138 AMERICAN COLEOPTERA. 



the posterior transverse groove deep; surface closely rngosely punctate on the 

 convex portion of the disk, the side margin and transverse groove nearly smooth. 

 Elytra about one-fourth or one-fifth wider than the prothorax, margin obtusely 

 angulate at the humeri, and very broadly subangulate before the middle; each 

 with eight rows of moderately coarse and deep punctures; intervals 3 5-7 dis- 

 tinctly but not strongly costate ; a transverse lateral impression just before the 

 middle. Lower surface subimpunctate ; metasternum profoundly bi-impressed ; 

 middle coxae separated by about one-half the coxal width, front coxa? distinctly 

 but less widely separated. (PI. IV, fig. 31). Length 1-1.5 mm. 



Hab. — Massachusetts, Lowell — "in cellar" (Blanchard) ; Law- 

 rence— "in powdered lobelia root" and "with Sitodrepa in dande- 

 lion root" (King); Pennsylvania — Horn collection; Michigan — 

 Detroit (Hubbard and Schwarz). 



In some examples the median line of the metasternum and abdo- 

 men bears a moderate number of long, curved, snberect. pale yel- 

 lowish hairs; in other specimens there is no sign of these hairs, and 

 it is therefore probable that it is a male character. The identifica- 

 tion of our specimens is established by comparison with a typical 

 example of costulata received from Reitter. It has been previously 

 known from Germany and Japan. 



C filiformis Gyll. — Linear, subdepressed, rufotestaceous. Head subtrian- 

 gular, evenly convex, finely, closely punctate; epistoma moderately dilated at 

 sides, labrum feebly emarginate ; eyes very small, distant from the posterior 

 angles. Antenna? shorter than the head and prothorax ; first joint large, orbicu- 

 lar; second narrower, broadly oval ; joints 3-8 smaller, equal in width, submonili- 

 form ; club abruptly 3-joiuted, first two joints as wide as long or a little trans- 

 verse. Prothorax about one-half wider than the head, transverse, narrowed 

 behind, sides rounded anteriorly, faintly sinuate posteriorly; side margins ex- 

 planate ; disk convex, without anterior fovea, posterior transverse, groove deep. 

 Elytra elongate, subparallel, but little wider than the thorax, humeral angles 

 right; each with eight rows of coarse punctures at base, and seven posteriorly, 

 the fifth and sixth rows coalescent before the middle; a faint transverse impres- 

 sion—more distant laterally — just before the middle. Mentum, prosternum in 

 front, and metasternum at middle distinctly punctate; abdomen impunctate. 

 Metasternum with a deep fovea each side, connected by a deep groove. (PI. IV, 

 fig. 321. Length 1.2-1.4 mm. 



Hub. — Pennsylvania (Philadelphia; Allegheny); Michigan (De- 

 troit); Missouri. 



I have seen very few native specimens, most of those bearing the 

 name of flliformis in our collections being either costulata or filum. 

 It is common throughout Europe. Belon states that the front and 

 middle tibia? are a little arcuate in the male; the difference between 

 the sexes in this respect must be verj slight I think, at least it is 

 scarcely obvious in the specimens at hand. 



