I.ungicorn Coleoptera. 203 



tlie male mandibles showing but little or even no difference 

 from those of the female, so that at first it seems difficult 

 to distinguish the sexes; this may, however, be easily 

 done by examining the apical ventral segment. This is 

 quite short in the male, and its hind margin is very gently 

 and evenly rounded, and its surface is covered rather 

 sparingly with obsolete, transverse, granular punctures. 

 In the female the length of this segment is considerably 

 greater, and its hind margin is obscurely truncate in the 

 middle ; the punctures are less obsolete, and the abundant 

 cilicB of the hind margin are twice as long as in the male. 

 Of this latter sex I have two individuals before me, one 

 small the other large : the smaller of these individuals 

 shows in its mandibles no greater development than does 

 the female ; W'hile in the larger specimen their apical 

 portion is somewhat elongate and curved, showing thus 

 the first stage of the development which is so remarkable 

 in many species. 



Sent from Oahu as No. 88. 



Ceresium, Munich Cat. 

 Stenocorus simplex, Gyll. 



I have seen four individuals of this species, only one of 

 which is a male. This individual is only half the size of 

 the females, and is remarkable by the middle tibiae having 

 a large prolongation inw-ardly at the extremity. In the 

 female there is a slight scooping out of the inner side of 

 the tibia near its extremity. The male has also the apical 

 ventral segment shorter than the female, and its hind 

 margin forming a gentle continuous curve, while in the 

 female the more projecting middle part of the hind margin 

 is subtnmcate. In the male individual there is also a 

 large exserted supplementary apical segment. The an- 

 tennte of this specimen are scarcely so long in proportion 

 to the body as they are in the females ; and there are also 

 some slight differences of colour and sculpture. I think 

 it probable, however, that these are really the sexes of one 

 species, but I hope Mr. Blackburn may decisively settle 

 the point. It is worthy of remark that Fairmaire con- 

 sidered the specimens found in Tahiti to represent three 

 species, but as he did not distinguish the sexes, I am 

 unable, at present, to form any opinion as to Avhether the 

 union of his three species into a single one, as has been 

 done by the more recent authors, is correct. This species 



