198 



FAMILY VI. ACRIDID^J. THE LOCUSTS. 



straight, the latter sinuate; tegmina and wings fully developed, 

 subequal in length; hind femora slender, their tips reaching, 

 female, or exceeding by nearly half their length, male, that of ab- 

 domen; subgenital plate of male conical, scarcely longer than 

 wide at base, its apex acute (Fig. 83, d) ; ovipositor strongly ex- 

 serted. 



But one species is known, the T. angusticornis Stal (1873, 105), 

 described from South Carolina, being a synonym of Dichromor- 

 pli a viridis ( Scudd. ) . 



81. TBYXALIS BKEVICORNIS (Linnaeus), 1764, 398. Short-horned Locust. 



Form rather robust for the tribe, the males much the smaller, more 



compressed. Females dimor- 

 phic as to color, being either 

 pale green with tegmina 

 more or less dotted with 

 brown, or with entire body 

 nearly uniform rusty brown, 

 often with a darker postocu- 

 lar line along head and up- 

 per sides of pronotum; males 

 usually with dorsal surface, 

 face and tibiae of front and 

 middle legs bright green, the 

 other parts pale brown; 

 wings transparent, the veins greenish. Pronotum with lateral caringe 

 slightly cut by all the transverse sulci, disk with hind margin feebly ob- 

 tuse-angulate; metazona three-fourths as long as prozona, its surface 

 rougher. Tegmina and wings more than one-third longer than abdomen, 

 male, but slightly exceeding its tip, female. Length of body, $ , 19 25, 

 9, 32 35; of antennae, $ and 9, 10 11; of pronotum, $, 4.5 5, 9, 

 66.5; of tegmina, $, 2021, 9, 3031; of hind femora, $ , 14, 9 , 20 mm. 

 (Fig. 75.) 



This curious long-headed locust occurs in suitable localities 

 throughout Indiana. It frequents only the tall grasses and sedges 

 along the margins of lakes, ponds, streams and swales, and in 

 such localities is usually locally abundant. In central Indiana it 

 reaches maturity about July 20, and in the northern part of the 

 State a fortnight later. The hind legs are very slender as the in- 

 sect seldom leaps when disturbed, but uses the wings in strong, 

 zig-zag, noiseless flight, usually alighting on a stem of grass or 

 sedge a dozen rods away. Frank Hay, of Bass Lake, Starke Coun- 

 ty, reported a flight of this species after dark on the evening of 

 August 13. Large numbers flew onto his porch and against the 

 house and many were captured and used for fish bait. 



Fig. 75. Female, natural size. (After Beuten- 



nuller.) 



