G. H. F. Nuttall 
77 
the chitinous exoskeleton remains translucent. The body of the tick is 
now greyish, with a brownish scutum having dark lateral fields. After 
8-9 days the appearance has altered little, the gut is more contracted, 
the palps and base of hypostome are more intensely coloured and the 
black and orange-red markings on the legs are more distinct. 
In replete females the only change observed affects the body, which 
assumes a slate-grey opaque appearance. 
Nymph. The freshly emerged nymph is sluggish; it possesses 
a black body and pale glassy legs which, after 24 hours, acquire a dull 
straw colour, whilst the intestine proceeds to partially empty itself. 
After 48-72 hours the nymph grows livelier, the gut is more contracted, 
the hypostome and legs are darker. After 5-6 days the capitulum and 
legs show the same colouration as in the female, the palps being, 
however, only slightly bluish distally; the intestine has been further 
emptied (Fig. 2 h), and the tick runs about actively. When replete, 
the nymph’s body assumes a light slate-grey colour. 
Larva. The larva of /. putus was described by me from replete 
specimens {Parasitology, v. p. 60) collected in 1911. Last year (1912) 
we fortunately succeeded in obtaining larvae from eggs which were laid 
by females (Lot 1703) in the laboratory. There is nothing material to 
add to the specific description of the larwa, but it may be noted that 
unfed larvae are exceedingly pale and translucent, resembling recently 
emerged Argas persicus larvae in this respect. The arrangement of 
the intestinal caeca is shown in Fig. 2 a. In specimens that had fasted 
for some time two broad and shallow depressions are seen to run 
longitudinally along each side of the dorsum, the middle of the dorsum 
being convex and the body margins somewhat raised. When alive and 
at rest, the body of the larva measures, on an average, O'oo x 0‘45 mm.; 
the larvae, however, show some variation in size, as will be seen from 
the appended measurements of ten larvae picked out because of apparent 
Larva No. 
Length 
Width 
1 
0-53 mm. 
0-44 mm. 
2 
0-54 
0-4.5 
3 
0'55 
0-45 
4 
0-55 
0-45 
5 
0-55 
0-45 
6 
0‘55 
0-38 
7 
0-55 
0-46 
8 
0-58 
0-45 
9 
o-co 
0-43 
10 
0-60 
0-43 
