258 



Mil. G. A. BOULENGER ON MADAGASCAR 



of the species was drawn up by Mocquard in 1909*, but as this 

 key does not seem to me to work well and as the arrangement 

 therein followed does not at all express the natural affinities, I 

 have prepared a synopsis in which I have endeavoured to make 

 good these deficiencies,. so far as it is possible to do so in a linear 

 sequence. 



Synopsis of the Species of Mantidactylus. 



I. Glandular dorsolateral fold, if present, not confluent with the supratemporal 

 fold. 



A. Discs of fingers very small, usually smaller than those of the toes; snout 



rounded or very obtusely pointed, not or but feebly projecting beyond 

 the mouth ; loreal region oblique ; belly perfectly smooth, or very feebly 

 granulate behind. 



1. Toes entirely or nearly entirely webbed ; head broader than long ; back 



granulate. 



Tympanum hidden or small, very indistinct, and 

 distant from the eye ; tibio-tarsal articulation 

 not reaching beyond the eye; heels meeting or 

 not, when the limb is folded at right angles to 

 the body ; tibia 2J to 3 times as long as broad, 



2J to 2| times in length from snout to vent 31. guttulatus Blgr. 1881 f. 



Tympanum distinct, small and distant from the 

 eye; tibio-tarsal articulation reaching eye or tip 



of snout M. grandidieri Mocquard, 1895. 



Tympanum distinct, f diameter of eye ; tibio-tarsal 



articulation reaching posterior border of eye 31. inaudax Peracca, 1893. 



2. Toes \ to | webbed ; head as long as broad ; tympanum very distinct, f to 



| diameter of eye. 



Series of vomerine teeth nearly equidistant from 

 each other and from the choanse ; tibio-tarsal 

 articulation reaching eye ; heels meeting; tibia 

 2f to 3 times as long as broad, 2^ to 2f times 



in length from snout to vent ; back smooth 31. alutus Peracca, 1893. 



Series of vomerine teeth much nearer the choanse 

 than each other ; tibio-tarsal articulation reach- 

 ing tip of snout, or between eye and tip of snout ; 

 heels strongly overlapping ; tibia 3| to 4 times 

 as long as broad, If to 2 times in length from 

 snout to vent ; back with glandular longitudinal 



folds M. betsileanus Blgr. 1882 J. 



B. Discs of fingers small, as large as or larger than those of the toes; belly 



smooth or granulate only on the sides and behind. 



1. Head as long as broad or a little broader than long ; snout rounded or 

 obtusely pointed; toes at least % webbed. 



a. Tibio-tarsal articulation reaching tympanum or posterior border of eye ; 

 heels not overlapping; tibia 2\ to 3 times as long as broad, 2 to 

 2f times in length from snout to vent ; first and second fingers equal; 

 loreal region oblique ; back smooth or with indistinct flat warts ; belly 

 smooth. 



Tympanum i to f diameter of eye ; toes f webbed. M . curtus Blgr. 1882. 

 Tympanum § to f diameter of eye ; toes j to | 



webbed 31. biporus Blgr. 1889. 



* N. Arch. Mus. (5) i. p. 55. 



t Includes 31. piper Mocquard, 1900. 



X Includes 31. multiplicaius Boettg. 1913. 



