REHN AND HEBARD 183 



as late as August 28, probably much later as nymphs were taken at 

 Benavides on August 10. 



Morphological Notes. — The structural variation found in the 

 species is not very great aside from that of the number of discoidal 

 rami. The caudal margin of the disk of the pronotum is rarely 

 considerably emarginate mesad, while the humeral sinus of the 

 same is always rectangulate in general form, but with its immediate 

 angle occasionally rounded. The number of discoidal rami varies 

 from three to five, the latter number present equally on both teg- 

 mina in two males and on a single tegmen in one male and one fe- 

 male. The more frequent numl)er is three or four, generally equal 

 in number on the two tegmina. the number unequal in eight speci- 

 mens of both sexes. In the male cercus there is some slight vari- 

 ation in the robustness of the distal extremity and very faintly of 

 the whole cercus. Some male individuals show slight variation 

 from the more normal type in the amount of depression of the whole 

 cercus. These features of the pronotum, tegmina and genitalia 

 are purely individual and have no geographic significance. 



Remarks. — The present form is probably as a whole the most 

 sharply defined of the genus. The combination of a very decidedlj- 

 sellate pronotum with full rounded lateral lobes, which latter also 

 have a peculiarly modified surface, a different texture to the teg- 

 mina as well as a very large tambourine of the same in the male, 

 unarmed dorso-genicular regions of the cephalic and median femora 

 and short elliptical eyes will readily serve to differentiate this 

 species. It is limited in distribution to a region shared with a 

 number of equally peculiar forms of Orthoptera. 



Specimens Examined: 27; 17 cf , 7 9,36^ nymphs. 



San Diego, Duval County, Texas, July 12, (E. A. Schwarz), 1 o"', 

 [U.S.N.M.]. 



Benavides, Duval County, Texas, August 9 and 10, 1912, (R. & H.), 10 

 cf, 4 9. Type, allotype puratypes; 2 cf nymphs. 



Katherine, Willacy County, Texas, August 8, 1912, (R. & H.), 2 d^, 2 9, 

 1 cf nymph. 



Ringgold Barracks, Starr County, Texas, (Schott), 1 cf , [Scudder Col- 

 lection]. 



Carrizo Springs, Dimmit County, Texas, May, 1886, June, 1885 and 

 August 28, 1885, (A. Wadgvmar), 3 cf , 1 9, [Hebard Collection and U.S. 

 N.M.I. 



TRANS. AM. ENT. SOC, XL. 



