310 Mr. M. A. C. Hinton on the 
Tn the following table the Lumbo specimens are arranged 
in what, judging by the teeth, appears to be the order of 
individual age, commencing with the youngest. Specimens 
marked “G@” or “B” are in grey ov bright coats respec- 
tively ; the unmarked items are in intermediate stages of 
coloration :— 
. o 
a i 
3 3 
Sex.| No. Date. ia ue a Dentition. 
= 9 gg 
ot = =P 
ae ered ec 
= A = ne) 
86 | July 10,1918) 157 | 160 | 40 15 34'2 | ”-4 still in use. 
cote War ae mba 145 | 140 | 35 15 at Do. 
160 | 170 40 20 35'8 | ?-4 not quite in place. 
OL ene ak ae © 150 | 145 37 18 36°7 | P-4 slightly worn, 
aah ae os 138 | 138 | 37 167) 3r8 Do. 
CO tee oth Oe: 176 | 160 | 40 15 | 37:3 Do. 
202/|Sept.4, ,, 175 | 175 | 40 18 | 36:7 Do. 
July 10, ,, 175 | 170 | 365 15 | 36°8 | 2-4 moderately worn. 
Cee is vane ye 165 ip 40 as 36:1 | 2-4 about half-worn. 
oi | Rm he 170) FO™ |} 20 18 35°6 Do. 
Sy Pee EEL ee ag 175 Me 40 17 .. | 2-4 much worn. 
ee) 
oa 
on 
= 
404040404095 O95 +0 95 OY 
WDaaniacd 
ee) 
—- 
From this table it appears that the gradual change of 
colour described is not connected merely with differences of 
individual age. It seems also improbable that the change 
is a purely seasonal one. One may suspect, perhaps, that in 
this species each individual is subject to a constantly recurring 
cycle of colour-change, the incidence of which cycle depends 
rather upon the physiological condition of the individual than 
upon any general or extrinsic factor. 
P. f. mossamlbicus is certainly very closely related to, if it 
be not identical with, true flavivittis. Thomas mentions that 
the nasals of his type are considerably broader behind than 
in the skull of flavivitis figured by Peters ; this difference, 
although visible in some of the newly-arrived specimens from 
Lumbo, does not appear to be constant. In the bright phase 
of coloration mossambicus now seems to differ from flavivitiis 
inerely by having the posterior half of each lateral dorsal 
stripe white instead of yellow; but, having regard to the 
difference in locality, this fact will perhaps justify us in 
retaining mossambicus as a distinct subspecies pending the 
arrival of specimens from Mossimboa. 
