Horn.] J-'t) [Nov. 5, 



Male. Anterior tarsi dilated, tlie first four joints densely pubescent 

 beneatli. Middle tarsi dilated, the first joint pubescent over its entire sur- 

 face, the next three densely pubescent. 



Female. Tarsi slender, not pubescent beneath. 

 The clypeus has but one setigerous puncture on each side. 

 One species occurs in our fauna : 

 Thorax as wide at base as apex, hind angles rounded, intervals of elytra 

 alternately with coarser punctures, irregularly placed. Femora black, 

 tibiae and tarsi pale 31. sericeus Harr. 



31. A. sericeus Harris. Oblong, black, opaque. Head sparsely punc- 

 tate. Antennae rufous. Thorax broader than long, apex and base equal, 

 sides regularly arcuate, hind angles rounded, disc feebly convex, surface 

 sparsely punctate, more densely at base and near the sides. Elytra striate, 

 intervals slightly convex, densely punctulate, each puncture with a short 

 hair, apex sinuate, the alternate intervals with coarser obsolete punctures. 

 Body beneath black, opaque. Femora piceous, tibiae and tarsi pale. 

 Length .40 inch ; 10 mm. 



The anterior and middle tarsi of the male are dilated, the first four joints 

 pubescent, the first joint over nearly its entire surface. In the female these 

 tarsi are slender. 



Canada and Middle States to Nebraska. 



In addition to the species described in the foregoing pages the following 

 has been described : 



DicTiirus pallidus Motsch. Elongatus, parallel us, pallidus ; capite, 

 thorace elytrorumqxie medio infuscatis ; mandibulis robustis ; thorace sub- 

 quadrato, postice angustato, angulis posticis obtusis ; elytris thorace duplo- 

 longioribus, striatis, interstitiis impunctatis ; pedibus ciliatis. Long 2^1in. 

 — lat. 1 lin. 



In addition the following characters are given : 



There is no punctuation nor pubescence on the upper side of the body. 

 The thorax is square, narrowed behind, the surface transversel}'' rugulose. 

 On each side of the base is a rounded shallow impression. 



These characters seem to indicate that the species is not a BicMrus 

 (group A — a) but that it is probably more closely allied to and possibly 

 merely an immature form of A. 'pityclirous Lee. 



It occurs in California. 



Synonymy and Bibliography. 



A. strenuus Horn, *Trans. Am, Ent. Soc, 1868, p. 130. 



A. dilatatus Dej., Species iv, p. 241. 



Mrsutus Men., Bull. Ac. Petrop., ii, 1844, p. 61. 

 A. obtusus Lee.,* Ann. Lye, v, p. 185. 

 A. pilosus, n. sp.* 

 A. Jmmanis, n. sp.* 

 A. brunneus Dej.,* Species iv, p. 239. 



