Genera of the Cossonidce. 581 



and appear to be extensively spread over the Malayan 

 archipelago whence two species of each, now before 

 me (which have been communicated by Mr. Pascoe), 

 were obtained by Mr. Wallace in the islands of Ceram, 

 Morty, Batchian, and Ternate. They belong to a type 

 quite distinct from any of the preceding ones, their very 

 lightly sculptured, shining, deep-back, cylindrical bodies, 

 in conjunction with their short, broad, and thick rostra 

 (which are but very little narrower than the head), their 

 excurved scape, their abrupt, compressed club, and the 

 fact of their first and second abdominal segments being 

 divided by a very conspicuous line, giving them a cha- 

 racter which it is impossible to mistake. In Xestoderma 

 the rostrum is free from an anterior channel, the capitulum 

 is but moderately developed, the intermediate coxae are 

 very remotely separated, and the third tarsal joint is quite 

 pimple. The scutellum is either small and somewhat 

 rounded, or else smaller still, short and transverse. 



105. XESTOSOMA (nov. gen.). As already implied, the 

 members of this genus have much the appearance of those 

 of the preceding one ; nevertheless the body is relatively 

 a little broader and thicker ; and moreover, whilst one of 

 the species is highly polished, the other is almost opake. 

 The antennas too have their scape longer and somewhat 

 more robust, and their club dark and sericeous, and con- 

 siderably more developed, it being very large and rounded 

 in the X. grandicollis, but oval in the subopacus. The 

 scutellum is very minute, short, and transverse (rather 

 more so perhaps than in even the Xestoderma atrd] ; the 

 intermediate coxae are rather less widely separated; and 

 the third tarsal joint is not quite simple, it being appre- 

 ciably (at any rate in the anterior pair), though very mi- 

 nutely, sub-bilobed, or cordate. 



106. LISSOPSIS {nov. gen.). Unfortunately the only 

 example which is accessible to me in drawing out the 

 characters of the present genus has lost its antennae ; yet 

 its other details are so well defined, and I am so convinced 

 that the insect cannot be referred to any other group enun- 

 ciated in this paper, that I have no hesitation in treating 

 it as a distinct type of the sub-Hylastideous Cossonids with 

 exceedingly abbreviated rostra. It is at once remarkable 

 for its rather wide, short, and parallel-oblong outline (which 

 is somewhat obtuse both before and behind) ; for its ros- 



