462 PROCEEDINGS OF THE ACADEMY OF [Oct., 



before us are typical. Measurements of the extremes of the series 

 in hand are as follows : 



mm. 



Length of body, 13 



Length of pronotum, . . . 2.5 



Length of tegmen, 12.3 



Length of caudal ferum, . . . 8.9 



Specimens examined by the senior author 15 from Bill Williams Fork, 

 Arizona, were also noted as being larger than the type measurements. 



The coloration varies chiefly in the depth of the buffy base color, 

 some individuals having considerable reddish, chiefly on the proximal 

 portion of the tegmina and the disk of the metazona. The femoral 

 bars are decidedly marked in all the specimens. 



The specimens were all collected among dry grass growing in deep 

 sand near the border of a borax flat. Nowhere else was the species 

 to be found, but in this location it was plentiful. The species has a 

 quick short flight, and when resting on the sand often appears to rely 

 on its protective coloration. The situation in which the specimens 

 were taken was frightfully hot. 



The species is only known from Palm Springs, Colorado Desert, 

 California, Bill Williams Fork, Arizona, and foothills of the Bird 

 Spring Mountains, near the California-Nevada boundary. 

 Tytthotyle maoulata (Brunei-). 



This peculiar locust was taken at three localities, and in every in- 

 stance it frequented volcanic rock fragments, flying long distances, 

 somewhat like species of the genus Schistocerca, alighting precipitately 

 on the bare volcanic rocks, and almost invariably climbing upon one 

 of the higher fragments. The insects were, however, easily approached 

 when due caution was used. 



The series comprises six males and two females, taken as follows: 

 Kelso, August 12, one male; North Range, Providence Mountains, 

 August 12, one male, one female; foothills Bird Spring Mountains, 

 August 11, four males, one female, specimens being taken in both 

 California and Nevada. 



In size the specimens exhibit but slight variation, but in color the 

 prevailing tone is pinkish-brown in some specimens and drab-gray 

 in others, the maculations being variable in intensity and pattern. 

 The caudal angle of the disk of the pronotum varies from rectangulate 



15 Trans. Kansas Acad. Sci., XIX, p. 224. 



