368 PROCEEDINGS OF THE XATIOXAL MUSEUM. VOL.XX. 



ages and in the tegmiua, besides some distinction in the general 

 coloration. 



The specimens from Grand Junction, Colorado, mentioned above as in 

 B rimer's collection, are short winged and indicate occasional dimorphism 

 in this species. 



127. MELANOPLUS THOMASI, new species. 



(Plate XXV, fig. !.) 

 Melanoplus thomasi BRUNER!, MS. 



Dark plumbeo-olivaceous, the abdomen dark ferruginous. Head 

 marked with flavo- testaceous below and on the inner side of the eyes 

 above, above the antennal scrobes, along the lateral edges of the fron- 

 tal costa, and in a broad stripe behind the upper part of the eyes, which 

 passes backward; vertex gently tumid; interspace between the eyes 

 scarcely narrower than the frontal costa, the fastiginm broadly and 

 rather shallowly sulcate in front, the frontal costa broad, equal, deli- 

 cately punctate, shallowly sulcate at and below the ocellus; eyes mod- 

 erately large, not very prominent, about as long as the infraocular 

 portion of the genae; antennae reddish becoming infuscated apically, 

 a little shorter (male) than the hind femora. Pronotum subequal, 

 enlarging a very little posteriorly, the front margin nearly truncate, 

 the hind margin very broadly angulate, the disk nearly plane, separated 

 by subdistinct but rounded lateral carinae from the subvertical, slightly 

 tumid, lateral lobes, the median carina distinct on the metazona, very 

 feeble on the prozona, the smooth prozona considerably and roundly 

 emarginate in the middle half behind, distinctly longitudinal, nearly a 

 half longer than the closely but shallowly punctate metazona, with a 

 moderately broad, equal, navo-testaceous stripe on either side of the 

 disk of the whole pronotum, limited by the lateral carinae, the Literal 

 lobes nearly uniform dark plumbeo-olivaceous, but deeper in color above 

 than below. Prosternal spine stout, rather long, cylindrical, blunt, 

 enlarging slightly on apical half as seen from the front. Tegmina not 

 reaching the tip of the femora, testaceous with dark veins, a navo- 

 testaceous stripe following the anal vein; wings pellucid, the veins tes- 

 taceous or fusco testaceous, colorless in the lower half of the anal area. 

 Femora dark plumbeo-olivaceous, the hind pair tinged above with fer- 

 ruginous, the lower half of the outer side flavous, the inner and lower 

 face coralline, with a faint pregenicular flavous annulus more or less 

 complete, preceded on the inner side above by a fuscous patch, the 

 genicular arc plumbeo fuscous; hind tibiae wholly coral red, the spines 

 black at the base, eleven in number in the outer series. Extremity of 

 male abdomen somewhat clavate, rounded, a little upturned, the supra- 

 anal plate broad and triangular with sinuate lateral margins, recitan- 

 gulate apex, nearly plane, but with a rather broad and shallow median 

 longitudinal sulcus in the basal half, bordered by rather low walls, and 

 a pair of apical, distant and subparallel, short, gently arcuate, slight 



