24 Mr. C. J. Gahan on neio 



From S. damicornis, Linn., this species may be readily 

 distinguislied by the almost entire absence of punctuation 

 from the elytra, as well as by the stronger and rugose punc- 

 tuation of the underside of the head. In size, general form, 

 and in the structure of the mandibles it agrees closely with 

 S. damicornis. 



The species was described by Chevrolat (Ann. Soc. Ent. 

 de France, 1862, p. 273) under the name 8. damicornis^ 

 Linn. — a very excusable error considering that the descrip- 

 tions and figures of the latter species given by the older 

 authors are equally applicable to the present species. 



I am satisfied that the 8. damicornis of Linnaeus is cor- 

 rectly determined in the British Museum collection, as all the 

 specimens are from Jamaica — the locality ascribed to it by 

 Linnaeus and Drury — and agree with a specimen so named 

 in the Banksian collection. In all these specimens the elytra 

 are scarcely glossy and are very finely and rather closely 

 punctulate. The underside of the head is strongly enough, 

 but not rugosely, punctured. In the fully-developed males 

 the dorsal ridge of the mandible disappears gradually in front; 

 in the males of 8. Chevrolati this disappearance of the dorsal 

 ridge is more abrupt. 



From 8. exsertus^ Oliv,, the males of 8. Chevrolati may be 

 distinguished by the strong inner tooth on each of the man- 

 dibles near its apex, and by the somewhat coarser punctuation 

 of the underside of the head. I am unable to give characters 

 which shall sufficiently distinguish the females of these two 

 species. Locality and the character of the punctuation of 

 the underside of the head may perhaps serve as helps. The 

 specimens of 8. Chevrolati in the British Museum collection 

 are from Cuba^ with the exception of one (a female) from the 

 Bahamas ; those of 8. exs&rtus are from St. Domingo. 



It is highly probable that the 8. capra of Dejean and the 

 8. loevigatus of Beauvois, both from St. Domingo, are forms 

 of minor development of >S'. exsertus. The only differences I 

 can detect relate to size and to the form of the mandibles^ the 

 latter in 8. capra and 8. loivigatus approaching more to the 

 female form. 



Mallodon hituherculatum^ Beauv. 



Judging from the figure and description of this species it 

 seems to me that it is the female of Mallodon maxillosum, 

 Drury. 



