Genera of the Cossonida. 567 
than even the last genus does, for the inner o.nguliform 
projection which is so conspicuous a feature in Gloeotrogus), 
added to its abbreviated funicuhis, its greatly enlarged 
capitulum, its elongate, oval, much exserted head, and the 
fact of its large but depressed eyes being considerably 
approximated on the underside, affiliating it unmistakeably 
with the small assemblage of types which appear to be 
characteristic of the islands of the Malayan archipelago. 
As comjjared with Homalotrogus, the present genus is 
remarkable for the body being both larger and very much 
more deeply and coarsely sculptured ; for its rostrum being 
more parallel {i. e. much less contracted behind, and there- 
fore less expanded in front) ; for its head being a little 
thicker (or less narrowed) ; for its antenna (which are 
more strictly medial as regards their insertion, instead of 
ante-medial) having their scape rather more evidently 
sinuated internally, and their second funiculus-joint not in 
the slightest degree lengthened ; and for its prothorax 
being longer, or more oblong, and more decidedly tri- 
sinuated along its basal edge. The two species from which 
my generic diagnosis has been compiled were collected by 
Mr. Wallace in the island of Batchian. 
83. Heterophasis. {nov. gen.). — The very beautiful 
insect, so remarkable for its rufescent prothorax, and the 
other, totally dark one, on Avhich the present genus is 
established, are from the collection of Mr. Pascoe, and 
were captured by Mr. Wallace at Dorey in New Guinea. 
In the more ordinary construction of their rostrum and 
antennae they make a still nearer approach to Cossonus 
than the members of any of the three preceding grouj)s. 
Nevertheless I think they may faii-ly be separated from 
the true Cossoni, — from which they may be said to differ 
not only in their surface being at times more elegantly 
coloured (a fact of great significance in this department of 
the liliyncopliord), but likewise (which is equally im- 
portant) in their more fusiform, or less parallel, outline, 
their extremely depressed surface (in which respect they 
agree with the three preceding genera), their rather more 
prominent eyes, and in their prothorax (which is alike 
free from a keel and a depression) being almost totally 
unsculptured — with the exception of being impressed down 
either side of its central region (and in the anterior con- 
striction) with a row of punctures — which in H. rnjicollis 
are extremely large, but almost obsolete in the concolor. 
