222 Transactions. 
by a membrane for a third or more of its upper portion to the tibia 
(figs. 21, 22). The lower part is armed with the usual fringe of hairs, but near 
its centre it is broadly and deeply convex. The tibia is somewhat flattened, 
and bears an oblique groove which passes beneath the comb, forming with 
the convexity of the latter a covered channel through which the antenna 
can be drawn. Fitting into the convexity of the strigil is a dense bunch of 
hairs, the whole forming a cleaning-apparatus with comb above and brush 
below. That this type of strigil is correlated with the usual type of 
antennal armature in the Melanchrinae seems still more probable when the 
genus Ichneutica is examined (fig. 23). Here the antennal segments are 
ARCTIIDAE. 
In the Arctiidae the antennae are usually small, and have little armature. 
The strigil, which is usually not highly developed, shows in some forms, as 
Schistophleps (fig. 24), the same extension of the attaching membrane as 
in the Melanchrinae. Comarchis and Celama also exhibit this character, 
though in a less degree. Ardices possesses an unusual type of strigil for this 
family, it being long, free throughout the entire length of the lower fissure, 
and covered outwardly with dense hair-scales (fig. 25). Metacrias a 
displays a peculiar strigil. The tibia in this genus is very short; it is also 
somewhat eurved and hollowed out beneath. In this convexity, its base 
being deeply sunk in the limb, lies a broad naked strigil (fig. 26). 
SYNTOMIDAE. 
The Syntomidae offer no unusual strigilar features, the organ being 
rather small, centrally folded, and broadly lanceolate, with the usual fringe 
of hairs on the outer margin. 
NOTODONTOIDEA. 
NOTODONTIDAE. 
In Neola semiaurata Walk. the strigil in the male is strongly concave to 
the tibia and follows a somewhat spiral course. In Epi tristis Lewin 
the organ is also concave, but has no spiral twist (fig. 27). In the females 
of both these species the strigil is absent, as it is also in the very peculiar 
Ochrogaster contraria Walk. 
SPHINGIDAE, 
_The hawkmoths have a well-developed strigil occupying the middle 
third or more of the tibia. It is бездин ыд the is sec er folded, and 
bears a fringe of stiff spines on the margin of its inner fold (Plate 18, fig. 2). 
Though the edges meet, they are not fused except towards the apex. The 
organ is deeply set in the tibia at the base, and is almost entirely exposed 
(fig. 28). In etamimas australasiae Don., however, the fringe of hair 
which in all species occurs on the outer side of the tibia is curved round, 
the lengthened upper part of it acting apparently as a spring to keep 
pressure on the strigil, and the lower part forming a rounded channel to 
receive the antenna (Plate 18, fig. 1). 
