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 
Platyprosopus, Hope, Heterochthes differs in having the middle tibize 
without a central spine, and in the form of the head and prothorax. 
This new form affords a proof of the advantage afforded in the 
classification of the Lucanide by the number of the spines upon the 
tibiz, 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. 
I 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. 
HertTrrocuTuEs BRAcHYpTERUS, Westw. (Pl. X. fig. 6, 9, 
figeas 06 87 el eho sly 2.93.) 
Cladognathus brachypterus, Parry, MS. 
H. niger, piceo vix tinctus; disco supra levi nitido et fere 
impunctato, lateribus elytrorum punctatis exceptis ; femori- 
bus tibiisque castaneis. 
é maj. Long. mandib. lin. 533 capitis, lin. 3}; prothor. lin. 
23; elytr. lin. 58 = long. tot.lin, 174. Latit. capitis, lin. 53; 
prothor. lin. 5; elytr. lin, 5. 
é min. Long. mandib. lin. 1; capitis, lin. 23 ; prothor. lin. 2; 
elytr. lin. 5 = long. tot, lin, 103. Latit. prothor. lin, 4; 
elytr. lin. 43. 
Long. mandib. lin. 133; capitis, lin. 143 prothor. lin. 2; 
elytr. lin. 4 = long. tot. lin. 83. Latit. capitis, lin. 22; 
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 
