ORTHOPTEEA OF INDIANA. 



235 



both the front and hind margins oblique; the former straight, the 

 latter sinuate. Tegmina much longer than the abdomen; acuminate 

 or angulate at apex. Hind femora slender, the apex reaching 

 (female) or exceeding by nearly half their length (male) the abdo- 

 men. But one species belongs to the genus as at present restricted. 



29. Tryxalis brevioornis (Linnaeus). The Short-horned Locust. 

 Gi-yllus {Acrida) brevkornis L., 8 1, II, 1767, 692. 

 TruxaUs brevicnmi.'^ Fabr., 50, 1775, 279; Thorn., 2 11, 1880, 97; 



McN., 8 8, VI, 1891, 66; Id., 8 9, VI, 1897, 211, Plate I, Fig. 



5; BL, 4., XXin, 1891, 75; Id,, 1 1, XXVI, 1894, 221; Id., 15, 



XXX, 1898, 61; Beut., 3, VI, 1894, 291, Plate VIII, Figs. 1, 2. 

 Trij.valis brcnrornis, Burm., 40, II, 1838, 607; Morse, 9 8, VII. 1896, 



325, 382, Plate 7, Figs. A, Aa; Scudd., 188, 1900, 19. 

 Pyrgomorpha brevicomis Glov., 62, 1872, Plate IV, Fig. 14; Thorn., 



206, v., 1873, 67. 

 Opsomala punctipennis Serv., 196, 1838, 590; Tliom., 202, V, 1865, 



447. 

 Pyrijomorpha pimctipennis Thorn., 206, V, 1873, 68. 

 OpomaJa ptinctipennis Thorn., 206, V, 1873, 196. 



The females of this species are dimorphic as regards, color, being 

 either a pale green more or less dotted with brown on the tegmina, 

 or a uniform rusty brown. The green form has the lateral carina 

 of pronotum, antennae and edges of vertex brown. The males, which 



Fig. 43. Tryxalis brevicomis (L.) Female, natural size. (After Beutenmiiller.) 



are much smaller, usually have the dorsal surface, face and tibiae 

 of fore and middle legs, bright green, the remainder of the body dark 

 brown. Inner wings transparent, with the veins greenish. The 

 structural characters are given above under the generic heading. 



Measurements: Length of body, male, 20 mm., female, 33 mm.; 

 of antennae, male, 10 mm., female, 11 mm.; of pronotum, male; 4.5 

 mm., female, 6.5 mm.; of tegmina, male, 20 mm., female, 31 mm.; 

 of hind femora, male, 14 mm., female, 20 mm. 



