202 GEO. H. HORN, M. D. 



Male. — Anterior tarsi rather broadly dilated ; last ventral segment with. a small 

 triangular emargination surrounded by a distinct gutter. 

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



The difference between this species and its closer allies have already 

 been referred to. 



Occurs in Washington Territory and California. 



P. triitngulnin n. sp. — Black, shining, elytra dark red, the sides and suture 

 (more widely at base) black ; legs piceous ; antennae as long as the head and thorax, 

 piceous, joints all longer than wide; head sub-quadrangular, hind angles sparsely 

 punctate ; thorax wider than the head, not longer than wide, distinctly narrowed 

 in front, moderately convex, dorsal punctures approximated, equidistant; elytra 

 wider than the thorax, conjointly nearly square, disc depressed ; surface shining, 

 not densely punctured, sparsely pubescent; abdomen densely and finely punctured 

 with a velvety aspect, the punctures very much finer than those of the elytra; 

 beneath densely punctured, the punctures a little coarser than above; legs black 

 or piceous, the anterior coxse piceous. Length .24 — .28 inch; 6 — 7 mm. 



Male. — Anterior tarsi rather broadly dilated ; last ventral of male broadly tri- 

 angularly incised with a moderately long triangular imj^ression. 



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



The coloration of the numerous specimens before is quite constant. 

 The elytra are dark red, with the sides and suture piceous. The sutural 

 piceous space is usually broader toward the base of the elytra and extends 

 along the base to the humeri. Very rarely the elytra are entirely red, 

 in which case it resembles the preceding species, from which the finely 

 and densely punctured abdomen will distinguish it. In all the collections 

 I have seen a variety of the next species is often intermixed, from a 

 general similarity of coloration. It may, however, be known in wliatever 

 color it occurs by the depressed elytra and very finely punctured abdo- 

 men. 



Occurs in Washington Territory, Nevada and California. 



f», terreipennis n. sp. — Form moderately elongate, piceous, shining: ely- 

 tra reddish brown; antennce not longer than the head and thorax, piceous, joints 

 6-10 as wide as long; head oval, slightly quadrate, a few coarse punctures behind 

 the eyes; thorax wider than the head, oval, nearly as wide as long, very slightly 

 narrowed in front; sides not sinuate, dorsal punctures rather strongly impressed ; 

 elytra wider than the thorax, a little wider than long, rather finely and moder- 

 ately densely punctured, pubescence very fine and black, color usually entirely 

 ferruginous, sometimes with the suture and entire margin 2:)iceous; abdomen above 

 shining, iridescent, punctuation coarser but less dense than on the elytra; beneath 

 as above; anterior and middle legs usually testaceous, anterior coxae testaceous, 

 posterior legs always piceous. Length .24 — .28 inch ; 6 — 7 mm. 



Male. — Anterior tarsi moderately dilated ; last ventral segment broadly trian- 

 gularly emarginate, with a triangular depression extending forward. 



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



