340 Mr. G. A. Boulenger on 



Mr. Hutchinson has bred both males and females from both 

 forms, which appear to be equally common and which retain 

 their respective types of coloration from the first moult. The 

 question moreover is complicated by the occurrence of a 

 similar dimorphism in the pupal stage, which, however, 

 appears to be quite independent of the larval coloration. I 

 have not seen the green form, which is the normal one, but 

 it has been described by Mr. Trimen (from a single example), 

 who gives the colour as " greenish grey, antennse-cases pale 

 yellowish." Mr. Hutchinson tells me that, with two excep- 

 tions, his larvffi, amounting to about fifty in all and com- 

 prising about equal quantities of both forms, all assumed a 

 clear green colouring, though some of them showed a tendency 

 to fuscous clouding. The two exceptions were coloured as 

 follows : — Head, thorax, and wing-covers deep velvety 

 black ; a broad sinuate stripe along margin of latter and a 

 large pear-shaped patch on posterior slope of the thoracic 

 ridge dull creamy ; the whole of abdomen brownish pink. 

 Of these two pupae one was green in the larval stage and the 

 other black. Only one of them emerged, which proved to be 

 a perfectly normal wet-season female. It is perhaps worth 

 noting that in the specimens bred by Mr. Hutchinson the 

 females stood to tiie males in the proportion of three to one, 

 though, speaking from memory, I should say that the males 

 are the more plentiful in the field. 



Estcourt, Natal, 

 August 'IS, 1896. 



LI. — Descriptions of new Batrachians collected bi/ Mr. G. F. 

 Underwood in Costa Rica. Bj G. A. BoULENGER, F.R.S. 



Hylodes Under woodi. 



Tongue oval, entire. Vomerine teeth in two oblique 

 groups behind the choanse. Snout obtusely pointed, slightly 

 projecting beyond the mouth, as long as the diameter of tlie 

 orbit ; canthus rostralis obtuse ; loreal region concave ; nostril 

 much nearer the tip of the snout than the eye ; interorbital 

 space broader than the upper eyelid ; tympanum very distinct, 

 nearly as large as the eye. Fingers and toes slender, quite 

 free, with very small disks and strong subarticular tubercles ; 

 first finger not extending beyond second ; two prominent 

 metatarsal tubercles, inner oval, outer round. Tibiotarsal 

 articulation reaching a little beyond the tip of the snout. 

 ISkin of upper parts rough with small tubercles, some of 



