14 GEO. H. HORN, M. D. 



The surface being very finely alutaceous, the specimens have at all 

 times a greasy aspect. 



This species has probably been introduced from Europe, but is so 

 widely diffused in our territories, occurring from the Atlantic coast 

 to Colorado and New Mexico. 



A. duplex I^ec. —Oblong, subcylindrical, piceous or brownish, the anterior 

 angles of the thorax paler, legs reddish brown. Antennge brownish, the club 

 piceous. Head spar.sely rather coar.sely punctate, the clyjieus more rugose, front 

 trituberculate. Clypeus hemihexagonal, the sides slightly sinuate, anteriorly 

 broadly truncate and feebly emarginate, the angles much rounded, gense slightly 

 prominent, but very obtu.se, a distinct transverse carina parallel with the front 

 margin. Thorax convex, slightly narrower in front, the sides feebly arcuate, 

 hind angles rounded, base on each side feebly sinuate, punctuation rather coarse 

 and sparse on the disc, denser and finer near the sides. Elytra not wider at 

 base than the thorax, striae rather deep and crenately punctured, intervals 

 slightly convex and with few very fine punctures. Body beneath spar.sely punc- 

 tate and slightly alutaceous, the hind femora very sparsely punctate. First joint 

 of hind tarsus shorter than the next three. Length .16-.18 inch ; 4-4.5 mm. 



The sexual differences are very feeble and consist in the slightly 

 more prominent frontal tubercles, smaller size and narrower form of 

 the male. 



The presence of the transverse clypeal carina is less of a peculiar 

 character than supjwsed by Dr. LeConte. The species looks not 

 unlike some of the smaller forms of granarius. 



Occurs in C/olorado. 



A. pectoi'alis Lee. — Oblong, convex, black, shining, elytra subojiaque with 

 grea.sy aspect. Antennse piceous. Head sparsely punctate, front trituberculate. 

 Clypeus with slight transverse carina, hemihexagonal, at middle feebly emar- 

 ginate, the angles distinct, but not prominent, sides oblique, gense slightly prom- 

 nent, obtuse. Thorax convex, the sides parallel behind, arcuate in front, hind 

 angles distinct, but obtuse; ba-se regularly arcuate, disc sparsely, moderately 

 coar.sely punctate, with finer punctures intermixed. Elytra as wide as the thorax, 

 sides parallel, humeri distinct, disc striate, strise crenately punctured, intervals 

 flat, distinctly, but finely alutaceous, with extremely minute sparse punctures. 

 Body beneath more shining than above, sparsely punctate. Mesosternum opaque, 

 strigose. Posterior femora very sparsely punctate. Legs piceous or black, tarsi 

 ferruginous. Fir.st joint of posterior tarsus as long as the next three. Length 

 .20 inch ; 5 mm. 



The only sexual difference observed in the male is the more evident 

 frontal tubercles. 



This species may be known in the present series by its very black 

 color, the subopaque elytra and the presence of the transverse eleva- 

 tion of the clypeus. 



Occurs in California, Washington Territory and Alaska. 



