518 Mr. T. Vernon Wollaston on the 
prominent eyes ; by its antennae, ■wlilcli have tlieir 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 aspeiities, or tubercles, on their inner sm-- 
face ; whilst the tibia3 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 
Fentarthrides as hitherto known ; though at the same 
time it must be admitted that the (comparatively diminu- 
tive) Mlcrocossonus JVallacei, from New Guinea, makes 
likewise a decided approach (though certainly a less strik- 
ing one) towards the Cossonus and Mcsites type. 
18. Tychiodes (Wollaston, Trans. Ent. 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-elHptic body (which, as 
in most of the allied groups, is slightly shining, castaneo- 
piceous, and free from pubescence), in conjunction Avith 
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 Tyckius, 
than of a Cossonid. Its antennie (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-ont 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 ratlier thick, and largely developed) 
have their third articulation deeply bilobed. Its m eta- 
sternum is a little less elongated than is the case in Fe7i- 
tnrthrum, Stcnotrupis, Lijprodes, Leptomimus, and others. 
It was detected by Dr. A. Adams in the Japanese archi- 
lielago, — namely on the island of Awasima, off the north- 
west coast of Nipon. 
