518 Mr. T. Vernon Wollaston on the 



prominent eyes ; by its antennae, which have their second 

 funiculus-joint conspicuously longer than those which 

 follow it, being inserted about the middle of the rostrum ; 

 and by its exceedingly elongate and greatly developed 

 legs, the femora of which are much incrassated, or 

 clavate, and are rather roughened with a few minute 

 and indistinct asperities, or tubercles, on their inner sur- 

 face; whilst the tibiae are sinuated internally, and pro- 

 duced into a small but evident spinule at their inner angle, 

 and the tarsi (especially their terminal articulation) are 

 elongate. 



Cossonideus may very possibly be the representative of 

 an important Pentarthrideous form in Australia ; but in 

 external facies it nevertheless recedes greatly from the 

 Pentarthrides as hitherto known ; though at the same 

 time it must be admitted that the (comparatively diminu- 

 tive) Microcossonus Wallacei, from New Guinea, makes 

 likewise a decided approach (though certainly a less strik- 

 ing one) towards the Cossonus and Mesites type. 



18. TYCHIODES (Wollaston, Trans. EnL Soc. Lond. 

 16. 1873). This is altogether one of the most curious of 

 the Cossonideous forms with which I am acquainted, its 

 rather wide, subdepressed, oblong-elliptic body (which, as 

 in most of the allied groups, is slightly shining, castaneo- 

 piceous, and free from pubescence), in conjunction with 

 its extremely slender and cylindrical rostrum (I believe in 

 both sexes), its short, transverse prothorax, and thickened 

 legs, giving it more the appearance at first sight of some 

 member of the Erirhinides, in the vicinity of Tychius, 

 than of a Cossonid. Its antennae (which are rather 

 slender, and implanted considerably behind the middle of 

 the rostrum) have their scape short and a good deal 

 flexuose (and, as it were, obscurely scooped-ouk on the 

 underside), and likewise the second articulation of their 

 lax, 5-jointed funiculus considerably longer than those 

 which follow it. Its scutellum is very conspicuous, and 

 its feet (which are rather thick, and largely developed) 

 have their third articulation deeply bilobed. Its meta- 

 sternum is a little less elongated than is the case in Pen- 

 tarthrum, Stenotrupis, Lyprodes, Leptomimus, and others. 

 It was detected by Dr. A. Adams in the Japanese archi- 

 pelago, namely on the island of A wasima, off the north- 

 west coast of Nipon. 



