AND BATllACHIA FROM MADAGASCAR. 35,5 



In 1913 (2) we pointed out that we strongly suspected liana 

 lahrosa to be the onl}^ truly endemic Ranid in Madagascar which 

 was not supplied with the supernumerary phalanx to the digits ; 

 and that Bottger's " Arthroleptis (flemimantis) horrichis " belonged 

 to the same genus as our " Trachy mantis {Microj^hryne) mala- 

 gasia." In 1914 I had an opportunity of examining Bottger's 

 type at Frankfort with Dr. Sternfeld : we were both of opinion 

 that Arthrol&ptis horridus should be referred to our gen^s, and 

 that tlie two species horrida and onalagasia were very closely 

 allied. This fully coniirmed our presumption as to Madagascar 

 Ranids *. 



Besides the differences cited in the two original descriptions, 

 the following distinctions were noticed : in T. malagasia the snout 

 is slightly longer as compared with the diameter of the eye and 

 more pointed than in T, horrida ; hi the latter species the discs 

 of the digits are larger than in T. malagasia. The tympanum in 

 T. horrida is more visible and a shade larger than in the other 

 species, The femurs in T. horrida are glandular, but lack the 

 huge glands of T. malagasia which we suggested might be an 

 abnormal development. In Bottger's species the granules on the 

 venti'al surface end in a sharp point ; they might almost be 

 described as small pointed tubercles : in our species they are 

 replaced by swollen granules of larger size. 



Manxidactylus argenteus, sp. n. 



This species falls into the group with large discs to the fingers, 

 and with granular belly (1) : nearest ally seems to be A[. granu- 

 latus : the upper surfaces have however no asperities. 



Description. — Head flat and depressed, longer than broad ; 

 snout subacuminate, practically pointed, strongly projecting 

 beyond the mouth ; nostril considerably nearer tip of snout than 

 eye ; distance from eye to nostril i diameter of eye. Tympanum 

 distinct, | diameter of eye. Interorbital space a fraction greater 

 than breadth of upper eyelid, equal to diameter of tympanum. 

 Loreal region concave ; canthus rostralis lightly curved ; fold 

 over tympaniim feebly developed. Exposed part of vomers 

 bearing the teeth not so prominent as in M. granulatus, with 

 large median space between them. Fingers well developed, their 

 tips expanded into discs about, or a fraction more than, double 

 the breadth of the penultimate joint ; on the first finger, which 

 is much shorter than the second, the disc is smaller than this. 

 Toes moderate, their tips exj^anded into discs which are much 

 smaller than those of the hand, being barely 4 their diametei'. 

 Toes I webbed. Inner metatarsal tubercle rather small, not 

 promiT'ient. 



Tibio-tarsal joint of adpressed leg reaches the nostril or just 

 short of it. Heels stronglj^ overlapping. Distance from snout to 

 vent 1| times as long as tibia, which is 5 times as long as broad. 



* Vide also (3). 



