1 34« I June, 



elytra are unusually delicate in suffricmi, then the punctuation 

 at the apex is so much effaced that there should be no confusion with 

 natator. 



The sedeagus of suffricmi (figs. 5) differs markedly from that of 

 natator : the chitinisation of the tip of the ventral surface of the 

 median lobe extends further forwards, and the sides of the median 

 orifice are raised, and these raised margins meet in the middle behind, 

 so that the median orifice is definitely limited and the whole apical 

 portion is strongly chitinised. 



5. Gr. elongatus Aube, Edw., Eegimbart. 

 G. distinctus Sharp, Ent. Mo. Mag., v, 1868, p. 57. 



Closely allied to G. natator, but different in shape, the insect being 

 much narrower, and the sides of the elytra less rounded. The species 

 is variable, but the variation is very different from that of natator, as 

 it chiefly involves the shape, and not the sculpture and colour. Some of 

 the specimens are so straight- sided and elongate that I formerly thought 

 they connected this species with bicolor. This doubt I now know to 

 have been unfounded. G. bicolor has the apex of the elytra more 

 completely rounded and a very different median lobe of the sedeagus. 

 As regards the change of name, I should remark that the confusiou as 

 to elongatus, Aube, and distinctus has been very great, and I adopt the 

 name elongatus on the authority of Eegimbart, who tells us that 

 distinctus always has a fine punctuation of the interstices of the elytra, 

 whereas in our British specimens there is no such punctuation (cf. 

 Ann. Soc. ent. France, lx, 1891, p. 676). Moreover I sent a specimen 

 of our " distinctus " to Eegimbart, who returned it to me as being 

 elongatus, Aube. 



I cannot discriminate two species among our elongatus, though the 

 narrow specimens are I presume " var. angustatus, Aube." 



I find no clear distinction given by Eegimbart, in his succession of 

 notices, of distinctus from elongatus beyond the minute punctuation of 

 the former I have mentioned above. But there exists in the Edwards 

 collection a male of elongatus having the elytra dull, and with an 

 effaced minute sculpture ; the serial punctuation of the elytra is 

 unusually fine, and the outer apical angle perhaps less rounded. I 

 consider this analagous with var. /5 of natator ; and the aadeagus is the 

 same as in ordinary elongatus. Still it is possible that Eegimbart' s 

 distinctus may be something of this sort. 



The sedeagus of this species (figs. 6) is very similar to that of 



