522 Mr. T. Vernon Wollaston on the 
24. MiCROTRiBUS {nov. gen.). — Tlie very remarkable 
little Cossonid for which the present genns has been 
established is from the collection of Mr. Pascoe, and was 
captured by my nephew. Captain F. W. Hutton, in the 
Waikato district of North Island in Xew Zealand ; and 
it is peculiarly interesting as adding another well-defined 
type to the escutellate section of the Pentarthrides in which 
the eyes are nevertheless fully developed. In its fusiform 
outline, dark-piceous hue, slightly shining surface, and 
rather shortened, subconcave metasternum, it is in entire 
accordance with most of the immediately-allied genera ; 
but it is conspicuous for its rostrum being rather narrow, 
elongated, and parallel, for its eyes (although small) being 
prominent and less wide apart from each other than is 
usual, for its prothorax being oval, regularly rounded at 
the sides, and largely developed, and for the second joint 
of its exceedingly lax fliniculus being very appreciably 
lengthened, and the third one of its feet much expanded 
and deeply bilobed. But one of its most significant 
features consists in the fact that, whilst the rest of its 
body is completely bald, the base of its elytra and the 
extreme hinder margin of its prothorax are studded, in 
unrubbed specimens, with a few very fine, elongated hairs, 
— thus feebly shadowing-forth what is so strongly ex- 
pressed in the nearly-blind Pentatemni (of the Atlantic 
archipelagos), and still more so in Halorhynchus (fi-om 
Avestern Australia), the anomalous Onyclwlips (of the 
Canarian group), and the jMadciran genus Lipommata, — 
the last three of which are totally devoid of sight. 
Whether however it at all indicates (as I am rather 
inclined to suspect) a sand-infesting mode of life, as it 
clearly does in the groups to which allusion has just 
been made, I have no positive information. The exact 
]josition of Microtrihus, amongst the various forms which 
up to the present time have been made knoA\Ti, appears to 
be between Microxylohius, from St. Helena, and Mesoxe- 
nomorphus from southern Africa. 
It has given me great pleasure to name the type of this 
interesting genus after Captain Hutton, to whose inde- 
fatigable researches we are gradually becoming indebted 
for a more complete knowledge of the New Zealand fauna 
than has hitherto been brought to light. 
25. ISlESOXENOMORnius {iiov. yen.). — The three ex- 
amples for the reception of which I have been compelled 
