Bruner: South Amkkican Acridoidea. 31 



Genus Staurorhectus Giglio-Tos. 

 Staurorhectus Giglio-Tos, Boll. Mus. Zool. Anat. Torino, XII, No. 302, p. 26 

 1897). 

 The species of this genus are distributed over portions of Argentina, 

 Bolivia, Paraguay, and southern Brazil. The described forms may be 

 separated as follows: 



Synopsis of tiik Species of Staurorhecti s. 

 I. I audal femora without, or with rather indistinct, pregenicular annuli of 

 yellow . 

 b. Size large; female ranging from 30 to 38 mm. in length of body. 



longicornis Giglio-Tos. 

 bb. Size medium; female ranging from 28 to 30 mm. in length of body. 



longicornis variegatus Rehn. 

 11 ( audal femora with very pronounced pregenicular annuli of yellow. Size 

 rather small. 

 b. Tegmina of both sexes much shorter than the abdomen. Antennae uni- 



colorous, black brevipennis Rehn. 



bb. Tegmina of both sexes equal to, or longer than, the abdomen. Antennae 

 with pallid tip intermedins sp. nov. 



38. Staurorhectus longicornis Giglio-Tos. 

 Staurorhectus longicornis Giglio-Tos, Boll. Mus. Zool. Anat. Torino, XII, No. 302 

 p. 26 (1897). 



Habitat.— Corumba and Chapada near Cuyaba, Matto Grosso, 

 Brazil, where it was taken in large numbers from March to August 

 inclusive (H. H. Smith). The variation in color is great, and there is 

 also quite a disparity of size among the specimens at hand. None 

 of the individuals examined seem to belong to the form longicornis 

 variegatus Rehn (see Proc. U. S. Nat. Mus.. XXX, p. 377 (1906)). 



39. Staurorhectus brevipennis Rehn. 

 Staurorhectus brevipennis Rehn, Proc. I T . S. Nat. Mus., XXX, p. 377 (1906). 



Habitat. — Corumba, Matto Grosso, Brazil, during July (H. H. 

 Smith). Several specimen-. 



40. Staurorhectus intermedius sp. nov. 

 About the size of, and somewhat similar to, Staurorhectus brevipennis 

 Rehn, but differing from that insect in having the tegmina and wings 

 fully developed, the lateral carina; of the pronotum almost obliterated 

 on the anterior lobe, and in having the long, slender, black antennae 

 pale-tipped. Valves of ovipositor similar to those of Amblyscapkeus 

 glaucipes Rehn (lineatus Brunerb 



