50 
Annals of the Transvaal Museum. 
R. LABROSA, Cope. Nine examples from Antolanbiby, near Betsioky, 
Province of Tulear. All the specimens were obtained during the month 
of September below the surface near a small pond while excavating for 
subfossil remains of Lemuroids. 
To the characters cited by Mocquard ( 11 , p. 104) by which R. labrosa 
may be distinguished from R. natcilensis , Smith, namely the presence of 
a round tubercle near the tibio-tarsal joint, and the nature of the dorsal 
cutaneous folds, we are able to add another character to be found in the 
males during the breeding season, a character which is not repeated in 
R. natcilensis. Scattered all over the ventral surface in the male there 
Text Fig. 3. Male Ua na labrosa , Cope, showing asperities on ventral surface and on thumb. 
are very small black spinous asperities which extend on to the thighs, arms, 
and upper side of the fingers: even on the dorsal surface these asperities 
occur sparingly; but it is on the thumb that these structures are most 
clearly seen, being developed as warts and spines set closely (text fig. 1). 
930-938. 
Genus MANTIDACTYLUS, Blgr. 
Owing to the want of comparative material we have been forced to 
reject the idea of assigning a score or so of specimens to any known 
species after many ineffectual attempts to do so, although we have had 
access to the original descriptions of the species given by all the authors 
except that of F. Muller. * Moreover, after a careful study of the key given 
by Mocquard ( 13 , pp. 55, 55), of the original descriptions especially those 
of Peracca, and of our own specimens, we believe that many of the species 
of Mantidactylus , as the genus is known at present, are separated by 
* Vide Addenda (p. 60). 
