206 PROCEEDINGS OF THE NATIONAL MUSEUM. VOL.XX. 



the frontal costa; the subgeuital plate is small and subconical or sub- 

 pyramidal, the margins lying in one plane and entire. 



Three species are known, two in Arizona, and one from near the 

 margin of the tropics in western Mexico and Lower California. They 

 are rather above the medium and may be of large size. 



37. MELANOPLUS HUMPHREYSII. 



Pezotettix humphreysii THOMAS! (pars), Rep. Geogr. Expl. 100th mer., V (1875), p. 

 890. SCUDDER ! (pars), Proc. Bost. Soc. Nat. Hist., XX, 1879, p. 85; (pars), 

 Cent. Orth. (1879), p. 74. 



The only specimen seen has been in alcohol and the colors are more 

 or less bleached; it is brownish testaceous, marked with black. Head 

 large, somewhat protuberant, without markings except a slender black 

 line behind the eye ; vertex somewhat tumid and a little elevated above 

 the pronotum, sharply punctate except in a posteriorly broadening 

 mesial band which was probably darker colored, the interspace between 

 theeyes much broader (a little distorted in the specimen) than the first 

 an tennal joint ; fastigium rather steeply declivent, rather narrow, sul- 

 cate, biseriately punctate; frontal costa rather prominent above, fading 

 before theclypeus, much broader than the interspace between the eyes, 

 equal, sjiallowly sulcate excepting above, sparsely punctate; eyes of 

 moderate size, not prominent, about as long as the iufraocular portion 

 of the genae; antennae testaceous, apically infuscated, less than two- 

 thirds (female) as long as the hind femora. Pronotum very regularly 

 and feebly enlarging posteriorly, the upper half of the lateral lobes of 

 the prozona with a very large, posteriorly narrowing, piceous patch, 

 nearly split in two subequal portions by a wedge of the basal color 

 extending obliquely upward from the lower anterior corner, and nar- 

 rowly edged above on the disk by a pallid tint; disk transversely con- 

 vex, passing by a very rounded and scarcely perceptible angle into the 

 very steeply declivent and inferiorly vertical lateral lobes, with no lateral 

 carinae; median carina percurrent, feeble on the metazona, coarse and 

 rather prominent on the prozona; front margin truncate but feebly and 

 narrowly flaring; hind margin roundly, broadly and feebly emarginate; 

 disk of prozona very coarsely punctate, quadrate, fully a third as long 

 again as the strongly transverse, finely punctate metazona. Prosternal 

 spine short, conical, blunt; interspace between mesosternal lobes 

 (female) distinctly transverse, narrower than the lobes. Tegmina 

 abbreviate, shorter than the pronotum, lateral, widely separated, 

 enlarging from the base to the middle, beyond equal, apically rounded, 

 several times longer than broad, black on ground with testaceous veins. 

 Hind femora brownish testaceous on upper half, its lower limit infus- 

 cated on the outer face, pallid on lower half, the genicular arc black ; 

 hind tibiae pale testaceous, the spines black tipped, nine to ten in num- 

 ber in the outer series. Supraanal plate of male "bicarinate longitudi- 

 nally"; cerci "flat and enlarged at the base and apex, the apical 



