310 GEO. H. HORN, M. D. 



This genus as will be seen, is closely allied to Thali/cra, but differs 

 in the anterior tibiae dentate externally and the anterior tarsi dilated 

 in the male only. The antennal club although three-jointed in both 

 sexes is much more distinctly so in the male, the terminal joint in 

 the other sex being strongly retracted. 



One species is known. 



P. Murray! n. sp. — Oblong oval, castaneous or piceous, feebly shining, 

 sparsely pubescent. Head and thorax moderately densely and coarsely punc- 

 tured. Thorax less than twice as wide as long, slightly narrower in front, 

 apex feebly emarginate, base very feebly arcuate, sides moderately arcuate, 

 narrowly margined, finely fimbriate, hind angles obtuse. Elytra as wide as 

 the thorax, and more than twice as long, one-third longer than wide, sides 

 very feebly arcuate, apex feebly truncate, surface less densely punctured 

 than the thorax. Body beneath sparsely punctate. Length ,12 — .16 inch; 

 3—4 mm. (PI. Ill, fig. 25). 



The anterior tibias have the outer apical angle prolonged and 

 bidentate, the posterior edge of the apical margin with three or four 

 stout spines; the outer edge has two acute teeth near the middle. 

 The middle tibiee are furnished with stout spines arranged in a 

 double series, two near the tip longer, the tip is also spinulose. The 

 posterior tibia is like the middle. 



This insect occurs from San Francisco northward to Oregon and 

 Western Nevada. There is also a specimen in Dr. Leconte's cabinet 

 labelled Greorgia. 



POCADIUS Erichs. 



Labrum moderately prominent, bilobed. Front prolonged at middle, 

 feebly emarginate. Antennal club oval, three-jointed, grooves deep 

 and slightly convergent. Presternum convex between the coxse, tip 

 with conical protuberance, mesosternum not carinate. Tibiae rather 

 slender, the outer apical angle of all spiuiform, the middle and pos- 

 terior ciliate externally and with a few spinules. Tarsi slender on all 

 the feet, the claws simple. 



The males have a small additional segment. 



The simple tarsi will distinguish this genus from any other with 

 the protuberant prosteruum. 



Two species occur in our fauna. 



Thorax narrowly margined. Ferruginous helTOlns. 



Thorax widely margined. Black, disc of elytra ferruginous dorsalis. 



P. helvolilS Erichs. — Broadly oval, robust, ferruginous, elytra sometimes 

 darker at sides and apex, sparsely pubescent. Head coarsely irregularly 

 punctured, front transversely impressed. Antennse rufous. Thorax more than 

 twice as wide as long, narrowed in front, apex emarginate, base arcuate, 

 slightly sinuate each side, sides moderately arcuate, narrowly margined, disc 



