360 DESMONTCINiE. 



altliougb long and sharp, being ])robab]7, feeble and of no use as 

 biting organs, wbile the maxillae have completely lost all biting 

 parts and are reduced to mere supports lor tlie well-developed 

 sensory palpi. The legs are slender and on the whole most like 

 those of certain Dynastin^, and the claws are simple and 

 symmetrical, except that, as in some Dynastin^, the inner front 

 claw bears a broad lobe, peculiar no doubt to the male. 



This curious form seems on the whole to resemble a Chilian 

 genus, Oryctomorplius, more than any other known beetle. It 

 has certain points of resemblance, for example, in the method of 

 articulation of the front femur and tibia, to the Pabastasiini, 

 but the occurrence of four external teeth upon the tibia is 

 unknown in any Ruteline, while the simple symmetrical claws of 

 the four posterior feet connect it rather with tlie Dynastin^, to 

 M hich it is undoubtedly related. The lobed front claws of the 

 male and the produced mandibles are shared with the two other 

 subfamilies, but the shape of the clypeus and the conformation 

 of the organs of the mouth are quite foreign to both these groups. 



Although agreeing with Peltonotus in having the labrum ex- 

 truded, the form of that organ is entirely different, and the 

 correspondence probably implies nothing more than the retention 

 by both of a primitive feature. In nearly every other respect 

 the two genera are widely different. 



Genus DESMONYX. 

 Desmonyx, Arrow, Ann. Mag. Nat. Hist. (7) xix, 1907, p. 355. 

 Type, Desmonyx Jiumeralis, Ari*ow. 



Range. Burma. 



Body compact and hairy, with ratlier slender legs. Eyes not 

 large, but very prominent. Clypeus very narrow at the base, 

 dilating a little in front of the antennas, trilobed in front, with 

 the lobes curved upwards, the middle one sharp and the lateral 

 ones rounded. Antennae 10-jointed, the first joint clubbed, the 

 2nd globulai-, the 3rd to the 6th elongate, the 7th short, and the 

 last three forming a club longer (in the male) than the footstalk. 

 The labrum is extruded, forming a narrow finger-like process 

 clothed with long hairs. The mandibles are long and narrow, 

 tapering to a sharp point and strongly curved at the ends, which 

 extend beyond the clypeus. The njaxillae are atrophied, without 

 lobes or teeth, but with rather long 4-jointed palpi, the last joint 

 large and fusiform. The labium is a simple rounded lobe, with 

 the 3-jointed palpi placed near the extremity, their terminal joint 

 large and fusiform. The pronotum is transverse, with the sides 

 and base rounded, and the angles not sharp. The scutellum is 

 large and nearly semicircular. The front coxae are prominent and 

 contiguous, the middle coxte separated and the mesosternuni 

 elevated between them but not produced. The front tibia is 

 armed with four external teeth at unequal distances, the upper- 



