•911.] 209 



but of the cliiiracters therein relied upuii fur their separation some are 

 certainly illusory and others are subject to great variation, so that one 

 frequently meets with specimens which cannot be certainly determined 

 without reference to the secondary sexiial characters ; indeed, it may 

 be said that G. aimillimus, (nom. nov. for C. w/iUeri, Schultze) can 

 only be distinguished from C. maryinahis, Paylc, by the difference in 

 the last ventral segment of the niale. These secondary sexual charac- 

 tei's are worthy of consideration in detail. In the males the last 

 ventral segment has next the hind margin a depression occupying 

 about one-third of the width, and one-half of the length of the seg- 

 ment ; this depression is bounded on each side by an elevation which 

 is either as long as the depression {puncUger) , evident only near the 

 middle of the segment (marguiatus), or most evident at the hind 

 margin (mulleri, simiUimus) ; the pygidium is deeply grooved in 

 puuctiger, and feebly notched in the other species. In the females the 

 last ventral segment has a deep narrow groove reaching from the 

 middle of the hind margin aboiit half way across the segment {imnc- 

 tiger), a feeble oval depression in a similar situation (marginatus), or 

 is simple (miiJleri, simiUimus) ; the pygidium is deeply grooved {imnc- 

 tiger), very indistinctly notched (iniJUeri), or entire {marginatus, simil- 

 limvs). C. marginatus, G. ])unctiger, and G. m'uJleri (rotundat^is) are 

 dealt with by Cox (Handbook Col. ii, p. 135) and Fowler (Col. Brit. 

 Isl., V, pp. 344, 345), but in neither case in a manner which would 

 indicate first-hand knowledge of the insects, and the latter author was 

 mistaken in supposing that violleri (rotiindatus) was entirely omitted 

 by Bedel ; on the contrary , M. Bedel characterizes the species in Col. 

 Bass. Seine, VI, p. 169, and on p. 427 refers to its capture at Yport by 

 St. Claire Deville. 



Eeviewing the material before me, I would separate the species 

 as follows : — 



1 (6). — Hau--scales on the elytra ochreoiis, the white sctitellar patch therefore 



very conspicuous. 



2 (5). — Pygidiiira of female not strongly groovod. 



3 (4). — Last ventral segment in male with a broad depression near the middle, 



bounded on the hind margin by a ridge ; on either side of this depres- 

 sion a triangular naked forwardly directed tooth, which is quite free 

 from the hind margin of the segment marginatus, Payk. 



4 (3). — 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 [simiUimus, nom. nov. 



{molleri, Schultze).] 



