236 PROCEEDINGS OF THE NATIONAL MUSEUM. 



black beyond the base, ten to eleven, rarely nine or twelve, in the outer 

 series. Extremity of male abdomen rather strongly clavate, consider- 

 ably recurved, the supraaual plate triangular, with feebly elevated 

 lateral margins and bluntly acutangulate apex, the median sulcns nar- 

 row, deep, and equal, between high but rounded walls, terminating a 

 little beyond the middle of the plate and leaving the tip cochlearate; 

 furcula consisting of a pair of minute slender denticulations overlying 

 the submedian ridges of the supraanal plate; cerci snbequal, tapering 

 in the basal fourth only, beyond enlarged to the slightest degree, gently 

 incurved throughout but otherwise nearly straight, feebly sulcate exte- 

 riorly at the rounded apex, falling well short of the tip of the supra- 

 anal plate; subgenital plate small, narrowed ieebly in the middle of 

 eitlier side, the apical margin gradually and gently elevated, entire, 

 well rounded as seen from above. 



Length of body, male, 20 mm., female, 23 mm.; antennae, female, 

 10.5 mm.; tegmina, male, 7 mm., female, 8.5 mm.; hind femora, male, 

 11 mm., female, 15 mm. 



One male, 7 females. Michigan, M. Miles; Kock Island, Illinois, B. 

 D. Walsh; Dallas County, Iowa, August, J. A. Allen. 



This species was determined in 1805 by the late B. I). Walsh as Fez. 

 scudderi Uhler, described from the same place but quite distinct. It is 

 possible that the two sexes here described belong to two different spe- 

 cies, as there is considerable and unusual difference between them in 

 the shape of the eye and the character of the postocular band; but 

 they agree so well otherwise, and show the same pallid annulus on the 

 hind tibiae, that I regard them as the same. If distinct, the name he: e 

 applied should be given to the female, as only the female was received 

 from Walsh. The male comes from Michigan. 



56. MELANOPLUS ALTITUDINUM. 

 (Plate XVI, fig. 1.) 



Pezotettix marshallU SCUDDER!, Ann. Rep. Chief Eng., 1876 (1876), p. 502; Ann. 



Rep. Geogr. Surv. 100th Mer., 1876 (1876), p. 282. 

 Pezotettix altitudinum SCUDDEK!, Proc. Bost. Soc. Nat. Hist., XX (1879), p. 86; 



Cent. Orth. (1879), p. 75. 

 Pezotettix sanyuinipes BRUNER!, Publ. Nebr. Acad. Sc., Ill (1893), p. 27 undesrr 



Of medium (male) or moderately large (female) size, there being 

 unusual disparity between the sexes, blackish griseons, ferrugineo testa- 

 ceous beneath. Head not prominent, ferrugineo-testaceous below, pa>s 

 ing into blackish fuscous above, with a broad, piceous postocular band ; 

 vertex somewhat tumid, elevated but little above the pronotum, the 

 interspace between the eyes nearly twice (male) or nearly thrice (female) 

 as broad as the first auteuual joint; fastigium not very steeply derli- 

 vent, rather deeply (male) or very shallowly (female) silicate; frontal 

 costa failing to reach the clypeus, equal or subequal, much narrow -r 

 than the interspace between the eyes, silicate at and below the ocellus 

 particularly in the male, punctate throughout like the rest of the face 



