L. Harrison 
387 
The abdomen., in shape, appearance, and general arrangement of the 
chaetotaxy, is very like that of Heterodoxus ; from which, however, it 
differs in the terminal segments, and in having the two anterior segments 
devoid of stigmata, in place of the first only. It is widest at the fourth 
and fifth segments, and the posterior end is more or less rounded in both 
sexes. The pleura are clearly marked off, their borders bearing a 
narrow lateral band, swollen on its inner face at half its length. Wide 
transverse bands cross each segment. The general shape and disposition 
of the markings will be apparent from Fig. 16. The last segment of 
the d is flatly rounded, the tergum with a scattered fringe of a dozen 
hairs, longer externally; the sternum densely fringed with short hairs. 
The tergum of the last complete segment of the $ has the shape of a 
truncated cone, with rounded angles and fiat hind margin, with about 
three hairs on each side. Beneath this projects a plate of somewhat 
similar shape, but narrower; densely fringed with hairs, which are 
short in the middle, but increase in size outwards, culminating in a 
dense pencil of about twenty strong hairs on either side. On the 
ventral side of this plate is a raised area, fringed with hairs and strongly 
denticulate, which may be part of the plate, but seems to be definitely 
sutured off from it. Whether these structures together represent the 
ninth sternum, or whether the posterior part represents a reduced tenth 
segment, I am unable to say without cutting sections. The genital 
aperture is covered by a broad transverse flap, carrying a fringe of 
short hairs, and, inside its margin, a pair of very stout hairs enclosing 
two short hairs and a patch of denticles. Lying between the seventh 
and eighth segments, close under the sterna, is a large transversely 
elongated bean-shaped ring of chitin, which may really be a ring, or 
may represent the thickened edge of a plate. 
The appearance of the d genitalia is shown in Fig. 16. I have not 
attempted to homologise the parts of this asymmetrical apparatus, the 
only easily recognisable features of which are the large unequal parameres 
and a very elongate ‘preputial sac,’ running through four segments, its 
wall densely covered with denticles, smaller in front and large behind. 
Chaetotaxy of $. Head with two short hairs close together in front; 
two fair-sized hairs, one directed outwards and one backwards, with 
two or three smaller ones in front of the frontal cleft; internal to these 
a medium and a small hair overlying the base of the antenna; a few 
short hairs scattered over the dorsal surface; temporal angle with three 
long, one medium, and a number of short hairs, with a fringe along its 
ventral continuation, forming a dense comb-like group under the eye, 
