Casey — A Revision of the American Paederini. 203 
species, which are both represented by good series. In the 
type specimen of punctatus there is a small and feeble 
tumidity on the surface between the gular sutures just behind 
the support of the mentum, which is probably homologous 
with the subspiniform process, in the same position, generally 
characterizing Pycnorus; it seems to be an inconstant charac- 
ter in Pycnorus and is extremely rare in Orus and probably 
of sporadic or accidental occurrence, as I have only noticed it 
_in this single specimen out of many examined. 
Scopaeus Er. . 
Renewed comparisons of the European and American 
species — the latter separated by the writer under the name , 
Leptorus,— impels him to reverse his former opinion and to 
unite these with Scopaeus. The genus Scopaeus will thus 
include all the European Scopaei and the equally numerous 
American species, as described in the table given below, as 
well as a number of Mexican and Central American species 
made known by Dr. Sharp; possibly also many forms inhabit- 
ing other parts of the world. Thus extended in geographical 
distribution, as well as numbers, some variability in generic 
characters might be anticipated but this seems to be com- 
paratively unimportant. The European species are more 
linear and parallel, with less apical anterior thoracic angles, 
as a rule, than the American and with the suture separating 
the pronotal hypomera better developed; in addition the 
basal joint of the hind tarsi is generally more decidedly longer 
than the second. In the American species the basal joint is 
usually subequal to the second, but in pictpes it is notably 
longer than the second as in the European forms, and, in at 
least one European species before me, the two basal joints 
are equal. The sculpture of the European species is generally 
coarser and less dense than that of the American, but I can 
find no character of sufficient importance or constancy to 
warrant generic separation. The large spongy-pubescent 
fovea immediately above each eye is present throughout but 
rather more developed in the European species. It is singular 
