362 RHYNCHOPHORA. [ Ceuthorrhynchidius. 
should be light testaceous, and the elytra fuscous or liver-coloured, dull, 
with scattered shining cinereous scales; the strie of the elytra are 
narrow and the interstices flat. L. 1;-2 mm. - 
On Brassica cheiranthus and other Crucifers ; occasionally in moss ; rare; Faver- 
sham (Walker) ; Chatham (Walker and Champion) ; Eastry and Wingham, Kent 
(Gorham) ; Littlington (Cambridge), Ditchingham (Norfolk), and Hurstpierpoint 
(Power) ; Dorking (5. Stevens) ; Seaford (Waterhouse) ; near Repton (Garneys). 
Cc. pyrrhorhynchus, Marsh (erythrorhynchus, Gyll.; cochlearie, 
Thoms. nec Gyll.). Closely allied to C. floralis, but rather broader, 
on the average larger, and usually of a more fuscous colour; it may be 
known by having the rostrum red, black at base, and the anterior margin 
of the thorax and the tibia reddish; the red colour is lighter ‘in some 
specimens than in others; the thorax is shorter, feebly transverse, and 
more strongly and somewhat rugosely punctured, with the constriction 
before apex stronger and the sides behind the constriction more convex 
and rounded ; the scales on the interstices of the elytra are rather 
broader, and the external tuft at the apex of the tibiz is more con- 
spicuous ; the last joint of the tarsi also is darker. L. 1$-2 mm. 
Male with the posterior tibia armed with a large straight hook, the 
last ventral segment impressed and the antenne inserted in the middle 
of the rostrum; in the female they are inserted a little behind the 
middle. 
On Sisymbrium officinale ; locally common ; generally distributed in the London 
district and the South-Eastern and Southern counties ; Swansea; Bewdley ; Repton ; 
Norfolk; Manchester district, general; Northumberland and Durham district, not 
common ; Scotland, very rare, Solway district. 
Cc. pulvinatus, Gyll. This species is considered by Thomson 
(Skand. Col. viii. 256), whose views, as Mr. Rye remarks, are usually 
the reverse of synthetical, to be merely a variety of the preceding which 
has the upper surface more thickly clothed with seales ; M. Bedel, how- 
ever, separates it as a species on the ground that the thorax is more 
strongly transverse, the general form is broad oval instead of oblong 
oval, and the anterior margin of the thorax, the rostrum, and the greater 
part of the tibiew are black. L. 15-2 mm. 
Very rare; the food plant apparently is not known but it is probably one of the 
Crucifere ; Hastings, August, 1867 (Power, confirmed by Brisout); Evesham and 
Hunstanton, Norfolk (Blatch). 
C. nigrinus, Marsh. (depressicollis, Gyll.). This species may be 
distinguished from its close ally, C. floralis, by having the thorax less 
strongly constricted at apex and the base almost straight; the scales of 
the upper surface are more scanty and are very seldom thicker at the 
suture of elytra; this latter character will distinguish it from 
C. melanarius, which is on the average a smaller insect ; the descriptions 
of some of these allied species, however, as given by different authors, 
are very contradictory, and this small group is one of the most difficult 
