98 JAMES A. G. REHN. 



One specimen ; female, Rio Cocula, Gnerrero, xii. 

 This agrees very well with Scudder's description of the type from 

 Cuernavaca. 



Schistocerca vaga Scudder. 



1S76, Acridiam vttgum Scudder, Proc. Bost. Soc. Nat. Hist., xvii, \). 269. 



Five specimens ; females, Taenbaya, D. F., v. 



Two of these specimens are much lighter in color than the others, 

 and it is with some hesitation I place them here, though sei)aration 

 would he difficult. 



9Ielauu|>liis spretis Thomas. 



1865, Acridium spretis Thomas, Trans. 111. State Agr. Soc, v, p. 450. 



One specimen ; <? , Tacubaya, D. F., viii. 



This specimen is a more southern record than any to my knowledge. 



IVIelaiiopliis corpuleiitus Scudder. 



1899, Melnnopliis corpidentns Scudder, Proc. U. S. Nat. Mus., xx, p. 313. 



Ten specimens ; four males, six females, Eslava, D. F. (9), x, and 

 Orizaba, Vera Cruz (1), vi (xi?). 



Melanoplus sp. ? 



Two specimens ; 9 , Orizaba, Vera Cruz, vi, (xi ?). 



The females of this genus are very difficult to deterniine without 

 accompanying males, so I have reserved my decision on these speci- 

 mens until a satisfactory amount of material of both sexes is accu- 

 lated to form the basis of anything like accurate determination. 

 One male of M. corpulentus is labeled and dated the same, but that 

 these are distinct from corpulentus is perfectly plain on an examina- 

 tion of six females from Eslava. 



Perixerus Isevis u. sp. 



Type; one specimen ; 9 , Eslava, D. F., x. 



This species differs from P. squamipennis Gerstaecker in the ab- 

 sence of pubescence and in the greatly different color pattern. 



Form moderately slender. Head with the scutellum very slightly excavated ; 

 frontal costa shallowly sulcate inferior to the antennie, punctate superiorly ; 

 lateral facial caringe obsolete. Eyes almost hemispherical, the base being ante- 

 rior. Antennae longer than the pronotum. Pronotum finely punctate superiorly, 

 and on the lateral portion of the metazona. Anterior border semi-truncate, pos- 

 terior about the same. Posterior margin of the lateral lobes obliquely descend- 

 ing; lower margin obtuse-angulate. Tegmina as in sqnamipeunis, the venation 

 being strongly in relief. Posterior tibiae with eight spines on the external bor- 

 der. The entire specimen glabrous. 



