172 



ON THE FROGS OF THE GENUS OXYGLOSSIS. 



By Malcolm. A. Smith, ji. k. c. s., l. h. c. r. 

 With a Plate. 



In the genus Oxi/r/lossls, tliree species have been iiichided, 

 nameljr : — 0. linia (Gravenh.), 0. laecis Gluithei', and a tliird form, 

 doubtfully distinct from the latter, and described by I'eters from 

 specimens obtained in Bangkok, under the name of" 0. martensi. ^ 

 This latter was separated from laecis cm three points : — the webs of 

 the toes deeply emarginate, a rather indistinct metatarsal tubercle, 

 and warts on the back and limbs. None of these points, however, are 

 of specific value. 



Writing of 0. laecis when describing the tadpole, Mr. Boulenger 

 remarked. - " Adult and larval specimens were collected by llr. Everett 

 in Southern Celebes, at an altitude of some 2,000 feet. The largest 

 specimen measures 42 mm. from snout to vent. The toes may be 

 fully webbed, with rectilinear membrane, or the webs may be deeply 

 emarginate, as described by Peters in 0. martensi from Siam, which I 

 am now very much inclined to think is based on an individual variation 

 of 0. lacvis." 



In 0. laevis also there may be warts on the skin, wliile 0. vuirtensi 

 may have the skin smooth. 



1 have alwaj's been struck, however, when examining tliese frogs 

 in Siam, by the difference in size which exists between them and in those 

 recorded from the Archipelago. Through the kindness of the 

 authorities of the Selangor Museum, Kuala Lunipor, and The Raffles 

 Museum, Singapore, T have recently been able to examine the specimens 

 in their collection, and to compare those from the Malay Peninsula 

 and Archipelago, with my own large series from Siam. 



Siamese specimens seldom exceed 28 mm. in length, and those 

 that I have seen from tlie Peninsula ( Nakon Sitamarat, Singgora, 

 Patani, Jalor, Perak), have not been any larger. In the Archipelago 



1. Moil. Berl. Ac, 18G7, p. 29. 



2. I'.oulcngor, P. Z. S. t«!t7, p. 228. 



JOUKN. KAT. IJIST. SOC. SIAM. 



