42 Annals of the Carnegie Museum. 



Genus Omura Walker. 

 Omura Walker, Cat. Dermapt. Salt. Brit. Mus., Ill, p. 503 (1870). 



60. Omura congrua Walker. 

 Omura congrua Walker, Cat. Dermapt. Salt. Brit. Mus., Ill, p. 503 (1870). 

 Prolomachus depressus Stal, Bihang Svensk. Akad. Handl., IV, no. 5, p. 53 (1876). 



Habitat. — The collection contains specimens of this insect coming 

 from both Para and Santarem, Brazil. They were collected during 

 the months of April to July inclusive. 



61. Omura congrua var. brunneri n. var. 



Very similar to the typical form, but differing from it in being much 

 smoother, in having shorter antennae, and in its somewhat smaller size. 



Length of body, cf, 30 mm., 9 , 46 mm.; of pronotum, cf, 4.6 mm., 

 9, 7 mm.; of antennae, o 71 and 9, 8.5 mm.; of hind femora, o 71 , 

 13 mm., 9 , 17 mm. 



Habitat. — Demerara, British Guiana. March and April, 1901 (R. J. 

 Crew, collector). 



Specimens of this insect are in the collection of the present writer. 



Family CYRTACANTHACRIDJE (Acridiidae). 



The spine-breasted locusts comprise by far the most extensive 

 family of these insects for the world as a whole. Especially is this 

 statement true as regards the American continent, where its repre- 

 sentatives greatly outnumber those of all the other families of locusts 

 combined. Not only do we find a preponderance of species in the 

 group, but of genera as well; and in many instances the individuals 

 of species are likewise excessive. It is among the representatives of 

 this family that we find the greatest diversity in size, form, coloration, 

 and even of habits. Our largest, and, aside from some of the grouse- 

 locusts, smallest, representatives of the suborder belong here. Most 

 of the species, which are at times present in different regions of America 

 as pests, are likewise members of this family. 



Living among the rankest vegetation in forest, jungle, swamp, 

 savanna, or pampa, prairie, plain, and even in desert regions, as a 

 majority of the representatives of the family do, an unusually large 

 percentage of the forms still remain unknown. Notwithstanding this 

 fact upwards of one hundred and forty distinct genera are already 

 known from the South American continent alone. Everv small col- 



