SUBFAMILY I. TETRIGIN.15. 169 



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Common throughout southern Indiana, Kosciusko county only 

 in the northern portion; April Oct. 4. Leon County and Jack- 

 sonville, Fla., February April (R. & H., 1904). Ranges from In- 

 diana and Virginia west and south to Nebraska, Louisiana and 

 Texas. Common throughout the southern States except peninsu- 

 lar Florida, where it is replaced by the race bltitdilci/i. In Indiana 

 it frequents upland woods which are dry and open, being seldom 

 found in the vicinity of water. Elsewhere it is said to occur 

 mainly on sandy loams in company with other xerophilous species 

 of the family. From A. onmtuin it may be easily separated by 

 its more slender form, flatter and less projecting parallel-sided 

 vertex, more depressed prouotum with less prominent median 

 carina, and by its evenly and finely granulated surface. The 

 aunulations of antenna? and legs are much less distinct than in 

 oniatinn and the general color is not so variable. A short form 

 is known but is very scarce. 

 G9a. ACRYDIUJI ARENOSUM OBSCURUM (Hancock), 1896, 239. Obscure 



Grouse Locust. 



A form or variety of arenosum with which it agrees in color. Distin- 

 guished by the slightly larger size, with vertex less depressed in front; 

 frontal costa in profile more projecting beyond the eyes, the sinuation 

 more distinct between their lower portion, viewed in front the costa more 

 appreciably furcate. Eyes smaller. Pronotum strongly constricted before 

 the shoulders, less prolonged backward than in arenosum; the median 

 carina indistinct through most of its length, a little raised on anterior 

 third. Tegmina more elongate. Inner wings extending slightly beyond 

 tip of pronotum. Length of body, <J , 11 11.7, 9, 13 13.9; of pronotum, 

 $, 9.811, $, 11.513; of hind femora, $, 4.55.2, 5, 5.5 mm. (Fig. 62.) 



Vigo, Marion and Lake counties, Indiana, Apr. 6 Nov. 7. 

 Range in general more northern than that of typical arenosum, 



extending through the upper Carolinian and 

 Transition zones in eastern North America 

 or from Truro, Nova Scotia, DeGrassi Point, 

 Out., and eastern Maine, west to St. Anthony 

 Park, Minn., and Nebraska, south to Mary- 

 land, Virginia, northern Georgia, Missouri 

 and Kansas. Intel-grades with typical areno- 

 sum in the southern part of its range, and 

 very close to it wherever found. In Indiana it 

 occurs with ctraiosiuu, and Hancock wrote me 

 when returning some specimens, that some of 

 them labelled b him as ohscnnnn- ''shade off 



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