220 THE CANADIAN ENTOMOLOGIST. 



In Indiana this grouse locust is much less common than T. or?iaius, 

 Say, with which species it has been confounded by many writers. Bur- 

 meister's description was so short and unsatisfactory that unless one 

 could examine his types it is impossible to determine what species he had 

 at hand. 



Bolivar, in his " Essai," separates the group containing orfiatus from 

 that containing arenosus by the difference in the relative length of the 

 pronotum, but collectors of these insects know that this character is of 

 little value on account of its great variation in the same species. More- 

 over, he gives the length of pronotum oi orriatus as 7 5-9 mm., and states 

 that it does not exceed the tip of the posterior femora. A glance at 

 Say's description and figure will show that he was wrong concerning both 

 of these points, as the length of pronotum there, and the average length 

 in many specimens at hand, is about 11.5 mm. 



Arenosus, as I have it separated in my collection, is a somewhat 

 shorter and broader species than ortiaius, and with the median carina of 

 the pronotum and vertex much more distinct. The granulations on the 

 pronotum are longer and more irregularly distributed, and, especially on 

 the posterior half, have a tendency to arrangement in short, oblique waves 

 or ridges, while the median sulcus of the face is wider in its lower half 

 than in ornatus. 



The general colour o{ arenosus is darker and the annulations of the 

 antennae and legs are much more distinct than in ornatus, which in colour 

 is an exceedingly variable insect. But little practice is necessary to 

 quickly distinguish the two species in the field. 



Arenosus in this vicinity is found in small numbers about gravelly 

 hillsides, and occasionally in company with T. cucullatus about the 

 borders of streams, while ornatus is a very common species in dry upland 

 woods. 

 5. Tettix granulatus (Kirby). 



Acridium granulatu/n, Kirby, "Fauna Bor. Am., IV., 1837, 251." 

 7>///A:^/-d!««/fl/«5,Scudder,Bost. Journ. Nat. Hist.,VII., 1862, 474. 

 Thomas, Syn. Acrid. N.A., 1873, 182, 

 Bethune, Can. Ent. VII., 1875, 130. (Copy 



of Orig. Desc.) 

 Riley, Rep. U, S. Ent. Comm., I., 1877, 256, 



fig, II. 

 Bolivar, Essai Sur. les Tettig , 1887. 91. 

 McNeill, Psyche, VI., 1891, 77. 



