12 Annals of the Carnegie Museum. 



d. Size smaller (cf. 12-13 mm., 9, 15-18 mm.). 



e. Form graceful, size smaller (,cf. 12 mm., 9. 16. 5-17 mm.) [Isle 



of Trinidad to northern Brazil.] chipmani Bruner. 



ee. Form more robust, size larger (cf, 13 mm., 9, 17-18 mm.). 



[Central Peru.] peruna Bruner. 



dd. Size larger (d\ 15 mm., 9, 23-25 mm.). [Cuba and Isle of Pines.] 



scudderi Bolivar. 



bb. Body robust, strongly compressed, making the insect appear unusually deep. 



c. Lateral carina' of pronotum in advance of last transverse sulcus straight- 



parallel. Antenna? heavy, the basal joints strongly depressed. 



crassa sp. nov. 



cc. Lateral carina? of pronotum in advance of the last transverse sulcus more 



or less strongly arcuate. Antennae comparatively slender, the 



basal joints but little flattened. 



d. Lateral foveolae of vertex shallow, elongate- triangular; hind femora 



with the apex normal, moderately robust grossa sp. nov. 



dd. Lateral foveolae of vertex rather deep, basal width one-half the length ; 

 hind femora with the apex small, unusually slender. 



compacta sp. nov. 



7. Orphulella obscura Bruner. 



Orphulella obscura Bruner, Proc. L T . S. Nat. Mus., XXX, p. 627 (1906). 



Habitat. — Chapada, Corumba, and Para, Brazil, from April to 

 September. Several specimens of both sexes (H. H. Smith). 



This insect is very variable in color, but in every case is quite 

 readily recognizable on account of the rather heavy fuscous markings 

 of the pronotum, tegmina, and legs. It does not appear to be as 

 common as some of the other species of the genus, or else its habits 

 are of such a nature as to render it less liable to detection and capture. 



8. Orphulella interrupta sp. nov. 



This locust, as shown by the above synoptic table of the South 

 American species of the genus, is most closely related to 0. obscura 

 and 0. gracilis, both of which it approaches in having the lateral 

 carina; of the pronotum interrupted between the sulci. From the 

 former it may readily be separated by the slightly larger size and the 

 form of the separate sections of the carina?; from the latter by its 

 much larger size and the more robust hind femora. Antennae short, 

 the proximal joints a little flattened. 



General form somewhat robust; the head large, a little wider than 

 the front edge of the pronotum, the occiput very gently arcuate when 

 \ iewed laterally, the vertex somewhat ascending, rather deeply sulcate, 

 nearly twice as broad as long, the antero-lateral carina? meeting in an 



