200 SERRICORNIA. [ Dinoderus, 
DINODERWS, Stephens. 
This genus contains about eight species, of which two are found in 
Europe ; three have been described from North America, and one from 
Teneriffe ; they are cylindr‘eal insects, but less convex than some of the 
other members of the family, from which they also differ in not having 
the thorax drawn forward over the head ; in one or two points the genus 
forms a connecting link with the Lyctide, and Thomson (Skand. Col. 
v. 201) includes it under that family. 
D. substriatus, Payk. Elongate, subcylindrical, pitchy black, 
slightly pubescent ; head broad, rugosely punctured, with a transverse 
impression between antenne; antenneze inserted in front close to the eyes, 
with the basal joint short, robust, the second subglobose, the five follow- 
ing minute, and the last three forming an elongate rufescent club, of which 
the two basal joints are slightly produced internally, and the terminal 
one is subglobose and compressed ; eyes very convex; thorax subquad- 
rate, very globose and thickly tuberculated in front, with the tubercles 
slightly acuminate and largest towards anterior margin; elytra often 
lighter than thorax, retuse behind, deeply and coarsely punctured, with 
the punctures irregularly and closely placed, but rarely disposed in 
striae; legs pitehy red, with tibie and tarsi paler; tibia compressed, 
toothed externally, tarsi short, simple. L. 3 mm. 
In decayed trees; very rare; Darenth Wood (where an example was taken on the 
wing by Mr. G. Lewis); New Forest (Stephens) ; Skellingthorpe, near Lincoln (Rev, 
H. Matthews). 
RHIZOPERTHA, Stephens. 
This genus is cosmopolitan, and of almost universal distribution; it 
contains about thirty species, of which two have occurred in Europe ; 
our single British species oceurs in foreign seeds, old flour, ship’s 
biseuits, &c., and is evidently an importation, although it has to a certain 
extent become naturalized ; it may be distinguished by the elongate 
last joint of the tarsi, and the strongly and broadly serrate club of the 
antenne, 
R. pusilla, F. Oblong, subcylindrical, brownish-red or reddish- 
brown, almost glabrous ; head rather large, with eyes moderately pro- 
minent, antenne reddish, with the two first joints large, and the last 
three forming a strong serrate club; thorax longer than broad, slightly 
narrowed in front, with all the angles rounded, convex, rugosely pune- 
tured, scabrous and tuberculate in front; elytra long, parallel-sided, 
with regular rows of coarse punctures, much depressed at apex; legs 
ferruginous, tarsi apparently 4-jointed, with the last joint slightly longer 
than the preceding taken together. L. 2 mm, 
In roots and seeds imported from abroad, old flour, biscuits, &c., also in wood of 
