158 NORTH AMERICAN 



4. A. croeeatlis n. sp. (Fauvel MS.)- — Form very moderately robust. 

 Pubescence abundant, close, sub-recumbent, very coarse, cinereous, rather 

 long, much finer, more recumbent, and less conspicuous on the abdomen. 

 Head moderate, twice as wide as long; interocular surface twice as wide as 

 the eye, very feebly convex, very feebly bisulcate ; punctures rather coarse, 

 somewhat evenly distributed, slightly irregular in shape, deeply impressed, 

 interspaces nearly flat, varying from one-third to twice the width of the 

 punctures, polished ; ocular lines meeting at about two lengths in advance ; 

 antennae as long as the width of head, robust, basal joint fusco-pioeous, 

 remainder rlavo-testaceous, club strong ; third joint one-half longer than the 

 fourth, fourth and fifth equal in length ; sixth and seventh equal, eighth 

 slightly shorter, joints of club nearly equal in length, tenth most robust and 

 slightly transverse ; maxillary palpi rather long, pale flavate throughout. 

 Prothorax nearly one-eighth longer than wide ; sides for three-fifths the 

 length from the apical angles parallel and feebly convex, thence moderately 

 convergent posteriorly and very feebly sinuate ; anterior margin distinctly 

 longer than the posterior, the former feebly arcuate, the latter transverse; 

 surface very feebly tuberculate near the basal angles ; punctures rather 

 small, round, rather sparse, somewhat unevenly distributed, deeply im- 

 pressed ; interspaces nearly flat, shining. Elytra at base scarcely one-eighth 

 wider than the pronotum ; sides moderately divergent posteriorly, nearly 

 two-fifths longer than the width at base, almost straight ; together broadly, 

 roundly, and rather strongly emarginate behind; suture one-third longer 

 than the pronotum; surface very feebly impressed along the suture ; punc- 

 tures rather small, evenly distributed, round, moderately impressed ; inter- 

 spaces wider than the punctures, nearly flat, polished. First three abdominal 

 segments of nearly equal width, somewhat narrower than the contiguous 

 elytra; border strong, decreasing in width posteriorly; surface very finely, 

 feebly, evenly, and closely punctulate, shining ; transverse carinae not 

 ensued. Legs slender, fiavate, with the exception of the distal end of the 

 femora and the base of the tibiae, which are dark piceous, tarsi short and 

 robust ; first three joints of the posterior decreasing nearly uniformly in 

 length, fifth nearly as long as the first two together ; third and fourth strongly 

 bilobed. 



Male. — Sixth ventral segment deeply sinuate at apex, sinus occupying 

 nearly the entire apex, nearly in the form of a triangular incisure with the 

 angle broadly rounded, about twice as wide as deep ; seventh segment broadly, 

 roundly, and rather strongly emarginate at tip. 



Female. — Sixth segment narrow, angulate at tip. 



Length 3.7-4.5 mm. 



Nebraska, 13; Detroit, Michigan, ol ; Marquette, Lake Superior, 

 2; Long Island, 2 ; District of Columbia, o. 



A very abundant and well-marked species, having a wide range of 

 distribution. 



5. A. adveiia n. sp. — Form sub-cylindrical, somewhat robust. Pubes- 

 cence coarse, abundant, rather long, sub-recumbent, cinereous. Head small, 



