362 RHYNCHOPHORA. [Ceuthorrkynchidius . 



.should be light testaceous, and the elytra fuscous or liver-coloured, dull, 

 with scattered shining cinereous scales ; the striae of the elytra are 

 narrow and the interstices flat. L. lj-2 mm. 



On Brassica cheiranthus and other Cruciferse ; occasionally in moss ; rare ; Faver- 

 sham (Walker) ; Chatham (Walker and Champion) ; Eastry and VVingham, Kent 

 (Gorham) ; Littlington (Cambridge), Ditchingham (Norfolk), and Hurstpierpoint 

 (Power) ; Dorking (S. Stevens) ; Seaford (Waterhouse) ; near Repton (Garueys). 



C. pyrrhorhynchus, Marsh (erythrorhynchus, Gyll.; cochlearice, 

 Thorns, nee 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 tibiae 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 tibiae is more con- 

 spicuous ; the last joint of the tarsi also is darker. L. lf-2 mm. 



Male with the posterior tibiae armed with a large straight hook, the 

 last ventral segment impressed and the antennae inserted in the middle 

 of the rostrum ; in the female they are inserted a little behind the 

 middle. 



On Sisymbrium ojficinale ; locally common ; generally distributed in the London 

 district and the South-Eastern and Southern counties ; Swansea ; Bewdley ; llepton ; 

 Norfolk ; Manchester district, general ; Northumberland and Durham district, not 

 common ; Scotland, very rare, Solway district. 



C. pulvinatus, Gyll. This species is considered by Thomson 

 (Skand. Col. viii. 256), whose views, as Mr. Eye remarks, are usually 

 the reverse of synthetical, to be merely a variety of the preceding which 

 has the upper surface more thickly clothed with scales ; 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 tibiae are black. L. lf-2 mm. 



Very rare ; the food plant apparently is not known but it is probably one of the 

 Cruciferce ; Hastings, August, 1867 (Power, confiimed by Brisout) ; Evesham and 

 Hunstanton, Norfolk (Blatch). 



C. nigrinus, Marsh. (depressicoUis, 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 



