20 HETEROMERA. \_Gna11ioccrus, 



maxillary palpi is somewhat securiform ; the eyes are almost entirely 

 divided ; the antennae 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 T-riboUum, 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 

 striae, interstices minutely and closely punctured ; antennae 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 cosmopolitiin 

 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. Iceviusculus, Steph., is paler, with the thorax less quadrate and 

 the punctuation more minute. 



TRZBOZiZUM, 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 antennae 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 T. ferrugineum are described and figured by Schiodte (I.e. 

 pp. 563, 587, pi. 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 setae, 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 setse; the plates at the side are strongly bifid, and the 

 cerci are comparatively long and sharply pointed at apex. 



I. Antennso with the three last joints distinctly larger, form- 

 ing a club T. FEEEUGTNEUM, F. 



II. Autennse gradually narrowed to apex T. CONFDSUM, Duv. 



T. ferrugrineum, 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 ; antennae ferruginous, with the three 



