114 AMERICAN COLEOPTERA. 



equal ; sides parallel, scarcely at all prominent at the middle; dorsal line nearly 

 complete. Elytra strongly, longitudinally convex: humeri entirely wanting; 

 sides evenly arcuate; intervals flat, twice as wide as the striie. Length 2 mm. ; 

 .08 inch. (PI. II, figs. 2 and 2a). 



Described from a .single female from Mississippi in Mr. Wiekham's 

 collection. Again closely allied to erraticum and agreeing with it 

 in such points of detail as are not mentioned in the above short 

 description. It is, however, clearly distinct by its shorter, much 

 more longitudinally, convex elytra, complete absence of humeri 

 and square thorax. 



4. A. prutensiiiil Lee. — Black, sparsely pubescent. BeJik moderately arcu- 

 ate, a little longer than the head and prothorax.strigose and moderately coarsely 

 but somewhat vaguely punctate throughout its length. First joint of antennae 

 as long as the next two, united ; second scarcely reaching the eye. Eyes not very 

 prominent. Prothorax a little longer than wide, the base distinctly wider than 

 the apex; sides very feebly arcuate and subparallel in basal two-thirds; surface 

 rather densely punctate; dorsal line nearly complete. Elytra regularly oval, 

 widest almost exactly at the middle; humeri scarcely evident. Abdomen coarsely, 

 deeply, closely punctate. Length about 2 mm. ; .08 inch. 



Hah. — California (San Francisco). 



This species is represented only by the type in the LeConte cabi- 

 net, from which the above short diagnosis is drawn. It is a female 

 and has the tips of the elytra somewhat produced. It is one of a 

 small numl)er of species having the abdomen coar.sely, closely punc- 

 tate, from all of which the characters in the table should readily 

 separate it. The form of the elyti'a — widest at the middle — is an 

 unusual character in this group. 



5. A. iiupiiiictistriatuin Smith. — Elongate, black, shining; pubescence 

 almost wanting. Beak ( 'Jj ) a little shorter than the head and prothorax, moder- 

 ately stout for this section, not strongly arcuate, cylindrical, noticeably dilated at 

 basal third, strigose and with a few fine punctures, except at the apex, which 

 is more or less polished ; ( 9 ) much longer, very slender, not dilated. Antennae 

 slender, first joint equal to the next two [%), or three (9), second, third and 

 fourth joints very slightly decreasing in length ; second reaching the eye. 

 Front more or less canaliculose ; eyes rather prominent. Prothorax longer than 

 wide ; base a little wider than the apex ; sides moderately dilated at the middle ; 

 dorsal line complete; punctuation moderately dense. Elytra rather broadly 

 ovate, widest near the middle; humeri and posthumeral sinuation well marked ; 

 intervals flat or nearly so, twice as wide as the striae. Beneath coarsely, clo.sely 

 punctate. Length 2-2.2 mm. ; .08-.09 inch. (PI. II, figs. .3, 3a, 5 and 19). 



%. Sutural angles rounded, second antennal joint setiferous; anterior tibiae 

 more suddenly widened; femoral tubercle prominent; smooth area closely striate; 

 limiting ridge not very strong; middle and hind tibiae with small mucro ; metas- 

 ternal si)icules moderate. 



9 . Sutural angles produced; other parts unmodified. 



Hub. — Western Penn.sylvunia (Hamilton), Ohio, Illinois, Texas. 



