OETHOPTEKA OF INDIANA. 249 



Measurements: Length of body, male, 15 mm., female, 30 nmi.; 

 of antennae, male 10 mm., female, 7.5 mm.; of tegmina, male, 9 mm., 

 female, 13 mm.; of hind femora, male, 10.5 mm., female, 11.5 mm. 



This small dull colored locust has been taken in Indiana only from 

 the sandy bed of the old Wabash and Erie Canal, five miles north of 

 Terre Haute, Vigo County. Here it was first taken on July 6, 1893, 

 and afterward in September and October, 1893. On one side of the 

 canal, at the point mentioned, is a large pond, occupying perhaps 

 50 acres of the Wabash Eiver bottoms, and on the other side is a 

 sandy hill or bluff of the river, which is covered with typical prairie 

 grasses and plants. The locust has been found only in an area of 

 about five acres, on the side of the hill, and in the bed of the canal. 

 When disturbed it leaps vigorously, and wifhout noise, for several 

 times in succession; then settling down on a sandy spot, it will allow 

 a close approach, evidently relying upon the similarity of color be- 

 tween its body and the sand to shield it from observation. Accord- 

 ing to Bruner, loc. cit., it is a very common species west of the Mis- 

 sissippi; but east of that stream has been taken only at Moline and 

 Cordova, Illinois; and in Vigo County, this State. It will probably 

 be found to occur over the sand-covered portions of soiithwestern 

 Indiana. 



XXIV. Meuostethus Fieber (1853). 



Vertex horizontal; the lateral carinas distinct, straight, the apex 

 truncate or slightly rounded; median carina distinct; lateral foveolae 

 small, shallow, triangular. Antennse filiform, longer in the male 

 than the head and pronotum together. Pronotum with all the carinae 

 distinct, the median rather sharp, and cut in front of the middle 

 by the principal sulcus; the lateral (in our species) with their pos- 

 terior halves distinctly divergent; the disk rugose, the metazona 

 longer than the prozona; the hind margin of the former obtusely 

 angled. Lateral lobes of pronotum about as high as long, their front 

 margins perpendicular, the hind ones a little oblique, the lower mar- 

 gin with its front half oblique. Tegmina and wings well developed, 

 surpassing the abdomen in both sexes, the discoidal area furnished 

 with a very prominent intercalary vein, which in the male is provided 

 with a rasp for stridulating. Hind femora, rather long and slender, 

 exceeding the abdomen in the male. The sub-anal plate of male is 

 acutely produced, being at least twice as long as its greatest depth. 

 Valves of ovipositor strongly exserted, the upper pair, with minute 

 teeth along their upper margins. 



46— Geol. 



