186 GEO. H. HORN, M. D. 



Male. — Anterior tarsi moderately dilated ; last ventral triangularly incised, the 

 emargination with a surrounding gutter. 



Female. — Anterior tarsi narrowly dilated ; last ventral entire. 



This and the preceding species are peculiar in the present group in the 

 oval and very convex thorax and the roughly sculptured elytra. While 

 closely related in these respects, they differ markedly in the form of the 

 head and the color of the elytra and legs. 



I have seen but three specimens, — two females collected in Pennsyl- 

 vania without more definite statement of locality, and a male from the 

 District of Columbia. 



P. politus Fab. — Form moderately robust, black, shining ; elytra with dis- 

 tinct aeneous lustre; antennae as long as the head and thorax, joints all longer 

 than wide, piceous, under side of basal joint pale testaceous; head moderate in 

 size, quadrate oval, smooth, shining, a few large punctures behind the eyes ; thorax 

 oval, very little longer than wide, slightly narrowed in front; sides scai'cely sin- 

 uate posteriorly, dorsal punctures not deeply impressed ; elytra wider than the 

 thorax, not longer than wide conjointly; surface densely not coarsely punctate, 

 finely pubescent; abdomen black, shining, somewhat iridescent, moderately 

 densely punctate, the punctures coarser than those of the elytra, sparsely pubes- 

 cent, beneath as above; legs and t^oxse black. Length .36 inch; 9 mm. 



itfa/e.— Unknown to me. 



Female. — Anterior tarsi slightly dilated ; last ventral entire. 



This species bears some resemblance to asper., but tlie thorax is less 

 narrowed in front, the elytra more finely and less roughly punctured, the 

 abdomen more densely punctured. The antennal character is uni(jue in 

 the genus, the upper side of the first joint being piceous, or nearly black, 

 the under side very pale. ^ 



I have never seen any native specimens, but Mr. Fauvel informs me 

 that he has one from North Carolina and another from " Amer. Bor." 



P. irinus n. sp. — Form slender, black, shining; elytra slightly bronzed ; legs 

 piceous; antennae not longer than the head and thorax, black, three basal joints 

 piceous, joints 4-10 broader than long, the outer ones especially transverse; head 

 orbicular, hind angles sparsely punctate ; thorax quadrate oval, not at all narrowed 

 in front; sides not sinuate, disc convex, dorsal punctures not deeply impressed; 

 scutellum roughly punctured; elytra very little wider than the thorax, conjointly 

 a little wider than long; surface densely sub-muricately punctured, sparsely pu- 

 bescent; abdomen black, shining, usually beautifully iridescent, coarsely and 

 moderately densely punctured and sparsely pubescent, beneath black, the margins 

 of the segments brown ; surface shining, coarsely and moderately closely punc- 

 tate. Length .34 — .3fi inch ; 8.5 — 9 mm. 



Male. — Anterior tarsi moderately dilated; last ventral segment rather deeply 

 triangularly emarginate, without gutter. 



Female. — Anterior tarsi very narrowly dilated ; last ventral entire. 



