Bruner: South American Crickets. 359 



frequented by representatives of both the genera Tridactylus and 

 Rhipipieryx. They seem to be most nearly related to the former, 

 however, and ha\e similar habits. While quite widely distributed 

 over the warmer parts of the Americas, they do not seem to be as well 

 known as the representatives of either of the above mentioned genera. 

 Wherever found they occur rather abundantly. Possibly, if specially 

 sought for, other species would be found. The characters employed 

 in separating the forms are similar to those used in the two other 

 genera just referred to. The following key is suggested as an aid in 

 separating the South American species. 



Synopsis of South American Species of Ellipes. 

 A. Posterior tibiae stronglj^ toothed, the apical spurs hooked; metatarsi present. 



denliculatus Saussure. 

 AA. Posterior tibiae without teeth or spines, the apical spurs variable. 



b. Metatarsi present, but abortive, not conspicuous. Hind tibiae with their 

 margins entire, bearing at the apex one to two movable spines. 



histrio Saussure, 

 hb. Metatarsi none. 



c. Hind tibiae at the apex on each side provided with a carinule which has 

 the appearance of a styliform appendage not separated from the tibiae. 



histrionicus Saussure. 



cc. Hind tibiae at apex without either natatory lamella or attached styliform 



carinules minimus sp. nov. 



13. Ellipes histrio (Saussure). 



Tridactylus (Heleropus) histrio Saussure, Biol. Cent.-Amer., Orth., I (1896^ p. 207. 

 Ellipes histrio Kirby, Syn. Cat. Orth., II (1906), p. 11. 



Habitat. — The present collection contains specimens as follows: 

 Chapada, Brazil, Jan. and May 4; Corumba, May 2 (H. H. Smith 

 collector); Puerto Suarez, Bolivia, 250 M., two (J. Steinbach). 



These insects which are referred here seem to agree fairly well with 

 the description of the species as characterized in the accompanying 

 synoptical key. The movable spines near the apex of the hind tibiae, 

 one on one side and two on the other, are quite characteristic of it, as 

 compared with representatives of the next species, which is entirely 

 without either the spines or the natatory lamellae, as well as the carinae 

 described in connection with the apex of the tibiae of E. histrionicus. 



14. Ellipes minimus sp. nov. 

 Related to E. histrionicus, but difl'ering from it in lacking even the 

 styliform attached carinae, which characterize that species, when com- 



