ON THE CETONIIDiE OF SOUTH AFRICA. 
17 
great lovers of sand on the banks of rivers, and so far as my observation has gone, they are 
not authobious. This genus is nearly the same in extent as the genus Cremastocheilus of 
Gory and Percheron, and is easily known by the first joint of the antennae being large, 
triangular, and broad. I am acquainted with the following sub-genera. 
£>ul) --genera* 
B.- 
-Clypeus not plain and 
not semicircular. 
1 Cremastocheilus, Kn. 
2 Cyclidius, M'L. 
3 Genuchus, K. 
A.- 
-Clypeus plain semicir- j 
cular. 
Cymophorus, K. 
Cryptodus, M'L. 
f Prothorax quadrate, with the angles acute. Vertical pro- 
cess of mention hollow, oval, pelviform. Fore tibiae 
bidentate. North America. 
C Protliorax orbicular. Vertical process of mentnm trian- 
J gular and hollow. Fore tibise bidentate. South Ame- 
I rica. 
C Prothorax subquadrate, with sides and angles rounded off. 
J Vertical process of mentum triangular and flat. Fore 
tibiae trideutate. Africa. 
f Antennse ten-jointed, 
lobate shoulders. 
Anus with spines. Elytra with 
l 
f Antenmc with nine-joints. Anus without spines. Elytra 
with parallel sides. New Holland. 
26. All the foregoing five sub-genera agree in the clypeus having a reflexed margin in 
front. They agree also in the curiously dilated triangular scape of the antennae, and in the 
epimeron not being prominently distinct between the thorax and shoulders of the elytra. 
Sub-genus 1. Cremastocheilus, Knoch. 
27. This groupe answers to the genus Cremastocheilus of Knoch, Latreille, and Kirby ; but 
it is here reduced to its proper rank, that of a sub-genus only. It differs from the other 
sub-genera in having the vertical process of the mentum hollow, and basin-shaped, while the 
terminal process of the short maxilla, is a straight blunt tooth, and the inner process is a sharp 
minute tooth surrounded with a few hairs. These insects are North American, and differ 
in their manners from the Cetoniida in general, but probably agree in this respect with all 
the other sub-genera of Cryptodinus. The species of Cremastocheilus are not common. In 
company with Dr. Pickering, and Mr. Titian Peale, I found C. castanca of Knoch, in 
June, 1836, on the banks of the Delaware, on the new Jersey side, opposite to Philadelphia. 
These singular beetles are never found except flying, like Cicindelce, over the sand which there 
lines the bank of that noble river. They are certainly not flower-frequenting insects, and 
what they find in the sand to their taste I do not know. Mr. Kirby has made some 
good remarks on this sub-genus in the third volume of the Zoological J ournal ; only without 
giving any sufficient reason for so doing, he has termed that part the labium which Latreille 
has called the mentum. I am not acquainted with the sections into which Cremastocheilus 
may be divided. 
Sub-genus 2. Cyclidius, M'L. 
28. To this groupe belongs C. elongatus of Olivier, and C. axillaris of Dupont. I shall add 
another species which stands in my cabinet as C. Nero. It is as large as Platygenia Zairica, 
and of a velvetty black hue, with two large long nitid and blood-coloured spots in the middle 
D 
