135 



25. Oechelimum xig rites, Scudder. The Black-legged Grasshopper. 



Orchelimum nigripes, Scudder, Proc. Bost. Soc. Nat. Hist., XVII., 1875, 

 459. 



Id., Entom. Notes, IV., 1875, 62. 



Id., Cent. Orthop., 1879, 12. 



Id., Rep. Ent. Soc. Ont., XXIII., 1892, 73. 



Bruner, Bull, Washb., Coll. Lab. Nat. Hist., I., 

 1885, 128. 



McNeill, Psyche, VI., 1891, 25. 



Redtenbacher, Monog. der Conoceph., 1891, 188. 



Osborne, Proc. la. Acad. Sci., I., 1892, 118. 



Blatchley, Canad. Ent., XXV., 1S93, 93. 

 Somewhat smaller than 0. ndgare ; the body moderately robust. Pro- 

 notum short, the posterior lobe, especially in the male, rather strongly 

 upturned. Tegmina a little shorter than the wings, surpassing slightly 

 the hind femora. The shrilling organ of the male is unusually large and 

 prominent with strong cross veins, and behind it the tegmina taper rap- 

 idly on both margins ; their shape and the size of the tympanum causing 

 the male to appear somewhat peculiar and much more robust than it 

 really is. Hind femora armed on apical half of lower outer carina with 

 from one to four small spines. Cerci of male slender, tapering, the apex 

 a little obtuse; the sub-basal tooth long, slender and a little curved. 

 Ovipositor rather long, broadest in the middle, tapering to a delicate point. 

 The males vary much in size. General color green or reddish-brown, the 

 former prevailing in the male, the latter in the female. Occiput and disk 

 of pronotum with the usual brown markings. Front and sides of head, 

 and four front femora, reddish yellow. All the tibiae and tarsi, together 

 with the apical third of hind femora, black or dark brown ; in one speci- 

 men at hand the whole body, except the wing-covers and femora, black. 



Measurements: Male — Length of body, 18 mm.; of pronotum, 5 mm.; 

 of tegmina, 21 mm.; of hind femora, 16 mm. Female — Length of body, 

 19 mm.; of tegmina, 22 mm.; of hind femora, 17 mm.; of ovipositor, 9 mm. 

 A lowland species, which, in Vigo county, is excessively common from 

 August 1st to October 15th, about the river bottom ponds mentioned 

 above, where it frequents the stems and leaves of the different species of 

 Polygonum, or smart weed, growing in the shallow water. A few specimens 

 have been taken in Putnam county, and a single male from the margin of 

 a tamarack swamp at Kewanna, Fulton county, so that it probably occurs 



