170 DAVENPORT ACADEMY OF NATURAL SCIENCES. 



Melanoplus immunis sp. nov. 



Of small size and moderately slender, very dark fuscous, ferrugineo- 

 testaceous beneath, with a broad postocular piceous band reaching 

 across the prozona. Head not at all prominent, ferrugineo-testaceous, 

 much infuscated above, the postocular band narrowly edged above 

 with testaceous or ferruginous, at least in the female; vertex gently 

 tumid, feebly elevated above the pronotum, the interspace between 

 the eyes nearly twice as wide as the first antennal joint, especially in 

 the female ; fastigium rather steeply declivent, broadly and shallowly 

 sulcate; frontal costa almost or quite percurrent, subequal but faintly 

 narrowed above, somewhat narrower than the interspace between the 

 eyes, feebly sulcate or depressed at the ocellus, biseriately punctate 

 above; eyes moderate, scarcely more prominent in the male than in 

 the female, a little longer than the infraocular portion of the gense; 

 antennae fusco-rufous, about two-thirds (d^) or three-fifths (+ ) as long 

 as the hind femora. Pronotum subequal but expanding a little on the 

 metazona, dark fuscous, ferrugineo testaceous below the postocular 

 band, the disk gently convex and passing by a more or less distinct 

 angulation, forming tolerably well pronounced lateral carince in the 

 male, into the vertical lateral lobes; median carina feeble on the pro- 

 zona, distinct on the metazona; front and hind margins subtruncate; 

 prozona slightly longitudinal (d") or quadrate (? ), a half longer than 

 the obscurely punctate metazona. Prosternal spine rather large, erect, 

 subconical (c?) or appressed cylindrical (?), blunt; interspace be- 

 tween mesosternal lobes quadrate or a little transverse (cf)or dis- 

 tinctly transverse (9), the metasternal lobes subattingent (c?) or 

 rather distant (? ). Tegmina nearly (c?) or about (?) as long as the 

 pronotum, attingent, obovate, apically rounded, less than twice as long 

 as broad, fuscous. Fore and middle femora slightly tumid in the 

 male, ferruginous, more or less infuscated; hind femora slender, fer- 

 rugineo-testaceous, more or less heavily tinged above with fuscous, 

 beneath flavescent; hind tibiae dull pale ferruginous, more or less 

 lutescent, the spines almost wholly black, 10 (d') or 11 (V) in num- 

 ber in the outer series. Extremity of male abdomen clavate, a little 

 recurved, the supraanal plate simple, triangular, a little acutangulate, 

 pointed, the surface nearly plane but feebly tectate with a deep median 

 sulcus in the basal half; furcula consisting of a pair of slender parallel 

 thorns projecting over the supraanal plate on either side of the median 

 sulcus by no more than the length of the last dorsal segment; cerci 



