Bruner: South American Acridoidea. 79 



above. Legs and under side greenish flavous; hind tibia amber- 

 yellow, twelve- to fourteen-spined on outer edge. 



Length of body, d", 28-30 mm., 9, 37 mm.; of pronotum, cf, 4.6 

 mm., 9, 5-9 mm.; of tegmina, o 71 , 23-27 mm., 9, 32 mm.; of hind 

 femora, d\ 12-12. 5 nun., 9, 15 mm. 



Habitat. — The collection contains three males and one female speci- 

 men oi this insect, which were collected at Corumba, Brazil, three of 

 them were taken during March and the other during July (II. II. 

 Smith). Type in the Carnegie Museum. 



There are two male specimens of another species of the genus at 

 hand which were taken below Asuncion on the Rio Paraguay. I 

 have referred them to L. rosea Giglio-Tos with some doubt, as they 

 are perceptibly larger than the measurements given for that species. 

 In structure these latter specimens (cf ) are about as robust and nearly 

 as large as the females of gracilis just described. They have been 

 temporarily labeled as Leptysmina tenuipennis sp. nov. 



Genus Stenacris Walker. 



Stenacris Walker, Cat. Dermapt. Salt. Brit. Mus., IV, p. 651 (1870). 

 Arnilia Stal, Recens. Orthopt., I, pp. 42, 85 (1873). 



This is still another of the genera of the subaquatic locusts belonging 



to America. The various forms are all tropical, or subtropical, in their 



distribution. Seven distinct species are credited to South America 



by Kirby. Only one of these has been recognized among the material 



at hand. 



113. Stenacris gracilis (Giglio-Tos). 



Arnilia gracilis Giglio-Tos, Boll. Mus. Zool. Anat. Torino, XII, no. 302, p. 30 

 (1897)- 

 Habitat. — Corumba, Brazil, lowlands, during March and December 



(II. H. Smith). 



Genus Opsomai.a (Serville). 



Opshomala Serville, Ann. Sci. Nat., XXII, p. 267 (1831). 

 Opsomala Burmeister, Handb. Ent., II, p. 610 (1838). 

 Opomala Agassiz, Xomencl. Zool. Ind. Univ., p. 262 (1846). 

 Chrostheipus Bolivar, Ann. Mus. Genova, XXXIII, p. 137 (1893). 



The insects which Kirby separates under the present generic name 

 resemble those belonging to Stenacris Walker, but have a less com- 

 plicated structure of the last ventral segment, or subanal plate, of the 

 male abdomen. They too belong to tropical America, and all but 

 one are confined to the South American continent. 



