1918.] NATURAL SCIENCES OF PHILADELPHIA. 193 



thickly plumose proximal section of the antennae, in the more promi- 

 nent eyes, in the more slender limbs and in features of the coloration 

 which need not be emphasized on account of color variability in the 

 genus. 



Walker's Aganacris micans^^ may be related, but the description 

 does not mention the peculiar hyaline character of the tegmina and 

 Avings, the former of which is said to be black with a cupreous tinge, 

 the latter blackish. 



Type: cf ; Igarape-assu, State of Para, Brazil. (H. S. Parish.) 

 [Acad. Nat. Sci. Phila., Type no. 5303.] 



Size medium: form compressed: surface highly polished, the head, 

 ventral portion of the lateral lobes of the pronotum, venter, apex of 

 abdomen and limbs with a greater or lesser amount of whitish pile. 

 Head with the occiput rather strongly inflated, moderately declivent 

 to the fastigium: fastigium but slightly produced, subcompressed, 

 strongly declivent, acuminate when seen from the dorsum, the apex 

 narrowly but strongly rounded, strongly sulcate, ventrad rather 

 broadly in contact with the slightly acute fastigium of the face: 

 median ocellus large; lateral ocelli large, ovate, separated by the 

 fastigium alone: palpi elongate, slender, fifth joint slightly more than 

 half again as long as the third joint: eyes large, prominent, ovate in 

 basal outline, their depth about twice that of the infra-ocular portion 

 of the genae: antennae incomplete, proximad moderately plumose. 

 Pronotum short sellate, with the peculiar structural details found in 

 S. nitida, when seen from the side the dorsum is strongly concave in 

 cephalic half and deplanate caudad: greatest (caudal) width of the 

 disk equal to about four-fifths the greatest length of the same; ceph- 

 alic margin of the disk subtruncate, caudal margin strongly arcuate: 

 transverse impression broad, rounded, its center at about cephalic 

 fourth: lateral portions of disk in cephalic half strongly rounded into 

 the lobes, caudad are present distinct angles, which are chrected meso- 

 cephalad, these passing into the rounded portion; metazona of disk 

 slightly impressed: lateral lobes of the pronotum with the greatest 

 depth one and one-half times in the greatest length of the same; the 

 transverse impression of the dorsum strongly continued on the lateral 

 lobes, caudad of which the surface is somewhat bullate; cephalic 

 margin of the lobes sigmoid, concave dorsad, convex ventrad, ventro- 

 cephalic angle rounded obtuse, ventral margin arcuate oblique, ven- 

 tro-caudal margin very broadly rounded, caudal margin slightly 



54 Catal. Dermap. Salt. Brit. Mus., V, p. 41, (1871). 



