588 Mr. T. Veraon Wollaston 07i the 
Apart from tliese eccentricities of tibi«'\3 and abdomen, 
Xenocncma is remarkable for its rather short and thick, 
but somewhat parallel and depressed, body, — Avhicli is 
densely and sharply sculptm-ed, and of a piceo-ferruginous 
hue ; for its rostrum (which is robust, but not particularly 
abbreviated) being divided by a distinct line (above and 
below) from the forehead ; for its antennas being almost 
medial as regards their insertion ; for its eyes being pro- 
minent ; for its prothorax being large, elongate, and sub- 
quadrangular ; and for the very unusual sculpture of its 
elytra, — the interstices of which are costiform, each costa 
however being as it were divided into two by a densely 
punctulated central stria. 
115. Stereocorynes {nov. gen.'). — It is the European 
Rhyncolus truncorum, Germ., which has afforded the 
details for the present genus ; and it is surprising to me 
how that remarkably-constructed insect could ever have 
been associated with the R. ater, and the various other 
species on the tnie R]iyncolus-tj\)e. Thus, not only is it 
more strictly cylindrical and obtusely rounded behind, but 
its rostrum and antennas are on a totally different pattern, 
— the former being short and subparallel in the males, but 
still shorter and subtriangular in the females ; Avhilst the 
latter (which are inserted considerably behind the middle) 
are, as compared with those of the RkijncoU, exceedingly 
abbreviated and glabrous, the scape particularly being 
reduced in length, the funiculus-joiuts closely com])acted 
together, and the club solid, compressed, and ob-triangular 
(being straightly truncated at its apex). In other respects 
Stereocorynes is conspicuous for its eyes being extremely 
sunken or depressed (instead of prominent as in R/i>/n~ 
colus) ; for its prothorax being very convex, and quite 
imconstricted in front ; for its femora, particularly the 
front pair, being considerably thickened, and with a faint 
appearance beneath of an obtuse angulifomi tooth ; and 
for its four anterior coxa) being (as in Ile.rarthrum) so 
manifestly more approximated as to be well nigh con- 
tiguous. 
11 G, Hexarthrum ("Wollaston, Ann. Nat. Hist. v. 448. 
IBGO). — The genus Hexarthrum was established by myself 
thirteen years ago for the reception of a RJiyncolus-\\\.e 
insect, with a 6-jointed fluiiculus and subasperated elyti*a, 
wliich had been captured in various houses, and outhouses. 
