Bri ner : South Ami ri< w i ,i h i jts. 505 



their structure, thai no attempt has thus far been made to make a 

 synoptical key for their separation. 



127. Osmilia flavolineata (De ( ieei I. 

 Acrydium flavolineatum 1m <.i er, M6m. Ins., Ill, p. 497, No. [3, pi. 42, fig. 4 



Hum flavolineatum Bi rmeister, Handb. Int.. II, p. 634, No. 20 (1838). 

 Acridium (Osmilia) flavolineatum StAl, Recens. Orthopt., I, p. 68, No. 18 (1873). 

 Osmilia flavolineatum Bri'nkr, Biol. Cent.-Amer., Orthopt., pp. 330, 331 (1908). 



Habitat. — A pair, male and female, coming from Bogota, Colombia, 

 are placed here. They form pan of accession number 2306. 



128. Osmilia violacea (Thunberg)? 



Cryllus violaceus Thunberg, M6m. Acad. Petersb., IX, pp. 396, 413 (1824). 

 Acridium (Osmilia) violaceum StAl, Recens. Orthopt., I, p. 68, No. 19 (1873). 

 Osmilia violacea Giglio-Tos, Boll. Mus. Zool. Anat. Comp. Torino, IX, No. 184, 

 p. 18 (1894). 



Habitat. — There are two males and six females of this genus before 

 me that come from Santa Cruz de la Sierra, Bolivia, Paraguay, and 

 several Brazilian localities. Although Kirby has included my former 

 references to violacea among his synonymy of the previous species, 

 I am still inclined to refer them to Thunberg's violacea on account of 

 their bluish-tinted wings. I note that Giglio-Tos also referred an 

 Osmilia from the same general locality to this species. 



Genus Rhytidichrota Stal. 



Rhytidichrota Stal, Recens. Orthopt., I, pp. 35, 54 (1873); Bruxer, Biol. Cent.- 

 Amer., Orthopt., II, pp. 222, 237 (1907-1908). 



Several apterous locusts of tropical South America that are below 

 medium in size have been separated under the generic name RJiyti- 

 dichrota. They occur in and about the margins of forests, where they 

 live in moderate numbers among the low herbage. 



129. Rhytidichrota laevifrons Stal. 

 Rhytidichrota lavifrons Stal, Bihang. Svensk. Akad. Handl., V, No. 4, p. 78 (1878). 

 Habitat. — A pair of this locust was collected by J. D. Haseman on 

 October 17th, 1909, at Madeira Falls, Rio Madeira, Brazil. 



Genus Pycnosarcus Bolivar. 



Pycnosarcus Bolivar, Boll. Soc. Esp., VI, p. 392 (1906). 



Polysarcus Saussure (nee Fieber), Rev. Zool., (2), XI, p. 392 (1859); Brunner, 

 Ann. Mus. Genova, XXXIII. p. 148 (1893). 



