m. 1461. LIST OF PAHA O UA YAIT LOCUSTS— BR UNtJR. 677 



dently niiiii}^ of these reports are Ixised on specimens of the preceding 

 species. I ni3\se]f have seen no typical specimens of ■pere<jr'uia tihat 

 were taken on this side of the Atlantic. 



ATRACHELACRIS Giglio-Tos. 



ATRACHELACRIS UNICOLOR Giglio-Tos. 



Plate XXXVIII, fig. 8, female; fig. 0, male. 



Atrarhelacriff nuicolor (.iuiLio-Tos, P.()ll. Miis. Zool. Aiiat. Torino, I X, 1894, No. 184, 

 p. 21. 



Bahitat. — Several specimens of the two sexes from Sai)ucay, Para- 

 guav, are before me. They were collected ))y W. 'l\ Foster. It is 

 also reported from Asuncion by Giglio-Tos. 



DICHROPLUS Stal. 



Many of the insects which comprise this extensive genus are very 

 closel}^ related to one another in their general appearance, and the 

 comparatively few forms thit have thus far been noted by entomologists 

 have been so briefly described that it is a little doubtful as to the iden- 

 tity of all of them. This is especially true when the student is limited 

 in the material that is accessible for study. With comparatively few 

 exceptions the members of the genus are confined to regions south of 

 the equator in South America, with Paragua}^ and northern Argentina 

 as the center of their distribution. This being true, most of the species 

 may be expected to occur in the countr}^ now under consideration. 

 The subjoined table will be of assistance in determining them. 



TABLE FOR DETERMINATION OF 8PECIE8. 



a. Female with the valves of the ovipositor emarginately truncate. Interval between 

 the niesosternal lobes considerably longer than wide. Male cerci moderately 

 long, compressed back of middle, l)eyond gently Ixjwed. 

 b. Prosternal tubercle large, transverse. Lower edge and inner face of hind femora 



blood-red. General color dull l>rown ohscurun Bruner 



bb. Prosternal tubercle not large, conical. Lower edge and inner face of hind 

 femora yellowish, 

 c. Smaller. General color olivaceous yehow. Upper valves of ovipositor much 



longer than the lower ones cliens Stal 



cc. Larger. General color brownish yellow. Upper valves of ovipositor but 



little longer than lower ones letnniscatus (Stal) 



aa. Female with the valves of the ovipositor entire at apex, acuminate or subacumi- 

 nate. Interval between the niesosternal lobes usually, but not always, as 

 broad or a little broader than long. 

 b. Hind tibiie with nine spines in outer row. Tegmina and wings usually, but not 

 always, reaching or surpassing the tip of abdomen. 

 c. Interval between the ineaosternal lobes a little longer than wide. Upper edge 

 of sides of pronotum generally dusky throughout, but sometimes only to 

 the posterios sulcus. 

 d. Tegmina not or scarcely surpassing the tip of hind femora. 



