THE FROGS OF THE GENUS OXYGLOSSIS. 173 



on the other haml, as Just mentioned, the}' may attain a length of 42 

 mm., and tlie general build is in proportion 



With regard to the toes, the web in specimens from the Penin- 

 sula and Siam is aKva3-s emarginate, and never full as appears to be 

 usual with those from the Archipelago. 



In colouration there appears to be no difference, but individuals 

 from the Peninsula and Siam maj- have a large orange or yellow patch 

 behind the eyes. 



The tadpole of this frog in Siam, is less than half the size of 

 that described by -Mr. Boulenger from the Celebes. 



For these reasons, therefore, it would be convenient to separate 

 this species into two races, a large or southern one itihabiting the 

 islands of the Malayan Archii)elago, and a small or northern one, ranging 

 through the Malay Peninsula and Siam, into Burma and Indo-Ciiina. 

 To this latter i-ace the name Oxifjlossis laevis martcnsi maj' be applied. 



The tadpole of Oxygloskis lima. 



Head and body, lengtli twice, or nearly twice its breadth, 

 snout long, obtusely pointed. Nostrils equidistant between the eyes 

 and the tip of the snout. Eyes towards the upper surface of 

 the head, looking outwards and upwanls, twice as far apart as the 

 nostrils. Spiraculum sinistral, directed straight backwards, nearer 

 the vent than t he eye, long and prominent in life. Anal tube very 

 short, median. Mouth small, terminal, without papillae; lower lip 

 vertically horse-shoe shaped, upper lip, a small rounded flap ; no 

 teeth ; beak entirely black, lower mandible deeply semilunar in shape. 

 The lower lip, which occnpit-s tlie greater part of the mouth, itself 

 projects from a sheath of skin, which is formed by. and is part of, the 

 skin of the rest of the body. 



Tail sharplj'^ pointed, very high at its commencement where it 

 rises almost abruptly from the base of the tail, diminishing gradually 

 as it passes backwards ; at its highest point about four times as deep as 

 the lower crest, which is very shallow. Toes webbed as in the adult. 



Colour (in life). Light olive above, with darker markings ; a 

 dark streak through the eye passing backwards, and dark patches at 

 the base of the tail. Caudal membranes handsomely veined and 

 mai'bled with shades of brown. Below, white. 



VOL. n. DEC. 1010. 



