Scudder. ] 76 [November 6, 
along the eastern base of the Rocky Mts. in Colorado, and did not 
occur about Green River City in Wyoming Territory. But it also 
extends farther north than Mr. Thomas indicates in the place above 
referred to, for I have specimens taken by Mr. E. P. Austin on the 
southern Black Hills; by some of the R. R. Surveys between Ft. 
Union and Ft. Benton on the upper Missouri; and by Gen. Sully in 
his explorations in Dacota, at what precise point is not indicated. 
P. variegatus on the other hand has been taken at San Diego, Cali- 
fornia, by Dr. Edward Palmer, in Sonora by Mr. Schott, during the 
exploration of the Mexican Boundary Survey; and in Southern Ari- 
zona by Dr. Palmer, at Fts. Whipple and Buchanan and at a point 
forty miles east of Tucson. This is the first instance recorded of 
the occurrence of this group of Pezotettix upon the western side 
of the Rocky Mts. 
82. Pezotettix dumicolus. Vertex between the eyes very 
narrow, scarcely equalling the width of the first antennal joint; fove- 
ola shallow, slender, subspatulate, with rather coarse bounding walls; 
frontal ridge moderate, equal, excepting in being very slightly and 
roundly contracted at the summit, sulcate at the ocellus and below it. 
Prothorax very simple, uniformly and slightly expanding posteriorly 
the front border straight or scarcely convex, the hind border slightly 
_and broadly emarginate in the middle; the lateral carinzee completely 
obsolete and uniform, the disc passing imperceptibly into the de- 
flected lobes; the median carina faint, very blunt, equal through- 
out; the anterior lobe is sparsely and rather faintly punctate, the 
posterior more distinctly and abundantly, but with minuter punc- 
te. Tegmina lateral, minute, considerably shorter than the protho- 
rax, bluntly rounded at tip, the inner margin nearly straight, the 
costal very convex, the whole twice as long as the extreme breadth. 
Last ventral segment of ¢ abdomen quadrate, tumid, the upper (pos- 
terior) edge semicircular, entire, and projecting over it a backward 
directed, stout, sub-depressed, blunt process, taking the place of 
the membrane which usually covers the semicircle in Pezotettigi; su- 
praanal plate triangular, a very little longer than broad, the sides 
nearly straight, the extreme tip blunt; the marginal apophyses of the 
preceding segment reduced to a broad lamellate triangular tooth, its 
angle projecting but little at the middle of either half of the supra- 
anal plate; anal cerci broad, compressed-laminate, subequal but 
somewhat and broadly constricted in the middle, straight and direct- 
ed upward, the apical half also curved inward, the apex excised, 
