Mr. G. A. Boulenger on new Batrachians. 345 



modus Vivendi between these two creatures ; the name of 

 symbiosis has been very justly given to this modus vivendi 

 in those cases in which the two organisms draw a reciprocal 

 profit from their association, and it seems to me desirable even 

 to extend it to the extreme cases that we have been investi- 

 gating. 



XLII. — On new Batrachians from Malacca. 

 By G. A. Boulenger. 



[Plate X.] 



Mr. D. F. a. Hervey has presented to the Natural History 

 Museum a collection of Reptiles and Batrachians obtained 

 within a radius of fifty miles from the town of Malacca, which 

 was exhibited in the Straits Settlements Court at the Colonial 

 and Indian Exhibition. The lizards, of which two species 

 were new, have been mentioned in the Appendix to the British 

 Museum Catalogue of Lizards. Of the Batrachians two 

 species are new to the Malay peninsula, viz. Rana laticepSj 

 Bigr., and Microhyla achatina^ Boie, and four are new to 

 science and described below. 



Rana lahialis. (PI. X. fig. 1.) 



Allied to R. chalconota. Vomerine teeth in two oblique 

 series between the posterior borders of the choanse. Head 

 considerably longer than broad, much depressed ; snout long, 

 acuminate, projecting beyond the lip ; nostril twice as distant 

 from the eye as from the end of the snout ; loreal region 

 deeply concave; tlie diameter of the eye equals its distance 

 from the nostril ; interorbital space a little broader than the 

 upper eyelid ; tympanum very distinct, usually about three 

 fourths the diameter of the eye, sometimes quite as large as 

 the eye. Fingers rather slender, first not extending as far as 

 second ; toes moderate, three-fourths webbed ; tips of fingers 

 dilated into large disks, the diameter of which equals about 

 half that of the tympanum ; tips of toes dilated into small 

 disks ; subarticular tubercles moderately developed ; two small 

 metatarsal tubercles, outer rather i)idistinct. Hind limb slen- 

 der; the tibio-tarsal articulation reaches the tip of tlie snout 

 or a little beyond. Upper surfaces finely granulate ; a glan- 

 dular lateral fold, distinct only anteriorly ; lower surfaces 

 smooth. Brown or purple above, darker on the sides, with 

 rather indistinct darker spots ; tympanum chcstnut-browu • a 



