104 OETHOPTEEA. 



PSOLOESSA, Scudder. 



Psoloessa, Scudder, Proc. Bost. Soc. Nat. Hist. xvii. p. 512 (1875) ; McNeill, Proc. Dav. Acad. 



Nat. Sci. vi. p. 272 (1897). 

 Stirapleura, McNeill, loc. cit. pp. 271, 272 (part.). 



The insects belonging to the present genus are all confined to the semiarid regions 

 of the South-western United States and the adjoining portions of Mexico. The eggs 

 of at least two of the species normally hatch late in the autumn, and the nymphs live 

 through the winter beneath dead grass and other debris. These hibernating insects 

 mature early in the following spring, and are among the earliest locusts of the year. 



Table for separating the Species of Psoloessa. 



A 1 . Lateral foveolas of the vertex about twice as long as broad. The 



face, even in the ? , rather strongly oblique [1. texana, Scudd.] 



A 2 . Lateral foveolse of the vertex less than twice as long as broad. 

 The face, at least in the ? , only slightly oblique. 

 b x . Anterior half of the tegmina infuscated by the extension of the 

 post-ocular brown band. Triangular brown spots on the upper 



face of the posterior femora not very distinct 2. buddiana, Brun. 



b 2 . Anterior half of the tegmina not infuscated by the extension of 



the post-ocular brown band. Triangular brown spots on the 



upper face of the posterior femora sharply defined and very 



distinct. 



c 1 . Tegmina thickly and rather evenly maculate throughout, 



except in the scapular area, ash-brown [3. maculipennis, Scudd.] 



c\ Tegmina plain, reddish-brown [4. ferruginea, Scudd.] 



[1. Psoloessa texana, Scudd. 



Psoloessa texana, Scudd. Proc. Bost. Soc. Nat. Hist. xvii. p. 512 (1875) l ; Cent. Orthopt. p. 24 



(1879) \ 

 Stirapleura texana, McNeill, Proc. Dav. Acad. Nat. Sci. vi. p. 272, t. 6. fig. 30 c (1897) 3 . 



Ilab. North America, Texas, California 1-3 .] 



2. Psoloessa buddiana, Bruner. (Tab. I. figg. 8, 8 a, 2 .) 

 Psoloessa buddiana, Bruner, Proc. U.S. Nat. Mus. xii. p. 61, t. 1. fig. 6 (1889) 1 ; McNeill, Proc. 

 Dav. Acad. Nat. Sci. vi. pp. 273, 274 (1897) 2 . 



Hob. North America, Dimmit County, Texas (coll. Bruner), Arizona (Dunn, in coll. 

 Bruner).— Mexico (Bruner), Montelovez in Coahuila (coll. Scudder). 



[3. Psoloessa maculipennis, Scudd. 



Psoloessa maculipennis, Scudd. Proc. Bost. Soc. Nat. Hist. xvii. p. 513 (1875) l ; Cent. Orthopt. 

 p. 25 (1879) 2 ; McNeill, Proc. Dav. Acad. Nat. Sci. vi. p. 273, t. 6. fig. 31 (1897) \ 

 Hab. North America, Texas, New Mexico, Arizona, and California 1 " 3 .] 



