AGENEOTETTIX. 109 



grasshoppers in most localities. They are especially partial to the short grass-covered 

 hill-sides and plains between the Missouri River and the Rocky Mountains, but also 

 occur almost or quite across the continent to the Pacific southward. While their 

 distribution seems to be chiefly northward, at least two of them belong to the region 

 here under consideration. Besides these two species, the others are included in the 

 subjoined table, as they, too, may eventually be found to occur within the Mexican 

 border. 



Table for separating the Species of Ageneotettix. 



A 1 . Normally with the tegmina and wings not shorter than the 

 abdomen. 

 b\ Larger. The fastigium in the male forming a right angle, or 

 a little obtuse. 

 c 1 . Hind tibiae with ten or eleven spines on the outer row. 



Wings slightly surpassing the abdomen in the male ... 1. scudderi, Bruner. 

 c 2 . Hind tibiae with nine spines in the outer row. Wings not 



surpassing the tip of the abdomen in either sex .... 3. australis, sp. n. 

 6*. Smaller. The fastigium of the male slightly acute-angled. 

 The tegmina and wings about as long as the abdomen in both 

 sexes 2. deorum, Scudd. 



A\ Normally with the tegmina and wings considerably, sometimes 

 greatly, abbreviated in both sexes. 

 b\ Tegmina greatly abbreviated, about one-third the length of the 

 abdomen. Hind tibiae coral-red, and with only a narrow sub- 

 basal pale annulus. (Southern Colorado.) [curtipennis, sp. n.] 



b*. Tegmina moderately abbreviated, from one-half to two-thirds 

 as long as the abdomen. Hind tibiae usually rather pale red 

 apically, the basal third (except the knee, which is black) 

 testaceous. (South-western Colorado.) [4. occidentals * Bruner.] 



l. Ageneotettix scudderi, Bruner. 



Aulocara scudderi, Bruner, Proc. U.S. Nat. Mus. xii. pp. 63, 64 (1890) \ 

 Eremnus scudderi, McNeill, Proc. Dav. Acad. Nat. Sci. vi. pp. 268, 269 (1897) 2 . 

 PhUbostroma parvus, McNeill, Psyche, vi. p. 64 (1891) 3 . 

 Hab. Noeth America, from the Saskatchewan River to Texas and New Mexico 1_3 . 



While no definite records of the capture of this form in Mexican territory seem to 

 be extant, its known wide range, together with the fact that a similar species was 

 observed though not taken in Northern Chihuahua by the present writer, would permit 

 of its being included here. 



* Described in a paper on Colorado Orthoptera which is shortly to be published by the Agricultural 

 Experiment Station of that State. 



