20 HETEROMERA. [ Gnathocerus. 
maxillary palpi is somewhat securiform ; the eyes are almost entirely 
divided ; the antenne are short, and gradually thickened towards apex ; 
the general form is elongate oblong, and the elytra are much depressed ; 
the genus contains three or four species from Europe, the Isle of France, 
and North America; they feed on meal and bran. 
G. cornutus, F. (Uloma cornuta, Steph.). Oblong, elongate, but 
broader than Z'ribolium, which it much resembles, depressed, of a red- 
dish-brown colour; thorax quadrate, gradually and slightly narrowed 
behind, with the posterior angles prominent and a small impression on 
each side at base, very finely punctured ; elytra with fine punctured 
strie, interstices minutely and closely punctured; antenne and legs red. 
L. 3-4 mm. 
Male with the mandibles very large and prominent, recurved and acute 
at the tip, resembling horns, margins of clypeus dilated, vertex with two 
small short horns. 
In flour, bread, &c. ; often seen crawling about bakers’ shops; a cosmopolitan 
species ; not uncommon; London; Norwich; Dover; Hastings; Hampshire; Bir- 
mingham ; Scarborough; Manchester; Northumberland and Durham district, 
common ; not recorded from Scotland, but it probably occurs. 
The v. leviusculus, Steph., is paler, with the thorax less quadrate and 
the punctuation more minute, 
TRIBOLIUM, McLeay. 
This genus contains about half-a-dozen species, one or two of which 
are almost cosmopolitan, having been imported into various countries in 
meal and flour ; they are small, elongate-oblong, and depressed insects 
with the mandibles simple, and the last joint of the maxillary palpi long 
oval; the eyes are about half divided; the antennze are more or less 
thickened towards apex, and the elytra, as in the preceding genus, com- 
pletely cover the abdomen. 
The larva and pupa of 7. ferrugineum are described and figured by Schiddte (l.c. 
pp. 563, 587, pl. x. figs. 18 and 21); the larva is linear and parallel, slightly nar- 
rowed towards apex, of a rufo-ferruginous colour above and paler below; the seg- 
ments are furnished on each side with setze, and the anal segment is very small and 
terminates in two short pointed appendages ; the pupa is much longer than broad, 
and is set with rather short setee; the plates at the side are strongly bifid, and the 
cerci are comparatively long and sharply pointed at apex. 
J. Antenne with the three last joints distinctly larger, form- 
ing ayclubyje., Seed ee. Serres isin : : 
II, Antenne gradually narrowed to apex . 
T. FERRUGINEUM, F. 
. . T. conFosum, Duv. 
T. ferrugineum, F. (castaneum, Herbst.; Stene ferrugineum, 
Kirby). Elongate-oblong, parallel, depressed, reddish-yellow-brown or 
rufo-ferruginous ; head and thorax thickly and finely punctured, the 
former large, but much narrower than thorax, the latter broader than 
long, with the sides subparallel; antenne ferruginous, with the three 
