260 MK. G. A. BOULENGER ON MADAGASCAR 



Toes i webbed ; inner metatarsal tubercle strong 



and prominent, compressed, 2 to | length of 



inner toe; no dorso-lateral fold M. redimitus B\gv. 1889. 



b. Tibio-tarsal articulation reaching beyond tip of snout; tibia 4^ to 

 times as long as broad, Ij to If times in length from snout to vent ; 

 loreal region oblique. 

 Toes nearly entirely webbed ; inner metatarsal 



tubercle ^ length of inner toe ; tympanum i to 



t diameter of eye ; a pair of inwardly curved 



glandular folds on the anterior third of the back, 



from the upper eyelids ; heel with a dermal pro- 

 cess or spur ^^- Jiiteus Metli. & Hew. 1913. 



Toes i to f webbed ; inner metatarsal tubercle k to 



I length of inner toe ; tympanum i to | diameter 



of ej-e ; a curved glandular fold on eacli side 



from the upper eyelid to between the shoulders, 



followed by a straight fold -M". pUciferus Blgr. 1882. 



Toes \ webbed ; inner metatarsal tubercle f to J 



length of inner toe ; tympanum f to J diameter 



of eye ; upper parts rough with prominent glan- 

 dular folds and tubercles; heel with a dermal 



process or spur Jf. orspej- Blgr. 1882. 



II. Glandular dorso-lateral fold extending from 

 behind the eye to the hip ; loreal region ver- 

 tical ; tympanum f to once diameter of eye ; 

 discs of fingers and toes rather large ; tibio- 

 tarsal articulation reaching tip of snout or a 

 little beyond ; tibia 4| to 5 times as long as 

 broad, If to 1^ times in length from snout to 

 vent; toes i webbed ; belly granulate behind. M. albofrenatns F. Miill. 1892*. 



Nothing is known of tlie development and larvte of these frogs, 

 but the eggs are remarkably large, measuring 5 mm. in diameter 

 in M. guttidatus ($ 120 mm. from snout to vent), 3 mm. in 

 M. luguhris ( $ 50 mm.), 2-5 mm. in M. betsileamcs ( $ 33 mm.). 



Mantidactylus ambohimitombi, sp. n. 



Vomerine teeth in short transverse or oblique series behind the 

 level of the choanal, equidistant from the latter and from each 

 other. Head a little broader than long ; snout rounded, feebly 

 proiecting beyond the mouth, with indistinct can thus and very 

 oblique, concave loreal region ; nostril equidistant from the eye 

 and from the end of the snout ; interorbital region as broad as or 

 a little narrower than the upper eyelid ; tympanum distinct, f to 

 f the diameter of the eye, 1 to IJ times its distance from the 

 latter. Fingers moderately long, first and second equal or first a 

 little the longer, the discs small, not very much larger than the 

 well-developed subarticular tubercles. Toes moderately long, 

 f webbed, the discs about as large as those of the fingers ; no 

 tarsal fold ; inner metatarsal tubercle oval, moderately promi- 

 nent, i to I the length of the inner toe; no outer tubercle. 

 Tibio-tarsal a,rticulation reaching the eye or betAveen the eye and 

 the nostril ; tibia 2| to 3 times as long as broad, 14- to 2 times in 



* M.frenatus Boettg., 1913, is probably identical with this species, although the 

 hind limb is longer and the discs of the fingers and toes are described as very small. 



