8 
Fam. LONGICORNES, Latr. 
Tribe Lamiaires, Latr. 
Subtribe Acanthoderit^, Thoms, (pt.). 
Group Acanthodermce. 
Genus Acrocinus, Illiger. 
(Thoms. Class, des Cerambyc. p. 28.) 
This genus, as revised by Thomson, is distinguished from 
Oreodera and all the allied genera by the simple femora. To 
this may be added that in Oreodera the basal joint of the an- 
tennae is almost always relatively shorter and more abruptly 
clubbed than in Acrocinus ; and the d fore tarsi are naked in 
the latter, whilst they are always fringed with hairs in the former 
genus. The anterior acetabular sutures are widely gaping. 
The face in all the species is short, being nearly twice as broad 
as long (measuring the length from the top of the antenniferous 
tubercles) ; the muzzle is widened from the eyes downwards, 
and the lower angles are prominent. The eyes above nearly 
meet on the vertex, being separated only by the central line ; 
below they reach the central line of the forehead only in one 
species (A. longimanus) , in the others being widely separated. The 
fore and middle tibial grooves, with their accompanying tubercles, 
are removed to very near the apex of the tibiae in A. longimanus ; 
in A, trochlearis and A. accentifer they are largely developed, 
especially in the 6 . The fore legs are covered with granula- 
tions and elongated in the 6 of the two species just named, 
and the tibiae have a row of tooth-shaped projections along their 
under- surface. In A. longimanus the same legs are tubercu- 
lated in both sexes, the denticulations of the tibiae are very 
large (extremely so and recurved in the $ ), whilst the fore legs 
of the S reach an excessive length, the femora having also a 
strong tooth-shaped projection on the upper surface near the 
base, which does not exist in the 6 of the other species. The 
thoracic lateral spines are long, acute, and retrocurved in A, 
longimanus in the other species they exist only as points at the 
apices of the lateral tubercles. There are several other points of 
difference between O. longimanus and its congeners; but I think 
they are not of a nature to warrant the institution of a separate 
genus ; the species must be viewed rather as a highly developed 
and exaggerated form of the generic type. 
An erroneous statement has been made and repeated by 
authors with regard to the thoracic tubercles of A. longimanus, 
to the effect that they are moveable. Such a structure would 
be curious in the highest degree, but it does not seem to have 
excited attention sufficient to lead to further examination. It 
