Genera of the Cossonidcs. 583 
veloped protliorax and elongate feet, as also in the fact 
of its first and second abdominal segments being divided 
from each other by a conspicnous line, that I think it will 
be more natural to place it in the present position than else- 
where. Its coxfe are all of them very widely separated, 
though each successive pair is more remote than the one 
which precedes it ; its eyes are exceedingly large and 
prominent; and its prothorax is slightly concave on the 
underside. The single species on which the genus is 
established is from the Malayan archipelago, — it having 
been captured by Mr. Wallace in the island of Batchian, 
as well as at Dorey in New Guinea. 
109. Pachystylus {nov. gen.). — Two examples of the 
remarkable species for which the present genus is estab- 
lished have been communicated by Mr. Fry as having been 
received fr-om Chili ; and their position in a natural system 
of arrangement is not altogether very apparent, — though, 
on the whole, I believe that it will be best to place them at 
no great distance fr'om Rhyncolus. Nevertheless I must 
admit that in the minuteness of their scutellum they stand 
perfectly alone amongst those immediate groups, and make 
a far nearer approach to Pliloeophagus and Caulotrupis. 
Still, the scutellum is not quite obsolete ; and the other 
details of their structure (particularly as regards their in- 
crassated limbs, and their short first tarsal and second 
funiculus joints) are so much more in accordance with the 
corresponding ones of the Rhyncoli that I cannot persuade 
myself to remove the genus into the Pldoeopliagus neigh- 
bourhood ; though, at the same time, I am far from think- 
ing that the situation which I have selected for it is quite 
satisfactory. Be the position, however, of Pachystylus 
what it may, it is, as a genus, very distinct from every- 
thing else with which lam acquainted, — the smallness of its 
scutellum and its extremely prominent eyes (which in the 
male sex are abruptly terminated posteriorly, but gradually 
sloped-ofF in front), in conjunction with its somewhat 
lengthened rostrum (as compared Avith that of the Rhyn- 
coli), which is very much broader in the males than in 
the females, and its elongate, thickened scape (which, on 
account of its robustness throughout, is but little clavated 
towards the apex), giving it a character which is essen- 
tially its own. Although not wider than the eljtra, its 
prothorax (which is almost free fr'om an anterior constric- 
tion) is very largely developed, and elongate; and there 
