of Lucanoid Coleoptera. - 13 
Opontorasis Vottennovi g@, Parry (var. max., @ ignota). 
(Pl. VIII. fig. 1.) 
Lacordairei, Id., MS. olim. 
O. atro-fuscus; elytris levissimis, flavis, anguste nigro-marginatis, 
sutura latius nigra; capite magno, lateribus supra densissime 
rugosis, margine antice reflexo emarginato, plagd magna rufa 
notato, mandibulis capite fere duplo longioribus, rugoso- 
punctatis, apicibus furcatis interne denticulatis, et dente forti 
ante medium instructis; tibiis anticis in medio obsolete uni- 
dentatis, posticis quatuor inermibus,. 
Long. corp. (mandib. incl.) une. 2, lin. 9. 
Hab. Borneo. Specimen unicum in Coll. Parry. 
I had originally named the above species after my distinguished 
friend Professor Lacordaire, whose reputation as an Entomologist 
is so universal that I need scarcely allude to it. M. Snellen van 
Vollenhoven, having received from Sumatra a closely-allied species, 
and being under the impression that it was identical with the above, 
courteously retained my MS. name in his description of the 
Sumatran species (vid. Tijd. v. Ent. iv. 104, tab. v. fig. 1.) 
The two are, however, totally distinct, and I have great pleasure 
in dedicating this fine species to a gentleman who has rendered 
such important services to science as Director of the museum of 
Leyden, and to whom J feel grateful for his kind attention when 
recently there. 
O. Vollenhovit has the facies of the preceding genus Hexar- 
thrius, forming the connecting link between the two genera. It 
differs from O. Lacordairei in the following particulars—the 
mandibles are more robust, more convex, and more strongly 
punctuated ; the head is in proportion larger, with the anterior 
elevated margin slightly sinuated in the centre, and the angle 
behind the eye is more obtuse; but the principal difference is to 
be found in the prothorax, which is considerably narrower, with 
the sides rectangular instead of being dilated, and the posterior 
angles strongly emarginate; the body is also somewhat shorter. 
Opontorasis Lupexinen, Voll. (PI. Il. fig. 1.) 
Lucanus Ludekingii, Voll. Tijd. v. Ent. iv. 104, tab. v. fi 2. 
O. ater; capite latissimo, in lateribus punctatissimo, fronte 
transversim carinata; elytris leevissimis testaceis, sutura latius 
et limbo externo anguste nigris. 
Long. corp. (mandib. incl.) 23 une. 
Hab. Sumatra. Coll. Mus. Lugdun., de Castelnau, Mniszech 
et Parry, 
