800 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxvi. 



above with a scarcely discernible trace of a postocular band, though 

 with more specimens there would i)r()l)a))ly be some variation in this 

 respect. The vertex is tumid and slig-htl}' elevated above the thorax: 

 interspace between the eyes about as broad as the Ijasal segment of 

 the anteniKc: frontal costa subequal, flat, biseriately punctate above 

 the ocellus, below shallowly sulcate, just failing to reach the clypeus; 

 eyes moderately prominent, a little longer than the infracular part of 

 the gena?; antenna^ flavo-testaceous, about three-fourths as long as thei 

 posterior femora. Pronotum very slightly enlarging from in front ' 

 backward, the carina^ as in 31. i^^opinquus; color testaceous with u 

 black postocular band on the prozona, not extending onto the meta- 

 zona; front margin truncate, scarcely at all flaring, hind margin 

 obtusangulate. Prosternal spine and mesosternal foramine as in 

 proplnquK^. Tegmina considerably passing the posterior femora, i 

 ver}' slender in form and uniformly testaceous, immaculate. Fore and <■ 

 middle femora considerably swollen, hind femora very pale testaceous i 

 above, paler below, without })ands, but with black genicular arcs. 

 Posterior tibise uniformly red, spines wholh^ black, eleven in number 

 in the outer series. Extremity of abdomen quite noticeably clavate, 

 moderateh' recurved, the supraanal plate strongly depressed apically, 

 almost hidden by the more than usuul developed pallium, lateral mar- 

 gins moderately elevated, median sulcus moderateh' deep with narrow, 

 elevated margins; furcula two-thirds as long as the supraanal plate, 

 broad and touching at the base for a third of their length and quite 

 thin, narrowing abruptly to half their basal width and continuing as i 

 C3dindrical oval terminating fingers, slightly curving inward; cerci 

 relatively broader than those of pr(>pin<iuu)i., tapering more on the 

 upper side than on the lower and obliquely truncate apically, the upper 

 edge of the apex blunth" acute; subgenital plate as in proplnquus. 



Length of body from head to tip of the abdomen, 21 mm., antennae, 

 8 mm., elytra, 18 mm., hind femora, 12 mm. 



Type.—^o. 6599, U.S.N.M. 



The broader cerci, pallid lower surface of the posterior femora, and 

 the habitat will serve to separate this species from its nearest ally, 

 M. proplnquus. It belongs to the femur rubrum series. 



104. MELANOPLUS DIFFERENTIALIS Thomas. 



Arridium differentialis Thomas, Trans. 111. 8t. Agrie. 80c., V, 1865, j*. 450. 



Many, specimens at Victoria, Texas in June and July and on both 

 sides of the divide in Colorado. At Grand Junction I took a number 

 of fine large specimens of both sexes on August IT that were uni- 

 formly brownish in color and very large. In Texas they were very 

 numerous along roadsides in rank weeds, flying up in swarms at the 

 approach of the buggy. In the streets of Denver black individuals 

 were taken on several occasions. 



