170 PROCEEDINGS OF THE ACADEMY OF [May, 



LocustiDse {Acridinoe of authors). 



Colpolopha obsoleta (Serville). 



1831. Tropinotus obsoletus Serville, Ann. Sci. Nat., XXII. p. 274. ["Cape 

 of Good Hope."] 



Igarape-assii. One male. 



This specimen is inseparable from British Guianan males of 



the species, which has been recorded from Santarem (Rehn) and 



Para (Bruner), Brazil. 



Tropidacris collaris (StoU). 



1813. Gryllus (Locusla) collaris Stoll, Natuurl. Afb. Beschyr. Spooken, etc., 

 Trek-springhaanen, pp. 39, register 13, pi. XXIV, fig. SO. [No locality.] 



Igarape-assii. One dated January 17, 1912. One male, two 



females. 



Stenaoris cylindrodes (Stai). 



1860. Opsomala cylindrodes StS.1, Kong. Svenska Freg. Eugenies Resa, 

 Ins., p. 325. [Rio de Janeiro, Brazil.] 



Igarape-assu. One female. 



This specimen is inseparable from south Brazilian material. 



Oxyblepta xanthochlora (Marschall). 



1835. Gryllus xanthochlorus Marschall, Ann. Wiener Mus., I, p. 215, pi. 

 XVIII, fig. 7. [Brazil.] 



Igarape-assu. One dated January 17, 1912. Two males, two 

 females. 



These specimens are only provisionally referred to this species, 

 as the forms of the genus found in northern South America and 

 their relationship is very poorly understood. 



Mastusia caeruleipennis Bmner. 



1911. Mastusia caeruleipennis Bruner, Ann. Carneg. Mus., VIII, p. 86. 

 [Benevides, state of Para, Brazil.] 



Igarape-assu. Three males, two females. 



This species was described from a female, apparently unique. 



The male sex fully agrees with the important features of the original 



description, except for the genital characters and those features 



in which the males of this group show some difference from the 



female, i. e. smaller size, proportionately narrower interocular 



space of the vertex, more prominent eyes and slightly more distinct 



median carina of the pronotum. In size the male specimens before 



us show the following measurements : 



Length of body 22.3 mm. 19 mm. 19.5 mm. 



Length of pronotum 4.4 " 4 " 4.3 " 



Greatest dorsal (caudal) width of 



pronotum 2.2 " 2.1 '' 2.2 " 



Length of tegmen 11 " 9 " 10- '' 



Length of caudal femur 13.1 " 12.1 '' 13.5 " 



