218 OEO. H. HORN, M. I). 



The identity of the species has been determined from description 

 alone, and from a specimen sent me by Mr. Fauvel I find that he has 

 made at a simihir determination. 



Ahiska, Washington Territory, Vancouver and one from Arizona. 



P. instabilis n. sp. — Black, legs piceous, elytra slightly bronzed ; antennse 

 as long as the head and thorax, piceous, joints all as long or longer than wide; 

 head oval, slightly narrowed behind the eyes, hind angles sparsely piinctulate • 

 thorax a little wider than the head, nearly as broad as long, slightly narrowed in 

 front, dorsal punctures six, sometimes placed in groups of three; elytra. a little 

 wider and longer than the thorax, longer than wide conjointly, rather densely 

 punctate, sparsely pubescent ; abdomen much more finely and sparsely punctured 

 than the elytra; beneath more distinctly punctured than above. Length .24 inch ; 

 fi mm. 



Male. — Anterior tarsi filiform; last ventral segment with a very feeble, broad 

 emargination, and a slight trace of a triangular impression. 



Female. — Tarsi filiform ; last ventral entire. 



This species resembles in general appearance Jilicornis, already de- 

 scribed. The dorsal punctures of the thorax, as stated above, are some- 

 times placed in groups of three in the two series, usually, however, the 

 series is continuous, and the punctures arranged in a slightly sigmoid curve. 

 Occurs in Colorado and Wyoming. 



P. picicoriiis n. sp. — Piceous or brownish, legs testaceous; antennae brown- 

 ish, shorter than the head and thorax, rather robust, joints 4-1(1 not longer than 

 wide, the outer ones quite transverse; head sub-quadrate, sparsely punctured be- 

 hind the eyes ; thorax scarcely wider than the head, longer than wide, not nar- 

 rowed in front, dorsal punctures six, arranged in a slightly sigmoid curve; elj'tra 

 a little wider and about as long as the thorax, conjointly nearly square, moder- 

 ately closely punctate, sparsely pubescent; abdomen more finely punctured than 

 the elytra and very sparsely; beneath sparsely punctate, feebly shining. Length 

 .18 — .22 inch ; 4.5 — 5.5 mm. 



Male. — Anterior tarsi filiform ; last ventral segment with a very feeble trace of 

 emargination, but with a well marked, rather deep, small triangular impression. 



Female. — Tarsi filiform: last ventral entire. 



A very inconspicuous species with nothing remarkable in its structure. 

 As a member of the series with simple tarsi, it can be associated with 

 alhionicus alone from the number of dorsal punctures. It differs from 

 that species by the very much shorter and stouter antennae and the male 

 ventral characters. 



Occurs at Lake Tahoe, Nevada. 



It is barely possible that the specimen referred to in a preceding de 

 ■cription as Schivarzi Fv. may belong here. The dorsal punctures of 

 the specimen before me are rather irregular in both series, and disagree 

 in their number. If it is really a six-punctate species, as one side indi- 

 cates, I have no hesitation in placing it here from its other characters. 



