Annals of the Transvaal Museum, 
57 
snout), and certainly cannot be used to distinguish tricolor from madagas- 
cariensis. The colour in our specimens has changed according to the 
preservatives used. Those preserved in formalin for some time and 
then changed to alcohol have now the colour as described for madagas- 
cari easts though in life they were as depicted in the sketch reproduced 
on Plate X. Some received lately had been preserved only in alcohol 
and still retain the colours as given for tricolor. 
It seems to us well possible that these two species mentioned are not 
distinct. 
A constant feature in the markings in our specimens is a broad black 
streak which passes from the tip of the snout to the eye, sometimes 
extending to the tympanum, and in one or two specimens continued as a 
broken line along the sides of the body in its anterior half. Many of our 
specimens have more or less distinct (in a few cases very distinct) granules 
at the angle of the mouth. 
The webbing of the fingers in most of our examples might be 
described as one-quarter to one-half in extent, in which respect they 
would appear again to resemble tricolor. 1158-1201. 
Family DENDROBATIDAE. 
Genus M A NT ELL A, Blgr. 
M. ebanaui, Bttgr. ( =M, . betsileo , Grand .fide Mocquard, 13, p. 66). 
Eleven examples from the eastern region. Our specimens agree exactly 
with the description and figures given by Bottger for this species (6, p. 519, 
PI. Y, fig. 20). 1202-1211, 1213. 
In the collection there are also ten juvenile specimens of Mantella 
probably referable to this species. 1228-1237. 
M. baroni, Blgr. (Plate X). Twenty-eight examples from the eastern 
region : localities, Analamazotra, Ambohidratrimo, and Folohy. 
In colouration our specimens agree precisely with the description 
given by Boulenger (7a, p. 106) : however, they differ therefrom in that 
the back is not strictly smooth, being in fact very finely chagrined. 
Except in the slight differences of colouration we are unable to recognize 
any difference between M. cowani, Blgr., and M. baroni , judging by the 
descriptions. 
We note that the belly may be without any light spots, and that the 
black cross on the back in some is not clearly indicated. 966-984, 
1220-1227, 1238. 
M. auriantiaca, Mocq. Fourteen examples from Ambatoharanana. 
In all our specimens with one exception there are granular glandula- 
tions behind the thighs ; in several there is a trace of a dorsal median fold 
or ridge on the back which starts on the head or between the shoulders 
and loses itself near the vent. The tibio-tarsal joint of the adpressed hind 
limb may (rarely) reach the eye. We note that the character of the 
nostril, being slightly nearer the tip of the snout than the eye, is constant 
in our specimens. 
The orange-vermilion colouring in life of this species is soon lost 
after preservation. 1251-1264. 
Mantella laevigata, sp. nov. (Text fig. 2). Seven examples from 
Folohy. The specimen now described as new we at first identified as 
M. betsileo , Grand., but as that species is placed by Mocquard as identical 
with M. ebenaui , Bttgr., of which we possess typical examples undoubtedly 
