Gr. H. F. Nuttall 
197 
nymphs which developed from fully fed larvae (B) were similarly allowed 
to feed either (E) partially, or (F) completely. The adults of Set I 
had, therefore, developed from larvae and nymphs which had not been 
allowed to feed to repletion ; the adults of Set II had developed from 
incompletely fed larvae which, as nymphs, were fed to repletion; the 
adults of Set III had developed from larvae fed to repletion which, as 
nymphs, were incompletely fed ; whereas the adults of Set IV (controls) 
developed from larvae and nymphs which had both been fed to re¬ 
pletion. 
Fig. 1. Rhipicephalus appendiculatus, unfed larva: dorsal and ventral aspects, 
tarsus 4. Lot 2149. G.H.F.N. del. 
Variation in Nymphs ( R. appendiculatus). Fig. 2. 
Of the partially fed larvae in Lot A a certain number died owing to 
the mechanical injury they had sustained in being forcibly removed 
from the host. Those that survived and underwent metamorphosis 
varied considerably in size as will be seen by reference to the following 
table in which measurements of the nymphs which emerged in Lot A 
and Lot B are given. 
The following measurements are in mm., the length and breadth of 
the body being given exclusive of the capitulum. The unfed nymphs, 
which were all measured whilst alive, are arranged in order of size : 
