638 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxx. 



Sii bfainily I'YK&OTvIORPHIlSr.*:;. 



The present group of locusts, like the precedino- subfamily, is rather 

 poorly represented in this moist region, where vegetation is abundant 

 and rank. Four genera may bo contained among the locust fauna of 

 Paraguay. They may be separated as follows: 



TABLE FOR DETP:RMINATI0N OF GENERA. 



a. Body more or less graceful and cylindrical, somewhat rugose. The antennae 

 filiform. Pronotum feebly carinated. 

 b. Tegmina and wings perfectly developed, extending considerably beyond the 

 tip of the abdomen in both sexes. Carinse of hind femora smooth. Internal 



angles of mesosternal lobes rounded at apex Ossa Giglio-Tos 



hi). Tegmina and Avings somewhat abbreviated. Carinaj of hind femora toothed. 



Internal angles of mesosternal lobes not rounded Owmt'-'Yc/to Serville 



aa. Body very obese and greatly depressed; coarsely tuberculate, carinated and 



spined. Antenn;e with the joints somewliat flattened, subensiform. Pro- 



notal carina always more or less cristate. 



b. Tegmina and wings present. Pronotum without the lateral toothed, leaf-like 



expansion; its hind border broadly angulate and adorned with five flat, 



tooth-like projections — the middle one furcate SpathaUum Bolivar 



bb. Tegmina and wings wanting. Pronotum furnished at lower lateral edges with 

 a toothed, leaf-like expansion; its hind border broadly rounded and adorned 

 with a series of six distinct, heavy, blunt si)ines (/r.ra Philippi 



OSSA Giglio-Tos. 

 TABLE FOR DETERMINATION OF SPECIES. 



a. Body covered with long white hair. Tegmina above with an orange spot at l>ase. 



Eyes globose. Posterior femora moderately heavy bimaculata Giglio-Tos 



aa. Body subglaljrous. Tegmina above without a basal spot. Eyes ovoid. Pos- 

 terior fefnora somewhat slender viridis Giglio-Tos 



OSSA BIMACULATA Giglio-Tos. 



Ossa hiuiaculata Gigmo-Tos, Boil. Mus. Zool. Anat., Torino, IX, 1894, No. 184, 

 p. 15. 



Ifahitat. — Several specimens, both sexes, from Sapucay, Paraguay 

 (W. T, Foster). It also occurs in the northern portions of Argentina, 

 eastern Bolivia, and southern Brazil. 



OSSA VIRIDIS Giglio-Tos. 



Plate XXX VIII, fig. 5. 



Ossa viridis Giglio-Tos, Boll. Mus. Zool. Anat., Torino, XII, 1897, No. 802, p. 27. 



//rtZ>/^^//.^ Northern Argentina and several localities in the Bolivian 

 Chaco (Giglio-Tos). It is also very common in the Argentine Prov- 

 inces of Cardoba and Santa Fe, where it is found feeding on a certain 

 Nycotiana or plant of an allied genus. It most assuredly occurs also 

 in Paraguay 



