REVISION OF THE NYCTOZOILIDES. 139 
NOTES ON THE GENERA. 
Onosterrhus, Pasc. = Hypocilihe, Bates. 
I am able to endorse the sagacious forecast of Dr. Haag- 
Rutemberg (Journ. Mus. Godeffr. 1879, p. 119), who strongly 
suspected the connection between these genera, and who in 
describing Hypocilihe im punctata noted that one of the distinctive 
characters of Bates' si genus — the structure of the maxillary palpi — 
had already broken down. Mr. Blackburn makes a similar sugges- 
tion (These Proo. 1890, p. 56-1), though he seems not to have 
identified any described species of Onosterrhus, and no collection, 
in our museums or elsewhere in Australia contained identified 
specimens of Pascoe'si genus. The opportunity of a visit to the 
British Museum collection in 1907 enabled me to examine Pascoe's 
and Bates's types, while the examination of a large number of 
specimens makes it certain that there is no valid ground for 
retaining the genus name Hypocilihe as distinct, from Onosterrlms. 
Bates distinguished Hypocilihe from Onosterrhus by its more 
expanded and less convex form, the more deeply sulcata gula, and 
the cultriform apical joint of the maxillary palpi (which in 
Onosterrhus is triangulate) ; the submentum tooth is larger and 
the sides of the epi stoma more parallel. All these distinctions fail 
in my examination of the large number of species now available. 
The species of Hypocilihe are mostly very large, of Onosterrlms 
much smaller, so that characters like the tooth of submentum and 
the gular sulcus! are more evident in the former. The distinction in 
the apical joints of the maxillary palpi would be a good one if 
constant or definite, but I find it impossible to say exactly where 
such a joint ceasesi to be triangulate, and in this matter it depends 
very much on the position of this joint in relation to the preceding 
joints. Moreover, in no case can I find this joint to be truly cultri- 
form, even in the typical speciesi H. Macleayi (of which I feel sure of 
correct identification) ; it is rather securiform, or sub-triangulate in 
certain positions. In size, the described species of Onosterrlms 
vary from 12 mm. long (0. Icevis, Paisc.) to 18 mm. long (0. Batesi, 
Haag-Rut.), while those of Hypocilihe vary from 15^ mm. long 
(H. incorispiciia, Blackb.) to 23 mm. long (H. heroina, Blackb.). 
In form they vary from being widely ovate to elongate-ovate and 
sub-parallel, with varying degrees of convexity. I propose, there- 
fore, to merge the species of these two genera, and in future to 
