Lucanoid Ooleoptera. 89 



Lept'inopterus Fryi, Parry. 



A second specimen of this rare insect, hitherto unique 

 in my own collection, exists in the Berlin Museum ; it 

 differs as to the size of the mandibles, these being consi- 

 derably shorter, and consequently denoting a var. minor. 

 The female appears still to remain unknown. 



Fam. DoECiDj;. 



It appears to me advisable, with a view of facilitating 

 the general arrangement of the insects belonging to this 

 family, to separate them into two distinct divisions ; and 

 to include in the first division the genera containing 

 species of a large or moderate size, in which, in their 

 normal condition, the mandibles attain a maximum deve- 

 lopment, and are porrect, and often considerably exceed 

 the length of the head; moreover, the several species 

 exhibit a certain marked uniformity both of form and 

 colour. Their habitat, too, with four exceptions {Dorcus 

 •parallelus, D. parallelipipedus , D. Musimon, and D. 

 Peyronis) , is confined to the Continent of India, China, 

 and to the Islands of the Indian Archipelago. 



In the second division, 1 locate the genera composed of 

 insects usually presenting a very minor development of 

 mandibles; these are often recurved, seldom exceed 

 the length of the head, and exhibit a greater diversity 

 of form, sculpture, and colour; their habitat, moreover, 

 is exclusively confined to Europe, Africa, the American 

 Continent, and Australia. 



Eurytrachelus Bubahis, Perty. 



In my former Catalogue, this was recorded as a distinct 

 species, a suggestion being made that it would, per- 

 haps, ultimately prove to be a var. min. of either 

 E. Titan or E. Bucephalus ; having since obtained speci- 

 mens showing the various gradations of form exhibited 

 in E. Bucephalus, one of which, a var. minor, corresponds 

 exactly with Perty's description of Buhalus, I no longer 

 entertain any doubt as to their specific identity. It has 

 I believe, been suggested by some entomologists, that 

 E. Bucephalus (of which an excellent figure is given by 

 Perty) and E. Titan are identical; in this view I cannot 

 participate, seeing the very marked differences exhibited 

 by these insects in the clypeus, and in the form of the 



