bright Angel Trail it was found almost every- 

 where, most plentiful, however, about bare places near precipices. 



CIKCOTETTIX Scudder. 

 Circotettix undulatus (Thomas). 



A series of seven males and nine females taken near the rim of the 

 Grand Canyon at Bright Angel represents this species. Two males 

 and three females were taken July 29 to August 2, 1906, by Calvert, and 

 the remainder September 11, 1907, by Hebard. 



The sexes are of practically the same size, and the amount of indi- 

 vidual variation of the same character is slight in a series of thirty-six 

 specimens before us. The general color varies from a decidedly 

 blackish type to one distinctly dull reddish brown in general lone. 



