Bruner: South American Acridoidea. 45 



63. Alcamenes lobipenni? sp. nov. 



Having about the same size and general build as . I . cristatus Bruner, 

 but readily separated from that species by the very strongly lobate 

 anterior border of 1 he much shorter tegmina, and the smaller and less 

 prolonged lasl ventral segment of the male abdomen. 



Head large, fully as wide as the front edge of the pronotum; the 

 occipul and cheeks rounded, the former finely transversely rugose, the 

 latter smooth; eyes prominent, elliptical, a very little narrower above, 

 in the male as long as, and in the female one and one-fourth times the 

 length of the anterior edge of the cheeks below them; fastigium hori- 

 zontal, in the male very gently acuminate, in the female a little obtuse, 

 the disk flat, somewhat rugoso-granulate and provided with a well- 

 defined median carina which continues over the occiput to the ant< ior 

 angle of the pronotum; frontal cost a most prominent above between 

 the base of the antennae and the union with the fastigium, where it is 

 a- narrow as the diameter of the second antennal joint, from this joint 

 evenly divergent below and fading so as to be nearly obliterated 

 before reaching the clypeus, scarcely sulcate. Face shallowly and 

 coarsely punctulate. Pronotum rugoso-granulose, on disk of hind lobe 

 with vien-like raised lines, strongly tectate; the anterior lobe shorter 

 than the posterior one, all three transverse sulci profound, and deeply 

 severing the crest which is smooth, anterior edge slightly acute, the 

 posterior edge very much so; the posterior border of the lateral lobes 

 and the lateral edges of the hind prolongation of disk forming together 

 a continuous arc. Tegmina short, not extending beyond the middle 

 of the third (cf) or the second (9 ) abdominal segment, the basal half 

 of the costal field very strongly lobed, the lower extremity of lobe 

 almost touching the hind coxal scrobe. Abdomen compressed, cari- 

 nate, tapering, the last ventral segment of the male small, compressed, 

 acuminate; supra-anal plate triangularly acuminate, tectate, its 

 middle on basal two-thirds deeply sulcate; cerci small, conical, hir- 

 sute. Posterior femora comparatively slender, very slightly exceed- 

 ing the abdomen in length, their carina' faintly serrate. Antennae 

 robust, the basal joints slightly depressed; in the male as long as, 

 in the female about three-fourths the length of the hind femora. 

 Posterior tibiae eleven-spined on outer margin. Prosternal spine 

 robust, long, the apical half strongly bent to the rear, its apex gently 

 overlapping the front edge of mesosternum. 



General color of typical specimens apple-green, slightly varied b\ 



