28 AMERICAN COLEOPTERA. 



apex. The surface is shining and the elytra usually have a more or 

 less distinct metallic lustre. 



In the females the surface, which is finely alutaceous, is less dis- 

 tinctly or not at all metallic. 



From the three preceding species it is distinct by its more parallel 

 form and proportionally longer elytra. From cylindrica it is recog- 

 nizable by the characters given in the table. 



Its distribution is distinctly northern. Specimens have been seen 

 from Newfoundland, Hudson Bay, Ft. Simpson, Great Slave Lake, 

 Alberta, Assiniboia, Manitoba, the north shore of Lake Superior, 

 Bayfield, Wisconsin, Spirit Lake, Iowa, Volga, South Dakota, 

 Montana, Wyoming and Greeley, Coloi'ado. 



11. A. cylindrica Lee. — Form nearly oblong, elongate, convex. Color 

 piceous or nearly black, sliiniiig. Head as wide as the thorax at apex ; frontal 

 grooves moderately deep, anteriorly not extending on to the epistoma ; antennse 

 slender, scarcely as long as the head and thorax, rufous; palpi rufous. Prothorax 

 subquadrate, less than one-half wider than long, as wide at base as apex, widest 

 at middle, slightly emargiuate at apex, subtruncate at base; anteiior angles 

 rounded, slightly prominent; apex impunctate; base punctate; transverse im- 

 pressions nearly obsolete; median line fine, entire, or but slightly abbreviated in 

 front; basal impressions deep, very distinctly bifoveate; sides arcuate nearly to 

 base, sinuate immediately in front of the hind angles, which are rectangulai-. 

 .slightly prominent and carinate. Elytra together scarcely wider than the 

 thorax and less than twice as long as wide, convex, deeply striate; striiE entire, 

 finely punctate to behind the middle, the scutellar stria long, the eighth with the 

 row of ocellate punctures very widely interrupted at middle; intervals slightly 

 convex. Body beneath piceous or rufopiceous; metasternal episterna, sides of 

 metasternum and of the first two ventral segments sparsely punctured. Legs 

 rufous or rufopiceous; iuner margin of the middle and posterior femora with 

 two setigerous punctures; posterior tarsi with the three basal joints slightly 

 grooved on the outer side. Length .37-. 44 inch ; 9.25-1] mm. 



In the males the upper tooth of the middle tibiae is distinctly 

 below the middle and prominent; the lower tooth is small and situ- 

 ated al)out half way between it and the apex. 



The fenudes have the surface finely alutaceous. 



Its form is more convex than that of rufimaitd, with the elvtra 

 at most scarcely flattened on the disk. The carina at the hind 

 angles of the thorax is less acute than in rnjhnana. The three basal 

 joints of the hind tarsi are grooved on the outer side as in esch- 

 scholtzi and melanogastrica, and by this character, as well as bv its 

 form and the less acutely carinate hind angles of the thorax, it 

 seems to lead towards these last named species. 



