25 
N. OUNLIFFE 
plexity of dentition, correlated with an increasing size of hypostome and they 
are of much the same order in both species. 
In many cases the teeth are not arranged symmetrically on the two sides 
of the hypostome, the rows on one side appearing to alternate with the rows 
on the other side. 
(b) The Legs and Spiracle. Figs. 2 and 3. 
Outlines of the terminal portions of the fourth legs and of the spiracular 
plates are shown in Figs. 2 and 3 respectively, for the following stages, namely, 
first to sixth nymph (a) to ( /); males from third and fifth nymphs (h) and (i ); 
and females from fourth and sixth nymphs ( j) and (k). 
1 m m. a to c 
Fig. 2. Ornithodorus savignyi, tarsi of fourth legs, in lateral aspect: (a) to ( /) of 1st to 6th stage 
nymphs; ( h ) and ( i ) of males from 3rd and 5th stage nymphs; (j) and (k) of females from 
4th and 6th stage nymphs. (N. C. del.) 
The degree of development of these structures at each stage is similar in 
the two species, 0. savignyi and 0. moubata and needs no further discussion. 
SUMMARY OF RESULTS. 
1. The biology, as studied under laboratory conditions, of 0. savignyi is 
very similar to that of 0. moubata. 
2. Females may oviposit over 400 eggs, of which at least 60 per cent, may 
be fertile; parthenogenesis does not occur. 
3. An increase in temperature of 8 r C. (from 22° C.) decreases the longevity 
