228 Mr. J. O. Westwood’s Descriptions , 
minimo, 2ndo duobus sequentibus longiori, 5to latiori ad apicem 
subtus in spinam parvam producto; unguibus valde curvatis. 
Plate XVI. fig. 2, Arachnodes nitidus ; 2a, instrumenta labialia; 2b, labial 
palpus; 2c, antenna; 2d, anterior tarsus; 2¢, pos- 
terior tarsus. 
The Circellium clypeatum of Laporte, (Hist. Nat. Ins. Col. vol. 2, 
p. 67,) will form another subgenus, distinguished by its very de- 
pressed form, short prothorax, having the sides rounded, the elytra 
striated, the mesosternum channelled down the middle, and the 
tibiz very much curved. 
The insects above described ‘are of comparatively large size, 
being more than half an inch long and of splendid green tints ; 
but there are several much more minute species of a black colour, 
also natives of Madagascar, which are, in fact, the pygmies of the 
family of the sacred beetles, not exceeding one-eighth of an inch 
in length. They may be characterized thus :— 
Nanos, Westn. 
Antennarum clava brevis, subrotundata. Mentum in medio latius, 
antice valde emarginatum. Palpi labiales brevissimi, lati ; 
articulis 1 et 2 fere eequalibus, 3tio minimo. Prothorax late- 
yibus fere rotundatis, haud reflexis. lytra prothorace 
evidenter latiora, fere rotundata, levissime striata. Pedes 
parum elongati, subleeves. Femora postica subovalia. Tibie 
anticee curvate, depresse, sensim latiores, apice extus 3-den- 
tate; tibize 4 posticee curvate, versus apicem paullo latiores. 
Tarsi antici mediocres, 4 postici longiores, ungwibus valde 
curvatis. 
Circellium pygmeus, Laporte, Hist, Nat. Col. 2, p. 67, is the 
type of this subgenus. 
Plate XVI. fig. 3, Nanos pygmeus; 3a, instrumenta labialia; 3b, labial 
a palpus; 3c, posterior tibia and tarsus. 
The remaining groups, which I propose to describe in this com- 
munication, belong to that section of the Scarabeide which possess 
short and triangularly dilated posterior tibiz, and the tarsal joints 
of the hind feet gradually narrowed, of which Copris is the typical 
genus. 
Macroperes, West. 
Corpus fere hemisphericum. Clypeus antice emarginatus, 
laciniis obtusis, postice transverse carinatus. Mentum sub- 
