210 [September, 



5 (2). — Pygidium of female strongly grooved. Last ventral segment in male 



bearing on either side near the hind margin a large ridge-like tooth, 

 which reaches about half the length of the segment ; the space 

 between the apices of these teeth excavated in a continuous curve, 

 and not bounded on the hind margin by a ridge. Last ventral segment 

 in female with a deep narrow groove reaching from the middle of the 

 hind margin about half way across the segment punctiger, Gyll. 



6 (1). — Hair-scales on the elytra albo-cinereous, the white scutellary patch 



therefore inconspicuous. Last ventral segment in male with a large 

 crescent-shaped depression, each horn of the crescent ending on the 

 hind margin in a blunt elevation or tooth. Pygidium scarcely per- 

 ceptibly notched in either sex molleri, Thoms. 



[rotundatus, Bi'is.). 



C. manjmatus, Payk. — This may be distiuguislied from all its 

 allies, except simUlimus, by the deep irregularly confluent puncturation 

 of the thorax, and a certain square and flat appearance of the front 

 half of the elytra ; the interstices of the la,W:-er are wide and flat, the 

 striae relatively narrow, and the sides and apex more evidently tuber- 

 culated than in the allied species. C. marginatus exhibits two well- 

 marked structural aberrations ; in one, the Ceuthorrhynchidius distinc- 

 tus of Brisout, the funiculus is six-jointed, and on comparison of the 

 antennse with those of normal marginatum, it is evident that this 

 condition arises from the absence of the suture which would convert 

 the long third joint of the funiculus of dlstiiidm into the joints three 

 and four proper to margmafns. Of this aberration I have examined 

 eight specimens in coll. Champion from the localities following : Deal, 

 1 (;^, 3 $ (1 (J, 2 $ on the same occasion), Chatham, 1 ^, Arundel, 

 1 (^ , Weybridge, 1 ? , and Eeigate, 1 ^ ; at Deal, Chatham, and 

 Arundel marginatus pi-oper occurred on the same occasion, and I have 

 myself , taken ab. distindus at Colesborne, where veritable marginattis 

 also occurs. Of the aberration which is distinguished by having the 

 funiculus of one antenna six- jointed and the other seven- jointed, and 

 which might conveniently be called ab. inRMfuaUs, I have seen but one 

 specimen ; this is a male in coll. Champion, and was taken at Deal in 

 1873 by Commander Walker, who captured ab. distindus on the same 

 occasion ; another is recorded by Eye in Ent. Mo. Mag., vi, p. 229. 

 The view here adopted with regard to the relation of ab. distindifs and 

 ab. inxqnalis to C. marginatus is confirmed by the fact that all Mr. 

 Champion's specimens, as well as my OAvn, exhibit in both sexes the 

 secondary sexual characters proper to tnarginatus. 



G. similUmus, nom. nov. (mu7Zeri, Schultze). — This species is de- 

 scribed in considerable detail by A. Schultze (Deutsche Ent. Zeitschr., 



