208 GEO. H. HORN, M. D. 



Last ventral extremely feebly emarginate, and with a long triangular 

 smooth space iiigritiilus. 



Last ventral of male apparently not emarginate (the emargination is small, 

 triangular and closed by a translucent pseudomembrane). 



decipiens. 

 Dorsal punctures six, arranged in a sigmoid series. 



Antenna; as long as the head and thorax, the joints all as long or longer tlian wide. 

 Last ventral of male with a rather large triangular emargination. 



albionicus. 



Last ventral of male extremely feebly emarginate instabilis. 



Antennse shorter than the head and thorax, the o)iter joints quite transverse. 



picicoriiis. 

 P, cyaiii|><'niiis Fab. — Large, form moderately elongate, black, shining; 

 elytra bright blue; antennse black, not longer than the head and thorax, joints 

 7-10 as broad as long ; head large, quadrate, broader than long, larger in the male, 

 hind angles sparsely punctate ; thorax oval, broader than long, not wider than the 

 head % , slightly narrower in front, dorsal punctures three, large; elytra very lit- 

 tle wider than the thorax, conjointly broader than long, coarsely, moderately 

 closely punctate, sparsely black pubescent; abdomen iridescent, more coarsely but 

 less closely punctured than the elytra ; beneath coarsely and moderately closely 

 punctured on the basal segments. Length .48— .60 inch; 12—1.5 mm. 

 Mn/e.— Tarsi all filiform; last ventral broadly triangularly emarginate. 

 Female. — Tarsi filiform; last ventral entire. 



This species is one of the laruest in our fauna, and is conspicuous by 

 its bright blue elytra. 



Occurs in Europe and the entire eastern United States. I have not 

 seen it from west of Kentucky. 



1*. blaudus Grav. — Black, basal half of abdomen and legs reddish testaceous 

 antennae piceous, not longer than the head and thorax, joints 6-10 as wide as long; 

 head sub-quadrate, not narrowed behind the eyes, hind angles not punctate ; thorax 

 scarcely larger than the head, longer than wide, not narrowed in front; sides dis- 

 tinctly sinuate, dorsal punctures three, equidistant ; elytra wider than the thorax, 

 conjointly as long as wide; surface very shining, sparsely punctate and sparsely 

 hairy; abdomen very sparsely punctate, the punctures finer than on the elytra; 

 beneath very sparsely punctate and shining, punctures coarser than above; legs 

 and coxae rufo-testaceous. Length .20 — .22 inch ; 5 — 5.5 mm. 



Jfa/e.— Tarsi filiform; last ventral truncate, with a triangular impression. 



Female. — Tarsi filiform ; last ventral entire. 



While the thorax is nominally tripunctate, I have seen a specimen 

 symmetrically quadripunctate on each side, the additional puncture being 

 between the first and second of the normal series The last segment of 

 the male abdomen appears to be triangularly emarginate with the notch 

 closed by a transparent membrane. 



This species resembles Isetulus of series A, and is known by the male 

 characters and entirely pale legs. 



Occurs from Canada to Virginia and Illintds. 



