NORTH AMERICAN COLEOPTERA. 201 



Male. — Anterior tarsi broadly dilated ; lastventi'al segment broadly ti-ianguUirly 

 einarginate with a triangular depression. 



i^ema/e.— Anterior tarsi very feebly dilated ; last ventral entire. 



Although the legs vary in color from nearly black to testaceous, the 

 anterior coxre are always conspicuously rutb-testaceous. 

 This species, by its depressed elytra, is related to the rest. 

 Occurs in Colorado, Utah, Indian Territory and Wyoming. 



P. Schwarzi n. sp. — Body fusiform, very black and shining; antennae black, 

 a little longer than the head and thorax, joints all longer than wide; head rela- 

 tively small, orbicular, slightly oval, hind angles punctulate; thorax much wider 

 than the head, oval, narrower in front, not longer than wide, dorsal punctures fine 

 and equidistant; elytra very little wider than the thorax, conjointly a little wider 

 than long, feebly shining, densely and finely sub-muricately punctured, pubes- 

 cence very short; abdomen iridescent, more coarsely and much less densely punc- 

 tured than the elytra; beneath similarly punctured. Length .40 inch: 10 mm. 



iV/a/e.— Anterior tarsi narrowly dilated ; last ventral segment with a small tri- 

 angular emarginalion surrounded by a distinct gutter. 



Female. — Anterior tarsi scarcely at all dilated; last ventral entire. 



This species is much the largest of the present series, and is (juite con- 

 spicuous by its very black surface and iridescent abdomen. 

 Occurs in Massachusetts and at Detroit. 



P. hudsoilicus n. sp. — Form slender, elongate, black, moderately shining; 

 antennse rather slender, a little longer than the head and thorax, joints all longer 

 than wide ; head broadly oval, hind angles sparsely punctulate ; thorax wider than 

 the head, oval, narrowed in front, a little longer than wide, dorsal punctures fine 

 equidistant; elytra wider than the thorax, conjointly longer than wide, densely, 

 moderately finely punctured, slightly shining, pubescence brownish, sparse; ab- 

 domen moderately closely punctate, the punctiires coarser than those of the elytra ; 

 beneath similarly {Punctured. Length .26 — .30 inch; 6.5—7.5 mm. 



Male. — Anterior tarsi narrowly dilated ; last ventral segment with a small trian- 

 gular emargination surrounded by an elongate triangular impression. 



i^cnui/e.— Anterior tarsi nearly as wide as in the male; last ventral entire. 



The only s})ecies resembling this are tichicarzi and Fettiti. The for- 

 mer is larger and more robust, the latter somewhat larger, with the thorax 

 shorter and different male chanicters. 



Occurs in Canada and the Hudson's Bay region. 



P. Pettiti n. sp. — Moderately elongate, black, shining; antennm a little lon- 

 ger than the head and thorax, joints all longer than wide ; head relatively small, 

 oval, hind angles sparsely punctate; thorax much wider than the head, oval, nar- 

 rowed in front, not longer than wide, dorsal punctures fine equidistant; elytra a 

 little wider than the thorax, conjointly nearly square, densely, rather finely punc- 

 tulate, feebly shining, pubescence sparse; abdomen iridescent, coarsely moderately 

 closely punctured; beneath more iridescent, punctures rather finer than above. 

 Length .:U— ..'{6 inch ; 8.5—9 mm. 



TRANS. AMER. ENT. SOC. XI. (51) JtTNE, 1884. 



