ORTHOPTEEA OF INDIANA. 225 



readily known hj its more slender form, flatter pronotmn with less 

 prominent median carina, and by its evenly and finely granulated sur- 

 face. The annulations of antennae and legs are much less distinct 

 than in ornatus and the general color is not so variable. It frequents 

 upland Avoods which are dry and open, being seldom found in the 

 vicinity of Avater. It Avas originally described from South Carolina, 

 and its general range is southern. 



22. Tettix obscurus Hancock; The Obscure Grouse Locust. 



Tctfix obscunifi Hanc, 6 7, XXIII, 189fi, 239, Plate VII, Figs. 9, 9a, 10, 



10a; Plate IX, Figs. 23, 25; Id., 69, 1902, 87; Scudd., 188, 



1900, 17. 

 Ti'ffi.r injlatti>< Hauc, 6 7, XXIII, 1896, 238; Scudd., 18 8, 1900, 17. 

 Tettix anyaUns Hauc, 6 7, XXIII, 1896, 238; Scudd., 18 8, 1900, 16. 



Allied to arenosus, Avith which it agrees in color; body more robust. 

 Vertex, AdcAved from above, twice the width of one of the eyes, but 

 little depressed in front; extending beyond the front of eyes to' a dis- 

 tance equal to one-fourth the diameter of one of them; its median 

 carina but little distinct, not advanced beyond the sides. Frontal 

 costa distinctl}'' sinuate betAveen the lower portions of the eyes, form- 

 ing a small protuberance at the junction Avith the median carina of 

 the vertex. Eyes of medium size. Prouotum truncate in front, 

 strongly constricted before the shoulders, less prolonged backward 

 than in arenosus; the median carina indistinct through most of its 

 length, a little raised on anterior third. Inner Avings extending 

 slightly beyond tip of pronotmn. 



Measurements: Length of body, male, 11 mm., female, 13 mm.; of 

 pronotum, male, 10.5 mm., female, 12 mm.; of hind femora, male, 5 

 mm., female, 5.5 mm. 



Among a number of grouse locusts sent to Dr. Hancock Avcre nu- 

 merous examples from Vigo, Marion and Lake counties Avhich he re- 

 ferred to this species. They Avere taken in company with T. arenosus 

 and Avere by me considered that species. In my opinion time Avill 

 show that obscurus is but a form of arenosus, as Dr. Hancock wrote 

 me, when returning the specimens, that some of those labeled by him 

 as obscurus "shade off into forms approaching arenosus." 



Hancock^s T. gibbosus, representatives of which he also found 

 among the "lot of arenosus" I sent him from Vigo and Marion 

 counties, I consider only a shorter and wider form of arenosus, having 

 the pronotum a little more constricted than usual in front of the 

 shoulders. The other characters given by him in his key to the spe- 

 cies of Tettix are not distinctive. 



