88 Major F. J. Sidney Parry on 



Metadorcus, n. g. 



Head broad, strongly tuberculate behind the eyes, an- 

 teriorly emarginate. 



Antenme short. 



Clypeiis broad, slightly emarginate. 



Maiulihles slightly longer than the head, robust, arcuate, 

 internally furrowed, with a strong sub-erect tooth near 

 the centre, apex bifurcate. 



Prothorax somewhat broader than the head, posterior 

 angles oblique and emarginate, sides slightly sinuate. 



Elytra narrower than the thorax, very short and 

 convex. 



Tihice, four anterior indistinctly denticulate, posterior 

 unarmed. 



Metadorcus rotundatus. 

 Leptinoptenis rotundatus, Parry, Cat. Luc. p. 43. 



This South American species somewhat resembles 

 Macrocrates Bucephalus, Burm,, and might be mistaken 

 for the var. minor of that species. The latter differs in 

 the mandibles being considerably longer, equally robust, 

 but straight instead of circumflexed, in the clypeus being 

 considerably more apparent, broad, and slightly emargi- 

 nate, with the lateral angles acute ; the head also is much 

 broader, with the anterior margin nearly straight, and 

 the autennte are much more elongate. 



The insects composing the genus Leptiuoptcrus, in 

 which genus M. rotiindatus was formerly located, differ 

 in having the mandibles less robust, more porrect, and 

 but slightly arcuate, the armature more variable, the 

 head unarmed behind the eyes, the elytra considerably 

 more elongate and depressed. 



The great difference in the form of the prothorax, and 

 in the character of the mandibles, the very slight arma- 

 ture of the tibia?, the posterior being totally unarmed, 

 separate it, I think, from those species of the Dorcidce 

 pertaining to the South American genus ScJcrostomus, to 

 which it somewhat assimilates, and I place it as the 

 link between Macrocrates and Leptinopterus. Judging 

 from the specimens with which I am aquaintcd, I am 

 under the impression that they are referable to the var. 

 max. 



