54 JOHN B. SMITH. 



Slighter than its allies ; opaque and not at all shining. The rostrum 

 differs somewhat in form, being in some specimens almost equal, or even 

 at first sight appearing slightly dilated at tip, but it is always robust and 

 punctuate, and in the majority of specimens it is gradually and slightly 

 attenuated to tip. 



A, COrdatlim n. sp. — Black, moderately pubescent ; form elongate. Head 

 elongate, rugose; distinctly suleate between the eyes; the latter moderate and not 

 prominent; antennae moderate; basal joint slightly exceeding second, but more 

 slender. Thorax flattened above, decidedly widest behind middle, and much con- 

 stricted at base: sides somewhat acutely produced behind middle, densely and 

 irregularly punctured, a deeper foveate line near base. Elytra fully one-half 

 longer than wide ; sides parallel ; striae deep, punctures distinct, intervals flat and 

 finely punctured. Beneath moderately punctured. Length 2 mm. 



Hah. — California. 



The strongly constricted thorax renders this species peculiar, and its 

 recognition ea.sy ; the rostrum is only moderately attenuated toward tip, 

 and is rather longer than usual in this section. Only a single specimen, 

 Coll. Dr. Leconte. 



A. capitatum n. sp. — Black, not at all pubescent.- Head narrow, small, 

 finely and densely punctured ; eyes not prominent. Thorax not much wider at 

 middle than at base, densely and irregularly punctured, with an indistinct longi- 

 tudinal line most evident at base. Elytra broadly ovate, widest about middle, 

 scarcely one-half longer than wide, humeri broad; striae narrow, punctures dis- 

 tinct, intervals moderate, flat. Length 1.5 — 1.75 mm. 



Hah. — Mich., Neb., Oregon. 



Easily distinguished from the preceding by the lack of pubescence, 

 and by the form of the thorax. 



A. oblituin n. sp.— Black, form moderate. Head transverse, rather sparsely 

 punctured; eyes distinct, and somewhat prominent; distinctly so in some speci- 

 mens; rostrum unusually slender for this section, distinctly dilated near base; 

 antennae moderate, inserted one-third from base of rostrum. Thorax transverse, 

 widest at base, sides arquate, or rounded; coarsely punctured, and with a deep 

 foveate elongate puncture near base. Elytra moderate ovate : striae distinct, punc- 

 tures large, intervals wide, and somewhat convex, shining. Beneath rather finely 

 and sparsely punctured. Length 1.5 — 2 mm. 



Hah.— Col, CaL, Texas, Kan., Fla. 



Distinguished by the form of thorax ; bears a superficial resemblance 

 to antennatum, and has the same general form of body. 



Section IV. 



The species of this section are by all odds the most numerous, and 



there are several distinct forms indicated, which I use to form groups of 



closely allied species. All of the species hav« the thorax as wide at base 



as at middle, or it is widest at base with the angles acute ; they are 



