1907.] NATURAL SCIENCES OK PHILADELPHIA. 187 



original measurements demonstrates, the individuals recorded by 

 Bruner as A. unicolor from Cordoba and Carcarana, Argentina being 

 distinct. 



DICHROPLUS Stai. 

 1S73, Dichroplus Stal, Kecensio Urthopterorum, I, p. 78. 

 Included D. arrogans patruelis, cliens and lemniscatus (Stal), of which 

 the first can be considered the type. 



Dichroplus robustus Bruner. 



190(3. Dichroplus robustus Bruner, Proc. U. S. Nat. Mus., XXX. p. G79. 

 [Sapucay, Paraguay.] 



2 cJ^, 2 9 . February and March, 1905. 



As the male of this species is at present undescribed, a few notes on 

 the appendages of this sex may be of service. 



Furcula present as very minute short fingers lying close together. 

 Supra-anal plate broad with the apex obtuse-angulate and the median 

 ridges approaching to about the middle of the plate, from which caudad 

 they are subparallel. Cerci slender, long, distinctly tapering in the 

 proximal half from a rather broad base to a slender rounded shaft, 

 beyond which they have a slight ventral falcation, being also slightly 

 compressed distad and with the apex acute. Subgenital plate rather 

 short, conical, horizontal, margins straight and with a small apical 

 indentation. 



The females are slightly smaller than the measurements given by 

 Bruner, but appear without doubt to be this species. All the sj^ecimens 

 are darker than those described by Bruner. 



Dichroplus paraguayensis Bruner. 



190G. Dichroplus pnraguayensis Bruner, Proc. U. S. Nat. ^lus., XXX, p. 

 680. [Sapucay, Paraguay.] 



7 c?, 2 9 . February and March, 1905. 



These specimens appear to fully represent this species, which, 

 without other material, would be hard in the female sex to distinguish 

 from robustus. One female specimen measures, length of body, 31.5 

 rnm. ; length of pronotum, 7.5; length of tegmen, 24; length of caudal 

 femur, 17.5. 



Dichroplus exilis Giglio-Tos. 



1894. D[ichroplus] exilis Giglio-Tos, Boll. Mus. Zool. Anat. Comp., IX, No. 

 184, pp. 23. [Resistencia nel Chaoo, Argentina.] 



1 cJ', 3 Q . February and March, 1905. 



Superficially this species bears some resemblance to D. hergii, but is, 

 of course, a very different insect, the apparent similarity being chiefly 

 in color pattern. 



