42 ON THE CETONIIDiE OF SOUTH AFRICA. 
and subacuminate at apex. The pseudonychia are large and conspicuous. The mentum, 
however, is here not deeply emarginate as in Goliathus, but, on the contrary, rather convex 
in front, so that we have arrived at another sub-genus which has been called Ichnestoma, by 
M. Gory; but as this gentleman has favoured us with the derivation of the word which he 
intended to write, I shall correct his mistake, and call the 
Sub-genus 4. Ischnostoma, G. P. 
75. It is true, that taking a more extended view of natural affinities than M. Gory, I have 
given greater latitude, than he has done, to the groupe here called Ischnostoma, but I do not, 
on that account, conceive myself entitled to deprive that entomologist of the credit of naming 
this curious sub-genus. Ischnostoma is distinguished from Goliathus, by the mentum never 
being deeply emarginate, and from the sub-genus Cetonia, by the terminal lobe of the maxilla 
being excessively small, and almost evanescent. This lobe, as may be expected, is largest in the 
two aberrant sections which lead to Goliathus and Cetonia ; but still is short, in proportion to 
what we find it to be in those two sub-genera generally. The mandibles here are peculiarly 
small and rudimentary, as is also the labrum, which is of a singular form in the typical 
sections, -a form which indeed is different from that of the labrum in all other Cetonudm. The 
mentum is never emarginate, but in general convex at the apex. All the known species are of 
a black hue, that makes them little interesting except to the entomologist. From the grains 
of sand which I have generally found adhering in quantity to the hair which covers the under 
side of many of these insects, we may imagine that they are inhabitants of a sterile country. 
Schdnnherr, Latreille, and, more lately, Klug, have all placed certain insects which belong to this 
sub-genus close to the genus Goliathus of Lamarck. 
B. — Epimeron distinctlyvisi- 
ble between the elytra and^ 
thorax. Mentum never 
with an acute apex. 
SECTIONS OF ISCHNOSTOMA. 
/-I CcELOCEPHAL.®, M‘L. 
2 Xl PH OS CEL IDE. E, M‘L. 
3 Arcade.®, M‘L. 
A. — Epimeron not very con- j 
C 4 HETEROCLIT.E, M‘L. 
spicuous between the elytra^ 
and thorax. Mentum tri- | 
angular with acute apex. ^5 Cuspidate, M‘L. 
Clypeus homed. Mentum convex in front. 
{ Clypeus not horned. Thorax narrower than elytra. Men- 
tum broader in front. 
f Clypeus not horned. Thorax at base as wide as the elytra. 
Mentum sub- emarginate. 
{ Sides of clypeus not sinuated. Mentum rather short and 
wide. Clava of antennse very short. Anterior tibiae 
tridentate externally. 
("Sides of clypeus sinuated. Mentum long, narrow. Clava 
of antennse very long. Anterior tibiae externally bi- 
dentate. 
1 
76. The first of these sections, here called Ccelocephalje, contains two known species which 
MM. Gory and Percheron have erroneously assigned to their genus “ Diplognatha.” The 
Cetonia geotrupina of Schonnherr is possibly a third distinct species. The maxilla here, how- 
ever, has no tooth on the inner process, like Diplognatha ; and if there be any thing like a 
tooth on the outer process, of which I am not quite sure, it appears to be merely the acute 
corner of the horny part which stretches beyond the pencil of hairs. However, I think this 
must be an approach in some degree to the structure of Diplognatha ; and although I am not 
prepared to say with M. Gory that it belongs to that sub-genus, I certainly eonsidei it as 
evidently serving to connect the genera Macrominus and Cetoninus by what is called the 
