PENICHROLUCANUS. 233 



■axe still more coarsely and deejjly wiiiikled than those of 

 C atavus, and the depression in front extends rather farther 

 back than in that species 



I have seen only a single example from Burma and the 

 origmal type from Yunnan. The type specimen is a small 

 example, and many of the features regarded as distinctive of 

 tlie species by Xagel are hidividual only. 



Subfamily Penichrolucaxin^. 



This subfamily is constituted for the very curious genus 

 Penichrolucanus, which contains only five knoAvn species. It is 

 sufficiently characterized by the form of the tarsi, the joints of 

 which are comj)letel3^ and solidly united, those of the four 

 ])osterior legs having lost all trace of their original articulations. 

 The claws are re<luced to rudiments. 



These insects are extremely rare. Onl}^ a smgle specimen 

 has yet been found witliin the Indian region, and four of the 

 five kno\Mi species are at present represented only by single 

 specimens. Of the fifth, found in Guadalcanal, Solomon Is., 

 by Capt. R. J. A. Lever, three were taken from rotten wood. 



Deyrolle's original description and figure are not entirely 

 accurate, especially as to the form of the antenna. 



Genus PENICHROLUCANUS. 



Penichrolucanus Deyr., Ann. Sue VlnX. France, 1S6.3, p. 485 ; 

 Parry, Trans. P]nt. Soc. Lond. 1S64, p. 64 ; Arrow, Trans. K. 

 Ent.'Soc. Lond. Ixxxiii, 1935, p. 122 ; Ann. Mag. Xat. Hi.st. (11) 

 2, 1938, p. 62. 



Type, P. copricephalus Deyr. (Malay Peiunsula). 



Bange. Xicobar Is., Malay Peninsula, Sumatra, Solomon Is. 



Very small, oblong, compact and rather depressed. Legs 

 short, with the femora and tibiae broad and Hat, and the tarsi 

 solid, very sliort and thick, tlie front tarsi witli five visible l)ut 

 completely fused joints, tlie middle and hind tarsi without 

 visible sutures. Claws mmute, partly or entii-el}' concealed 

 between the termmal plates of the tarsus. Head short, broad 

 and flat, the eyes well developed, completely divided and far 

 from the lateral margins, whicli are angularly produced behind. 

 Antennae very short, the scape long, the 2nd joint short, the 

 club 3-jointed, very short and compact, the foot-stalk extremely 

 short, triangular and solid, composed of three to five immovably 

 united joints. Head emarginate in front, the emargination 

 filled by the mandibles, which are very short, acute, bifid and 

 interlocking, not projecting beyond the general line of the head 

 in the position of rest. Mentum broadly transverse, convex 

 beneath, emargmate in front, with the lateral angles rather 

 sharp. Maxillary and labial palpi moderately long and slender. 



