258 MR. 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 expi-ess the natural affinities, I 

 have prepared a synopsis in which I have endeavoured to make 

 good these deficiencies, so fai- as it is possible to do so in a linear 

 sequence. 



Syno2)sis of the 6'/>ec/es o/"Mantidactylus. 



I. Glandular dorso-lateral 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 bodj' ; tibia 2^^ to 3 times as long as broad, 



2^ to 2| times in length from snout to vent M. guttitJatus Blgr. 1881 f. 



Tympanum distinct, small and distant from the 



eye; tibio-tarsal articulation reaching eye or tip 



of snout Jf. ^raMfZjf^i'eri Mocquard, 1895. 



Tympanum distinct, J diameter of eye ; tibio-tarsal 



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



2. Toes i to § webbed ; head as long as broad ; tympanum very distinct, f to 



f diameter of eye. 



Series of vomerine teeth nearly equidistant from 



each other and from the ohoanse ; tibio-tarsal 



articulation reaching eye ; heels meeting ; tibia 



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



in length from snout to vent ; back smooth M. ahitus Peracca, 1893. 



Series of vomerine teeth much nearer the choanoe 



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. 1882t. 



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 3 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 2 to f diameter of ej'e ; toes f webbed. M. ciirtus Blgr. 1882. 

 Tympanum f to f diameter of eye ; toes i to J 



webbed 31. biporus Blgr. 1889. 



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



+ Includes 31. pic/er Mocquard, 1900. 



X Includes 3£. mtdtiplicatiis Boettg. 1913. 



