198 
Variation in Ticks 
Measurement of Nymphs which emerged. 
A. Prom partially gorged larvae. 
No. 
1 
2 
3 
4 
5 
6 
7 
8 
9 
Average 
Length 
0-8 
0-84 
0-92 
1-0 
10 
1-08 
1-28 
1-28 
1-4 
1 07 
Width 
0-52 
0-64 
0-6 
0-68 
0-8 
0-8 
0-92 
0-68 
1-04 
074 
From normally gorged larvae. 
Length 
1-28 
1-32 
B. 
No. 
1 
2 
3 
4 
5 
6 
7 
8 
9 
Average 
1-32 
1-32 
1-32 
1-32 
1-36 
1-44 
1-44 
1 35 
Width 
0-92 
0-88 
0-88 
0-88 
0-84 
1-0 
1-0 
0-92 
0-92 
O 92 
Fig. 2. Iihipicephalus appendiculatus, nymphs: (a) normally developed unfed specimen, 
dorsal and ventral aspects, spiracle and tarsus 4 ; (b) capitulum and scutum of nymph 
which emerged from a larva removed from the host before it had fed to repletion. 
Lot 2149. G.H.F.N. del. 
The smallest of Lot A (No. 1) was only 62°/o as long as the smallest 
of Lot B (No. 1), and the larger specimens of Lot A (Nos. 2-6) only 
attained 84°/o °f the length of Lot B (No. 1). Lot A Nos. 7 and 8 were 
about as large as the smallest of Lot B, and only one of Lot A (No. 9) 
attained a normal size. The variation in size in Lot A was therefore 
very considerable, the difference in length between the smallest and 
largest being as 57 :100, whereas in Lot B the difference was only as 
