174 DR. MALCOLM SMITH ON 



Dimensions. Total lenotb, B3 mm., head and liody 11. 

 A feature of the tadpole is the liigh, festooned upper crest, 

 which gives it a very handsome appearance. 



TlIF. TADPOLE OF OxYdLOSSIS LAKVIS MARTENSI. 



Similar to 0. limn except : — 



Upper caudal membrane, low. hardl}- any deeper than the lower, 

 slightly convex. 



Upper lip shorter, so that a considerable portion of the lower lip 

 can hd seen when the head is viewed from above. 



Toes webbed as in the adult. 



Size much smaller; total length, 23 mm., head and body 8.5 mm. 



Colour ( in life ) Olive above, fine)}' speckled and streaked with 

 jjlack. A dark band through the eye, and a light golden one beneath, 

 along each side of the head. Tail with light and dark variegations. 

 Below thiclcly speckled with black and white. 



The tadpole of 0. laeris from the Celebes as described by Mr. 

 Boulenger is 51 mm. in total length, but in otiier respects appears to 

 agree very closely, with 0. I. martcnsi. 



Both the tadpoles just described may be found in Bangkok 

 throughout the greater part of the rainy season. In their habits they 

 are much alike. Both are sluggish, and hardly ever move about, re- 

 maining quietly at the bottom of any ditch or pool they happen to live 

 in. Unlike other tadpoles that 1 know, they have a habit of sprawling 

 out their hind-limbs in an ungainly manner, and of using them also as 

 a means of locomotion, ))referriiig to crawl slowly about by their aid, 

 rather than use their tails. They are carnivorous feeders, preying on 

 mosquito larvae, other small tadpoles etc. 



As a genus, these tadpoles seem very distinct, the long, pointed 

 snout, and the small, terminal moutli, with large beak but no teeth, 

 serving to distinguish them at once from tadjioles with the Kanid or 

 Eng3'stomatid type of mouth. 



The embrace of the parent I'rog ( 1 have only seem that of 0. 

 liiiin), is axillary. 



Both species of frog are widely distributed throughout Slain. 

 Tn the southern ]iortion of the Jfalay Peninsula thoy ajijiear to be 



.lOUHN. N.^T. I118T. .SOC. SIAM. 



