Bruner: South American Crickets. 361 



Most of the species of the genus are confined to South American 

 countries, where representatives of the group may be looked for at 

 suitable localities from ocean to ocean and from the Isthmus of Panama 

 to Bolivia, Paraguay, and northern Argentina. Since practically all 

 of the described forms are from this continent, they will be included 

 in the annexed synoptical key, which is given for the purpose of show- 

 ing the relationships of the new forms described herewith. 



So far as known the coloration and size of the different species are 

 fairly constant, hence these characters will be largely employed in 

 their separation. 



Synopsis of the Species of Rhipipteryx. 



A. Larger species (9-14 mm. including wings). 



b. Entirely black, the claws of the hind tibiae also black. 



c. Antennae with the sixth antennal joint above yellowish white. 

 d. Length of the body to tip of the wings 9.2 mm. [Panama, on Volcano 



Chiiique] carbonaria Saussiire. 



dd. Length of body including the wings only 8 mm. [Bogota]. 



alra Serville. 

 cc. Antennae with most, or at least the apical, joints pallid in color. Meta- 

 tarsus and claws unequal in length. 

 d. Three apical joints of the antennae pallid, the remaining joints black, 

 or infuscated. Length of the body including the wings 13 mm. 



[U. S. of Colombia] forceps Saussure. 



dd. Two apical joints black, the remaining joints pallid. Length(?). 



[Department of Santa Cruz, Bolivia.] sp. nov. 



bb. Variegated with yellow or rufous. Claws of the hind tibiae pallid. 



c. Disc of the pronotum immaculate, not marked with yellow or dirty white. 

 d. Size smaller (10.5 mm. including the wings). First four of the an- 

 tennal joints above pallid, the apical joint entirely and the pen- 

 ultimate one partly so. Metatarsus of the hind tibiae of equal 

 length with the claws. [Guiana, Brazil, and Central America]. 



limbala Burmeister. 

 dd. Size larger (11. 5-14 mm.). Metatarsi shorter than the claws. 



e. Scutellum of the face flavo-bimaculate. Anterior and middle 



femora broadly bordered with, or entirely, flavous. Hind 



femora not bordered above with yellow. Size 11.5 mm. to tip 



of wings. [Nicaragua and S. America]., .hydrodroma Saussure. 



ee. Scutellum of the face immaculate. Anterior femora entirely 



black, middle pair bordered below, hind femora bordered both 



above and below, with flavous. Size 12.5 mm. to 14 mm. to 



tip of the wings. [Tropical America] . . . .circumcincta Saussure. 



cc. Disc of the pronotum largely pallid, or at least marked with this color. 



d. Pronotum for the most pait pallid, or with the disc conspicuously 



dotted and marked with black. 



