H. C FALL. 113 



Table of Genera. 



Pronotum with dorsal costse. 



Eyes entirely superior ; elytra connate MetopllthalnillS. 



Eyes lateral ; elytra not connate. 



Presternum not reaching the posterior border of the prothorax, the epimera 



coalesc.ent on the median line Lathridius. 



Prosternum reaching the hind margin of the prothorax, separating the epi- 

 mera Con i nonius. 



Pronotum without dorsal costae. 

 Elytra not connate. 



Eyes large, not very distant from the antennae, scutellum distinct. 



Enicmus. 

 Eyes small or minute, remote from the antennae; scutellum indistinct. 

 Trochanters normal. 



Middle coxae not contiguous Cartodere. 



Middle coxae contiguous Adistemia. 



Trochanters long, cylindrical Belonia. 



Elytra connate Revelieria. 



METOPHTHALMIS Woll. 



Body minute, subdepressed, glabrous; pronotum foveate and sili- 

 cate; elytra with six or eight series of large foveiform punctures. 

 Head bicostate, sides with broad flattened margin ; eyes very small, 

 composed of few lenses, widely distant from the antenna? and entirely 

 superior. Antenna? 9-11 jointed, club 2 or 3-jointed (3-jointed in 

 all our species). Margins of head, thorax and often of the humeri 

 finely serrulate or crenulate. Scutellum wanting ; wings obsolete. 

 Coxa? more or less separated ; abdomen with five segments, the first 

 nearly or quite as long at middle as the two following united. Legs 

 rather short; femora moderately stout; tibiae straight, gradually 

 broader toward the apex ; tarsi with the first two joints nearly equal 

 in length, third equal to the first two together; claws simple. 



The species of this genus possess a very uniform and characteris- 

 tic facies, which renders them at once recognizable. Unless secured 

 immediately after disclosure from the pupae, more or less of the 

 pronotum, under surface, and in certain species, of the elytra, is 

 usually covered with a chalk-like indument composed of crypto- 

 Lia mic dust or debris, which it is difficult to remove. The presence 

 or absence of this indument must, in the nature of things, be in 

 some degree fortuitous, and in only one of our species — albos ig- 

 natus — is its disposition so constantly peculiar as to warrant its use 

 as a specific character. In the Essay already mentioned Mr. Belon 

 restricts Metophthalmus to those species having 9 or 10-jointed an- 



TRANS. AM. ENT. SOC. XXVI. (15; NOVEMBER, 1899. 



