Casey — A Revision of the American Paederini. 31 
forming a coarse and cleft-like stria extending to the extreme 
base of the head, and more densely pubescent or setulose third 
palpal joint, are characters which isolate this genus com- 
pletely, and it is without any very close allies known to me. 
The general habitus of Monocrypia is however not unlike that 
of several of our common forms of Hesperobium. The gen- 
eric diagnosis is taken from the Japanese Cryptobium apica- 
tum and pectorale, of Sharp. 
Gastrolobium n. gen. 
This is by far the most extensive and widely distributed 
genus of the American Cryptobia and includes some of the 
largest species. It is abundantly represented in temperate 
and tropical North and South America but has not yet 
occurred in the true Pacific coast fauna of North America, 
a significant fact when comparing the American and Asiatic 
types of the subtribe. The elytral punctures generally have 
but feeble indication of serial order, but in some cases, such as 
lugubre, the series are almost perfectly regular, constituting 
one of the most conspicuous features. The basal joint of the 
antennae is only moderately long when compared with other 
genera of the subtribe, being greatly surpassed in length by 
Hesperobium and, to a still greater degree, by Lissobiops in 
that respect. The male sexual characters are more elaborate 
than perhaps anywhere else in the Paederini, and the lobation 
of the third ventral segment is a character distinctive of, if 
not peculiar to, this genus. In at least one Amazonian species 
this singular lobe is strongly bilobed and there are doubtless 
many other remarkable modifications. The hind trochanters 
in the male of another species brought home from Brazil by 
Mr. H. H. Smith, are greatly prolonged and spiculiform, but 
I have remarked no such sexual character among our species. 
The lobe of the third ventral* is not constant in size but 
* This is described as the fourth segment by Dr. Horn in his revision of 
Cryptobium (Tr. Am. Ent. Soc., XII), he having mistaken the elevated basal 
margin of the first segment for a basal segment partially concealed by the 
coxae, and all the figures of the plates accompanying that paper are erro- 
neously drawn in this respect. As illustrating the true structure of the 
