52 PROCEEDINGS OP THE AMERICAN ACADEMY. 



This definition will leave P. texana Scudd. in Psoloessa, instead of 

 transferring it to Stirapleura, as was done by McNeill, doubtless on 

 account of the slightly more marked oblique carinaj of the lateral lobes of 

 the pronotum. The face is generally a little more oblique in Psoloessa 

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

 frontal costa hold in Psoloessa only for P. huddiana Brun. 



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

 from southern California, heretofore regarded as identical with S. 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 I find the Californiau species to have a slenderer form, longer teg- 

 mina and wings, and the upper inner angle of the lateral foveolns 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 carinas of the pronotum and approaching Psoloessa in the feeble- 

 ness of the oblique carinas of the lateral lobes. 



Stirapleura pusilla sp. nov. 



Head moderately prominent, subasceuding, the fastigium of the vertex 

 rather deeply sulcate with elevated, anteriorly acutangulate margins ; 

 lateral foveoliB 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 ; antennsB distinctly but 

 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, e({ual, cut barely 

 in advance of the middle, the lateral carinae 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 

 carinas. Color cinereous, generally much marked with fuscous and black, 

 paler beneath than above, but very variable ; face generally testaceous, 

 the frontal costa more or less infuscated, the gense generally dotted with 

 fuscous or infuscated, 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 



