HETEROMERA. 19 



much broader than any of the species belonging to the following genera ; 

 the antennae are thickened towards apex; the scntellum is triangular ; 

 the legs are moderately robust, and the anterior tibiae are dilated towards 

 apex ; the last joint of the tarsi is strongly elongate ; the genus contains 

 about twenty species, of which six are found in Europe, and the re- 

 mainder are widely distributed, representatives occurring in Japan, 

 India, Ceylon, the Gaboon district, South America, the Sandwich 

 Islands, &c. 



The larva of AlpJiitobius diaperinits is described and figured by Schiodte (I.e. p. 565, 

 pi. xi. fig. 1) ; in form it very closely resembles that of T. motitor, but has the sides 

 of the segments furnUhed with setae ; the colour is pale ferruginous beneath and fer- 

 ruginous above, with the central part of each segment darker, except in middle ; the 

 larva of A. picevs has the upper surface entirely pale ferruginous; the insects in all 

 their stages live in meal, flour, and bran. 



I. Thorax broadest at about base A. DIAPBRINTTS, Panz. 



II. Thorax broadest at or near middle A. PICECS, 01. 



A. diaperinus, Panz. (mauritanicus, Steph,, Curt., necY.). Ovate, 

 convex, pitchy black above, reddish beneath ; head narrower than 

 thorax, distinctly punctured, antennae short, thickened towards apex, 

 pitchy, with the apex lighter ; thorax transverse, broadest at base, with 

 the sides slightly rounded and gradually narrowed in front, distinctly 

 and not very closely punctured ; scutellum triangular, closely punctured ; 

 elytra with distinct punctured striae, interstices diffusely and rather 

 strongly punctured ; legs ferruginous. L. 5-5| mm. 



In flour, &c. ; probably an introduced species ; not common ; London ; Queen- 

 borough, Kent ; Scarborough ; Northumberland and Durham district ; Scotland, in 

 bakehouses, Solway and Clyde districts. Mr. Bold says that it appears to find a 

 congenial climate in some of the deep hot coal mines of the Northumberland district, 

 where it abounds in the stables, having probably beeu introduced in some of the 

 horses' food. 



A. piceus, 01. (mauritanicus. F., nee Steph. ; fagi, Panz. ; Uloma 

 fagi, Curt.). More oblong than the preceding, and, on the average, 

 smaller, and easily distinguished by the shape of the thorax, which is 

 more transverse with the sides rather strongly rounded and broadest in 

 the middle ; it is also more thickly and strongly punctured ; the elytra 

 are depressed on disc, with the stria? less evident than in the pre- 

 ceding species, and the interstices more closely punctured; legs red. 

 L. 4r|-5 mm. 



In old flour ; probably an introduced species ; rather common ; London district ; 

 Dover; Birmingham district ; Rhyl ; Scarborough; Manchester; Scotland, Sol way 

 district ; it probably occurs in granaries in many other localities. 



GNATHOCERUS, Thunberg. 



The members of this genus are easily distinguished from the allied 

 genera by having each of the mandibles of the male produced into a 

 strong horn, which is curved inwards at apex ; the last joint of the 



c 2 



