52 PROCEEDINGS OF THE AMERICAN ACADEMY. 



This definition will have P. texana Scndd. in Psoloessa, instead of 

 transferring it to Stirapleura, :i> was done by McNeill, doubtless on 



account of the .dightly more marked oblique carina of the lateral lolx-s of 

 the pronotum. The face is generally a little more obliijue in lVoloessa 

 than in Stirapleura, but the distinctions drawn by McNeill from the 

 fnmtal costs bold in Psoloessa only for P. buddiana Bran. 



As to the species of Stirapleura, I am inclined to look on the form 

 from southern California, heretofore regarded as identical with & delica- 

 tula (Scudd.) of Colorado to be distinct from though closely allied to it. 

 I have before me a considerable series (more than a hundred) of each, 

 and 1 find the Californhiu species to have a slenderer form, longer teg- 

 inina and wings, and the upper inner angle of the lateral foveols of the 

 vertex distinctly more rounded so as to make them less distinctly rhom- 

 boidal than in S. delicatida. I describe it herewith, together with 

 another new species from Texas, remarkable for the delicacy of the 

 lateral carina of the pronotum and approaching Psulucs.sa in the feeble- 

 ness of the oblique carina; of the lateral lobes. 



Stirapleura pusilla sp. nov. 



Head moderately prominent, subasceuding, the fastigium of the vertex 

 rather deeply 6uleate with elevated, anteriorly acutangulate margins ; 

 lateral foveolae nearly or quite half as long again as greatest breadth, sub- 

 rhomboidal, but narrower interiorly than exteriorly, with the inner upper 

 angle distinctly rounded; frontal costa much contracted at summit, more 

 or less gradually broadening, sulcate throughout but only feebly at base, 

 punctate within the raised and smooth margins; antennas distinctly bat 

 not greatly longer than head and pronotum together, especially in the 

 male. Pronotum considerably constricted mesially. the posterior margin 

 obtusangulate, the median carina moderately prominent, equal, cut barely 

 in advance of the middle, the lateral carinas equally prominent, bent- 

 arcuate and strongly divergent, especially behind, so that the disk of the 

 pronotum is about twice as broad posteriorly as near the middle, the 

 lateral lobes more or less corrugated at the shoulder just below the lateral 

 carina*. Color cinereous, generally much marked with fuscous and black, 

 paler l>eneath than above, but very variable; face generally testaceous, 

 the frontal costa more or less iufuscated, the geiuc generally dotted with 

 fuscous or iufuscated, sometimes with the exception of a broad arcuate 

 oblique subocular stripe ; the occiput may or may not be striped with 

 testaceous and fuscous, but there is usually a broad postocular fuscous 

 stripe extending across the lateral lobes, where it is often followed below 



