HlSTERID/E 2O3 



elytral striae in aqua, which constitute its most salient differential 

 character. From coarctata the present species differs in its entire 

 fifth, and virtually entire sutural, stria, besides the absence of 

 mesosternal margin ; it is distinctly broader than coarctata. These 

 species represent the subgenus Cylistosoma of Lewis, in our fauna. 

 Of Cylistix cylindricus Payk., I have a very small specimen from 

 Peekskill, New York; individuals seem to vary very much in size, 

 3.7-5.5 mm. more so than is generally the case in these cylindrical 

 species. Platysoma depressa varies a good deal in size, but Carolines, 

 is more constant. In Cylistix gracilis the prosternal lobe is com- 

 pletely devoid of an apical marginal bead, constituting a remarkable 

 exception in both Cylistix and Platysoma. 



Psiloscelis Mars. 



The broad parallel hind tibiae, together with the special facies due 

 to the dense sculpture of the integuments, indicate that Psiloscelis 

 is a fully valid genus, as now generally acknowledged, and is not 

 in any way a subgenus of Ulster; the name harrisi Lee., has therefore 

 to be reinstated for the species sometimes called planipes Lee.- a 

 change of name made by LeConte when certain heterogeneous 

 elements, such as Psiloscelis, Margarinotus, Hister, Platysoma and 

 others were united to form a single genus. Besides perpunctata, 

 harrisi and corrosa, my collection contains representatives of three 

 other species, seemingly undescribed, as follows: 



Psiloscelis incurva n. sp. Shorter and relatively rather broader than 

 harrisi, but resembling that species almost exactly in sculpture and 

 general structure; head finely and closely punctate, the frontal stria 

 forming a strong reentrant angle medially, the epistoma shining, with 

 the very fine punctures rather close but not dense; prothorax throughout 

 as in harrisi, except that the punctures are slightly less coarse; elytra 

 similar but slightly shorter, the coarse deep close-set punctures as in 

 harrisi, the dorsal striae also nearly as in that species but not so broad, 

 relatively deeper and more groove-like and with both their edges sharply 

 defined; in harrisi the inner edges of the striae gradually slope upward, 

 without distinct limits, the outer edges very sharply defined; flanks with 

 the basal part of the humeral stria obsolescent, barely traceable by a 

 few disconnected punctures, the apical part in the form of an irregular 

 groove half as long as the elytra, the subhumeral strong, downwardly 

 arcuate, extending from the base not quite to the middle; under surface 

 and tibiae as in harrisi, except that the mesosternal sinus is shallower. 

 Length 6.7 mm.; width 4.8 mm. New York (the locality unrecorded). 



