Genera of the Cossonidce. 561 



allied forms) armed with a powerful and compressed spine 

 at their inner angle, and the feet short and thick, with 

 their third articulation expanded and deeply bilobed. 

 Their prothorax, too, (as in the Madeiran Stenotis} ap- 

 pears to be more or less concave beneath ; and their 

 antennas are implanted either about or a trifle before the 

 middle of the rostrum. 



73. GLCEOXENUS (nov. gen.). It is for an insect from 

 Madagascar (which has been communicated by John 

 Gray, Esq.) that I have proposed the present genus ; and 

 its primd facie aspect and fusiform outline are somewhat 

 those of a gigantic, deep-black, highly-polished, and lightly- 

 sculptured Rhyncolus. When more closely examined how- 

 ever it will be seen to belong, in reality, to a totally dif- 

 ferent group, the robust and peculiarly-shaped spine at 

 the inner angle of its four posterior tibise, in conjunction 

 with its much abbreviated and thickened feet (the terminal 

 joint of which is extremely short and conical) affiliating it, 

 most unmistakeably, with the types around Glceodema, 

 Phacegaster, Exonotus, and Pseudocossonus. Its rostrum 

 is rather broad, depressed, and nearly parallel (though 

 whether this is equally the case in both sexes I have no 

 means of judging) ; its limbs are incrassated and exceed- 

 ingly robust ; the third articulation of its feet, although 

 greatly thickened, is simple ; and the spine at the inner 

 apex of its front tibias is marvellously lengthened and de- 

 veloped, in which latter respect it differs from every other 

 Cossonideous form with which I am acquainted. As in 

 most of these immediate genera, its club is narrow and 

 somewhat acuminated ; but its antennas are inserted a 

 little more evidently before the middle than is usual in the 

 majority of its allies. 



74. EXONOTUS (nov. gen.},, A genus the type of which 

 (captured by Mr. Wallace in the islands of the Malayan 

 archipelago) is well distinguished by its elongate, narrow, 

 and parallel outline, rather large size, and convex, shining 

 surface, which is of a deep black, with the anterior por- 

 tion of the elytra red. Its head and rostrum are broad, 

 and of nearly equal width, the latter (which seems to be 

 linear in the females, but rather expanded anteriorly in 

 the males) being somewhat short; its coxae are all of 

 them about equally separated; its legs are exceedingly 

 thick and robust ; its tibiaa (the front pair of which are 



