6 Annals of the Carnegie Museum. 



Genus Eumastax Burr, 

 i. Eumastax tenuis Perty? 

 Mastax tennis Perty, Delect. Anim. Brasil., 123, tab. XXIV, fig. 3 (1830). 

 Eumastax tenuis Burr, Essai sur les Eumastacides, pp. 44, 45 (1899). 

 Mastax virescens Westwood, Arc. Ent., I, p. 100 (1841). 

 Mastax miniila Bolivar, An. Soc. Esp., X, p. 481 (1881). 



The collection now being reported upon contains a single female 

 specimen, which is doubtfully referred here. It was taken in June 

 by H. H. Smith. 



Habitat. — Para, Brazil. 



Genus Masyntes Karsch. 



Masyntes Karsch, Ent. Nachr., XV, pp. 26, 31 (1889). 



The insects which comprise the genus Masyntes are confined to 



tropical America. They appear to have their center of distribution 



in Paraguay and southern Brazil. A single species, however, occurs 



in Cuba. The several forms may be separated by the annexed 



synoptic table: 



Synopsis of the Species of Masyntes. 



A. Tegmina fully developed, abbreviated or rudimentary, and in some cases 

 even aborted. 

 b. Fastigium of the vertex emarginate, bifid. Pronotum furnished with 



oblique lateral carinae. [Cuba.] gundlachi Scudder. 



bb. Fastigium of the vertex rounded, entire. Pronotum without lateral 

 carinae. 

 c. Smaller (cf , 14-15 mm., 9 , 20 mm.). Pronotum truncate behind. 



d. Middle of pronotum of 9 minutely excised. Hind femora of 9 



15 mm. long. [Paraguay.] borellii Giglio-Tos. 



dd. Middle of pronotum of 9 entire. Hind femora of 9 12.25 mm. 



long. [Chapada, Brazil.] chapadensis sp. nov. 



cc. Larger (cf\ 18-20 mm., 9, 25-26 mm.). Pronotum rounded or sub- 

 angulate behind. 

 d. Tegmina and wings fully developed. Posterior margin of pro- 

 notum rounded. [Paraguay.] tigris Burr. 



dd. Tegmina and wings somewhat abbreviated. Posterior margin of 

 pronotum subangulated. [Chapada, Brazil.] 



brasiliensis sp. nov. 



AA. Tegmina and wings missing. Fastigium of the vertex rounded. [Bahia, 



Brazil.] saurus Burr. 



2. Masyntes brasiliensis sp. nov. 

 About the same in size and with the general appearance of M. 

 tigris Burr, but differing from that species in the shorter hind femora 



