Genera of the Cossonida. 519 



19. TYCHIOSOMA (nov. gen.}. The insect for which I 

 have founded the present genus is from the Philippine 

 Islands, and has been communicated by Mr. Pascoe. It 

 is very closely allied to the Japanese Tychiodes Adamsii, 

 from which, however, it differs in being not only larger 

 and more depressed and with the limbs longer, but like- 

 wise in having its antennas more medially inserted, with 

 the scape especially more lengthened, less arcuate, and 

 without any tendency to be hollowed-out internally, and 

 with the funiculus gradually much more widened, and 

 consequently with the club (which is itself longer) less 

 abrupt. In addition to which, its prothorax (which is 

 equally small) is more triangular, or less transverse, as 

 well as (together with the under-segments) extremely 

 shining and almost un sculptured ; its prosternum is 

 clothed, between the anterior coxas, with fulvescent pile ; 

 and its front tibia? (instead of being simple) are slightly 

 scooped-out towards their inner apex, the emargination 

 being barbed posteriorly with strong fulvescent hairs. 



20. LEPTOMIMUS (nov. gen.\ The two species now 

 before me for which the present genus is established, and 

 which have been communicated by Mr. Pascoe as having 

 been obtained by Mr. Wallace in the island of Gilolo, of 

 the Malayan archipelago, combine many very curious 

 features which are essentially their own. In their bodies 

 being exceedingly narrow and parallel they agree with 

 Stenotrupis ; but they nevertheless entirely want the 

 elongate, thickened, exserted head, and the completely 

 depressed eyes, of that genus ; their rostrum too is very 

 much more lengthened and slender (not being subdilated 

 anteriorly) ; their prothorax and antennas, as well as their 

 second funiculus-joint, are much more elongated ; the 

 third articulation of their feet is more expanded and 

 bilobed ; and their legs (instead of being equidistant from 

 each other at the base) have the intermediate coxaa rather 

 widely separated, but the front and hinder pairs appreciably 

 (and equally) more approximate. This last-mentioned 

 peculiarity is rather anomalous amongst the Cossonidce, 

 and particularly so amongst the Pentarthrides. In other 

 respects Leptomimus is remarkable for the opake, reddish- 

 brown, and most closely sculptured surface of its two 

 hitherto-discovered exponents, one of which, moreover, 

 is clothed with a short, setiform pubescence, whilst the 

 other appears to be bald. In all probability the group 



