﻿18 Major Parry's Catalogue 



tarsi are here much shorter. The female has much the appearance 

 of Odontolabis glabratus, De Haan, but the sides of the prothorax 

 are regularly rounded. From Macrognathus, Burm., as well as from 

 Platijprosopus, Hope, Helerochlhes differs in having the middle tibiee 

 without a central spine, and in the form of the head and prothorax. 



This new form affords a proof of the advantage af!brded in the 

 classification of the Lucanidce by the number of the spines upon the 

 tibiae, especially of the middle and hind legs, as an examination of 

 this character at once leads us to the true affinities of the insect. 

 Instances may indeed occur in which the tibial spurs are liable to 

 be almost obsolete, but the finger will often detect them when the 

 eye cannot clearly perceive them ; besides which, of course, this 

 character, like every other, is liable to modification, and is not to 

 be depended upon with absolute certainty, but in a very large 

 majority of cases it truly indicates natural groups. 



1 am much indebted to Major Parry for affording me the oppor- 

 tunity of examining, describing and figuring this new Lucanoid 

 form, rendered as it is the more interesting by the possession of 

 both sexes, as well as of the minor development of the male sex. 



Heterochthes braciiypterus, Westw. (PI. X. fig. 6, ?, 

 fig. 7, S ; PI. XI. fig. 1, 2, 3.) 



Cladognalhus brack?jpterus, Parry, MS. 



H. niger, piceo vix tinctus ; disco supra laevi nitido et fere 

 impunctato, lateribus elytrorum punctatis exceptis ; femori- 

 bus tibiisque castaneis. 

 $ maj. Long, mandib. lin. 5| ; capitis, lin. Sg ; prothor. lin. 

 Sg ; elytr. lin. 5-^ = long. tot. lin. 1 7^. Latit. capitis, lin. 5| ; 

 prothor. lin. 5; elytr. lin. 5. 

 3 min. Long, mandib. lin. 1 ; capitis, lin. 2J ; prothor. lin. 2 ; 

 elytr. lin. 5 = long. tot. lin. 10^. Latit. prothor. lin. 4 ; 

 elytr. lin. 4|. 

 $ Long, mandib. lin. 1|; capitis, lin. 1^; prothor. lin. 2; 

 elytr. lin. 4 = long. tot. lin. 8^. Latit. capitis, lin. 2| ; 

 prothor. lin. 2 ; elytr. lin. 4. 

 Habitat in Cambodia. D. Mouhot. Mus. Parry et Saunders. 

 The male has the head much larger than the prothorax, flattened, 

 transverse-quadrate, the fore-margin nearly straight, the front 

 vertical, slightly concave, with the upper edge acute ; the centre 

 of the clypeus produced into a rounded tubercle ; the sides behind 

 the eyes (which are entirely divided by the canthus) very finely 

 and distantly punctured and slightly sinuated, but not produced 

 into a decided tubercle or spine. The mandibles in the larger 



