ARNILIA.— INUSIA. 259 



One male and four females. This insect almost certainly reaches far enough along 

 the isthmus, northward, to be included in the Central- American fauna. It has a 

 decidedly inflated fastigium of the vertex, that is also sulcate longitudinally, and the 

 prosternal spine is long, coarse, and blunt at its apex. 



INUSIA, Giglio-Tos. 



Inusia, Giglio-Tos, Boll. Mus. Zool. Anat. Comp. Torino, xii. no. 302, p. 30 (1897); xiii. no. 311, 

 p. 44 (1898) ; Bruner, Journ. N. York Ent. Soc. xiv. p. 151 (1906). 



The present genus is composed of several species of nearly related, medium-sized, 

 tropical locusts. Their general colour is brownish above and greenish-yellow below. 

 They are found in low swampy places at the margins of groves or forests. The type 

 of Inusia is /. gracillima of Giglio-Tos. The various forms may be separated by the 

 accompanying table ; — 



Synopsis of the Species of Inusia. 



A 1 . Form very slender. [South- American species.] 



b 1 . General colour above fusco-olivaceous inclining to ferruginous, the 

 middle of sides o£ head, pronotum, and pleura longitudinally 

 marked by a yellow line. Posterior tibiae 6-spined externally. 



[South-east Bolivia.] [gracillima, Gig.-Tos.] 



b 2 . General colour above pale green ; the sides of head, pronotum, 

 and pleura longitudinally marked by an obscure piceous band. 



Posterior tibiae 7-spined externally. [Paraguay.] [pallida, Bruner.] 



A\ Form more robust. [Middle and Northern South America.] 



b r . Discal area of tegmina provided with two more or less well-defined 

 intercalary veins. 

 c 1 . Smaller (length, <J 18, ? 24 mm.). The tegmina with their 

 apex rather bluntly rounded, and extending but little beyond 



the tip of the hind femora. [Costa Rica.] 1. nana, sp. n. 



c\ Larger (length, <J 22, ? 24-26 mm.). The tegmina more 

 acuminate and extending fully one-fifth of their length beyond 

 the tip of the hind femora. [Brazil, Guiana, Trinidad.] 

 d\ More robust and slightly larger (length, $ , 29 mm. to tip 



of tegmina). [Rio de Janeiro.] [janeirensis, sp. n.] 



d 2 . More slender and slightly smaller (length, <J, 27 mm. to tip 



of tegmina). [British Guiana and Trinidad.] [2. chipmani, Bruner.] 



b 1 . Discal area of tegmina provided with three more or less apparent 

 intercalary veins. 

 c l . Hind femora with their knees marked internally with dark 



brown or black. [Northern Mexico to Costa Rica.] .... 3. bicolor, sp. n. 

 c~. Hind femora with their knees at most only tinged with pale 



ferruginous. [Province of Vera Cruz, Mexico.] 4. inornatipes, sp. n. 



2Ll2 



