V °i889."'] PROCEEDINGS OF THE NATIONAL MUSEUM. 75 



lateral lobes with the anterior and posterior edges almost parallel. The 

 lower posterior augle evenly rounded ; first and last transverse im- 

 pressed lines continuous, the latter considerably in advance of the 

 middle; posterior extremity more than a right angle. Tegmina rather 

 broad, and shorter than in the allied forms, reminding one of these 

 members in the genus Circotettix, and especially those of G. rndculatus, 

 not reaching more than one-fifth of their length beyond the tip of the 

 abdomen. Wings nearly as broad as long in some specimens. The 

 radial or anal field full and furnished with strong radial veins, the 

 cross-veins few and quite irregular iu their arrangement. Posterior 

 femora robust, almost reaching the extremity of the abdomen in both 

 sexes. Abdomen a little heavier than usual in members of the genus. 

 Body without the pruiuescens or hairs usual in other species found iu 

 like localities. 



General color light gray, varied and mottled with dull or plain 

 brown ; in some specimens inclining to pale fawn or testaceous. Teg- 

 mina more or less densely mottled with pale brown quadrate spots 

 that show a tendency to congregate into three patches, the one occu- 

 pying the basal third, the second the middle, and the third the outer 

 third of the wing; remainder of wing light gray. Wings without any 

 indication of transverse dusky baud, the basal portion very pale dull 

 yellow, inclining to greenish when seen as folded. The veins and cross- 

 veins of apical half (save near the anterior edge where they are white) 

 dusky. Posterior femora with the usual dusky markings outside, and 

 with inner face and lower sulcus chiefly black ; the posterior tibiae pale 

 greenish yellow with black spines. Antenna? faintly annulate. 



Length of body, $, 25 m,n , 9,30 mn '; of antenna-, $ , 12""", 9, II'"" 1 ; 

 of pronotura, S, 4.85 mm , 9, 6.75 ,,mi ; of tegmina, 5, 23 mi ", 9,28"""; 

 of hind femora, & , 11.5 11 "", 9 , 14.15 mm . 



Described from 4 male and 7 female specimens. 



Hab. — Bad Lands, about five or six miles to the north of Chadron, 

 Nebr., during the month of August (L. Bruuer). 



This peculiar locust, like all of the allied forms, is partial to nearly 

 bare surfaces, and especially to such as have the soil more or less 

 strongly impregnated with alkalies. It is a noisy insect and produces a 

 very decided clatter when upon the wing, showing that it is not distantly 

 removed from the various members of the genus Circotettix, as many 

 of its structural characters would also indicate. 



Circotettix lapidicolus sp. nov. 



Dark grayish brown, profusely mottled with dull black. Wings bot- 

 tle-green without a well-defined dusky band; nerves and cross- veins of 

 apical half more or less infuscated. Posterior tibia? glaucous with light 

 basal aunulus. 



Head of moderate size, the eyes quite prominent, giving the upper 

 portion a square appearance. Vertex between the eyes of moderate 



