144 GEO. H. HORN, M. D. 



to viridicollis with the rugre more distinct and the punctures more numerous 

 extending on the disc. Elytra about one-fourth longer than wide, not narrowed 

 at base, surface striate, the striee moderately impressed on the disc and distinctly 

 punctate, intervals slightly convex and sparsely punctulate. Body winged, be- 

 neath smooth sparsely punctate at sides of pro- and metasterna. Length .30 — 

 .32 inch ; 7.5—8 mm. 



Male. — Tarsal characters as in viridicollis. Anal segment with a very feeble 

 emargination at middle and bisetose each side. 



Female. — As in viridicollis. 



In the " List of the Coleoptera of North America," Dr. LeConte places 

 this species as a variety of purpurea Say, which is by Say's description 

 a true Callida. Chaudoir having confused the matter by considering 

 purpurea, viridicollis and amoena synonymous, gave a new name to 

 the present species, which any one would recognize as distinct from 

 viridicollis, and called it Horni. It bears a very close resemblance to 

 Callida purpurea Say, but the latter has the bilobed fourth tarsal joint 

 and an obtuse mentum tooth. 



This species occurs from Kansas through Utah and Nevada to 

 California. 



P. viridis Dej. — Color uniformly blue or green, more or less metallic. Front 

 broadly impressed and punctured each side, vertex smooth, occiput very sparsely 

 punctured. Antennae piceous, three basal joints pale. Thorax broader than long, 

 somewhat cordiform, sides arcuate in front, distinctly sinuate posteriorly, hind 

 angles subacute, somewhat prominent, sculpture similar to viridicollis but much 

 smoother on the disc. Elytra very little longer than wide posteriorly, narrowed 

 at base, disc with impressed, finely punctured striae, the intervals flat with 

 rather coarse but irregularly placed punctures. Body apterous, beneath some- 

 what wrinkled but without punctures. Legs black with slight purple tinge. 

 Length .30 inch ; 7.5 mm. 



Male. — Sexual characters of amcena. 



Female. — Unknown. 



I have never seen but one specimen of this insect collected in 

 Oregon by the late W. M. Gabb. It resembles amoena but differs in 

 its more distinctly cordiform thorax, the form of the elytra And the 

 apterous body. 



Chaudoir appears to have been more fortunate in obtaining speci- 

 mens as he mentions variations of color from blue and green to 

 nearly black. 



P. cast ail ea n. sp. — Castaneous, moderately shining. Front with a feeble 

 depression each side with few punctures, vertex smooth, occiput very sparsely 

 punctulate. Antenna piceo-testaceous. Thorax broader than long, somewhat 

 cordate, sides strongly arcuate in front, sinuate posteriorly, hind angles sharply 

 rectangular, disc moderately convex, median line finely impressed, apical line 

 obsolete, surface punctured along the apex base and sides, the latter somewhat 

 wrinkled, middle of disc sparsely punctulate or nearly smooth. Elytra about 



