426 Mr. Hugh Scott on a large series of 
rise to the erroneous conception that C. sykesi has 3 large 
lateral tubercles on either side of the abdomen in addition 
to the 4 central ones. 
One may say, then, that the females of this series are 
remarkably constant, except with regard to the large 
dorsal tubercles. There is no variation sufficient to 
cause hesitation in referring all the individuals to the 
same species. When a distinct species, C. horsfieldi, is 
compared with the specimens, it is at once seen to be 
separated from them by perfectly well-marked characters. 
These are, the different arrangement of the long bristles 
on the posterior part of the abdomen: and the presence 
of a group of conspicuous moderately long bristles, 
placed ventro-laterally on either side of the penultimate 
abdominal segment, and extending backwards some way 
from its base;* the bristles in this region are not con- 
spicuously elongated in C. sykesi. 
Maue.—Length 43-42 mm. Head dark red-brown, bearing 
short bristles ; palps with long bristles. Sides of the thorax whitish, 
the central portion darker posteriorly. Under-side of the thorax 
reddish-brown, covered with short bristles. Coxe, trochanters, and 
femora distinctly lighter in colour; the femora dark apically, as 
in the female. Some immature specimens have the integument in 
a soft condition, and are very light-coloured, the legs and under-side 
of the thorax being especially pale. 
Dorsal surface of abdomen. Very dark red-brown (excepting 
base of first segment), the anal segment slightly lighter and more 
shining. Extreme base of the basal segment whitish, bearing a 
group of dark rudimentary bristles ; behind this a portion of the 
segment free from bristles; posterior portion with 4 rows of 
very short bristles at some distance from one another. Second 
and third segments almost equally long, the third often slightly 
more stretched out, their surfaces bearing scantily-distributed very 
short bristles. Fourth and fifth segments short, their surfaces free 
from bristles. Anal segment described below. Hind margin of the 
first segment without bristles except at the lateral angles, where 
there are on either side about 7 long bristles. Hind margins 
of the 2nd, 3rd, 4th and 5th segments bordered with long bristles 
at the sides, free from bristles for a considerable space in the 
middle. 
Ventral surface of abdomen. First segment bearing a short 
basal row and 3 long rows of short bristles, and bearing the 
* De Meijere, op. cit., Text-fig. 1. 
