114 AMERICAN COLEOPTERA 



tenure with 2-jointed club, and erects a new genus — Metatypus -to 

 contain a small number having the antennae 11-jointed with 3-jointed 

 club. Following this method of division with our species, omen- 

 canw would be a Metophthalmus, trux, null* and albonotatus would 

 fall in Metatypus, while parvlceps with its 10-jointed antennae and 

 3-jointed club would have to have another genus established for its 

 reception. Such a procedure, however, would be entirely unwar- 

 ranted, and in view of the striking uniformity in every other signifi- 

 cant detail of both structure and faeies, it is difficult to hud an 

 excuse for even subgeneric titles Indeed, the course here pursued 

 by Mr. Belon appears to be quite the opposite to that followed else- 

 where in similar cases, and if we would be consistent Metatypus 

 must, I think, share the fate of Tomyrium, Tocalium, Calyptobium 

 and others. 



Our five species are easily separable as follows: 



Antennae 10-jointed. 

 Head broader, sides of prothorax not distinctly angulate at middle, humeri 



subdentiform parviceps. 



Head narrower, sides of prothorax angulate, humeri rounded -americauuK. 

 Antenna' 11-jointed. 



Elytra with eight rows of punctures riuli*. 



Elytra with six rows of punctures. 

 Size larger, elytra at base wider than the contiguous base of the prothorax. 



trux. 

 Size smaller, elytra at base equal in width to the contiguous base of prothorax. 



albosignatus. 



JI. |>arvi«'e|>* Lee. — Ferruginous. Head wider than long, sides strongly 

 rounded, distinctly serrulate. Antennas 10-jointed. club 3-jointed. Prothorax 

 nearly one-half wider than long; sides usually broadly rounded at the middle, 

 a little more strongly convergent before than behind, margin serrulate; disk 

 with the usual sculpture, viz.: transversely trifoveate on the anterior half, the 

 lateral fovea- larger and more vague than the intermediate one ; rather deeply 

 transversely sulcate posteriorly; the sides of the median fovea are more or less 

 elevated anteriorly, and these with two more approximate tubercles at the middle 

 of the base are usually the only portions of the disk not concealed by the ciyp- 

 togamic indument. Elytra wider at base than the contiguous base of the pro- 

 thorax, the humeral angles subdentiform and crenulate for a short distance, sides 

 not or scarcely perceptibly angulate; disk of each with six series of large fovei- 

 form punctures, the intervals very narrow ami alternately a little more promi- 

 nent. Front coxa- separated by about half the coxal width, middle coxa- by the 

 coxal width. (PI. Ill, figs. 6 and 6a). Length 1-1.2 mm. 



Hab. — Described by LeConte from a single specimen taken at 

 San Jose, Cal. The five specimens now before me are from Alameda 

 and San Mateo, some forty miles farther north. 



