I qn [September, 



Deville, to whom I sent specimens for corroboration, has been good 

 enough to compare these with Brisout's original types, and is quite 

 satisfied that they are correctly named. He tells me that the insect 

 occurs in France on Lepidium camprstre, Brown. 



The species comes in the group with the following essential 

 characters : — antennae with 7-jointed funiculus ; femora without teeth ; 

 claws slender, simple. It may be separated from the other British 

 species in the group by the following table : — 



A. — Suture of elytra without a band of closely placed whitish scales from base to 

 apex. 

 a. — Elytra without a spot of whitish scales on the scutelluin. 



b. — Elytra black, with distinct double rows of scale-like whitish pubescence 

 on the interstices ; size larger. Long., 2 — 3 mm.... 



C. assimilis, Payk. 



bb.~ Elytra more or less blue or violet, scantily clothed with hair-like 

 pubescence on the interstices ; size smaller. 

 c. — Elytra bright blue, greenish, or violet ; thorax usually brassy. 



Long., 1£ — If mm C. erysimi, F. 



cc. — Elytra dark blue, sometimes nearly black ; thorax not brassy. 



Long., 1 — lj mm C. contractus, Marsh. 



aa.— Elytra with a spot of closely placed white scales on the scutellum. 

 d. — Tegument of elytra black. Long., I5 — 2 mm. .. 



C. cochlearise, Gryll. 

 dd. — Tegument of elytra, at least in part, reddish. Long., 



1^ — 2jmra C. querceti, Gyll. 



AA. — Suture of elytra with a band of closely placed whitish scales from base to 



apex.* 



e. — Band of scales continued to apex of thorax ; base of an- 

 tennae and legs ferruginous. Long., 2 — 2£ mm. .. 



[C. suturalis, F.] 

 ee. — Band of scales not continued on thorax ; antennae and 

 legs entirely black. Long., I5 — 2 mm. .. 



C. par vulus, Bris. 



Ceuthorrltynclius parvulus bears a very strong superficial resem- 

 blance to small O. floralis, Payk., but may be readily separated by its 

 7-iointed funiculus, and by the different character of the scales on 

 the interstices of the elytra, which are broader ;md whiter, and there- 

 fore more conspicuous. The original description may be found in 

 " L'Abeille," Tome v, p. 441. C. querceti is not unlike the pale form 

 of G. terminatus, Hbst. ; it was added to our list comparatively re- 

 cently by Mr. Champion (Ent. Mo. Mag., xxxv, 142). Specimens of 



* The scales on the elytra are very liable to be abraded. Since constructing the above table 

 I have seen a number of denuded specimens, in which only a trace of the sutural band is visible ; 

 but these cannot well be mistaken for any other species in the group, if size and the remarkable 

 resemblance to C. floralis are taken into consideration. 



