NOTES ON BATRAOHIANS OF THE PARAGUAYAN CHACO. 327 



Phyllomedusa ; indeed, Professor Mitsukiiri^ who lias seen 

 them both, assures me that this is so. 



To a paper by Gasser published in the * Sitz. d. Kon. Ak. 

 Marburg/ 1882, upon the development of the midwife toad, 

 Alytes obstetricansjl have not yet been able to get access, 

 but I feel quite prepared to find that it exhibits the same 

 features that characterise the development of Phyllo- 

 medusa hypochondrialis. 



XVI. Phyllomedusa Sauvagii, Boul. 



This handsome tree-frog was brought to me in the Chaco, 

 but I am not able to state anything about its habits. 



XVII. Hyla spegazinii, Boul. 



This fine Hyla was fairly common ; I often caught or saw 

 young specimens swimming from stem to stem of the Papyrus 

 grass as we travelled through the reed-choked swamps. The 

 full-grown specimens, however, were always taken either from 

 palm tops just felled or from the trees overhead. 



When caught in the water by daylight they were a bright 

 light yellow, but at night they turned to a darker shade, and 

 became marbled on the upper surface with brown markings. 

 The full-grown specimens did not in this way become dark at 

 night. 



The largest specimens taken measured 80 mm. The eggs in 

 the cloaca appear to be quite like those of Rana in size and 

 colour, and are probably laid and reared in the same way. 



One full-grown specimen I obtained in Central Paraguay on 

 the Tibicuari, the rest in the Paraguayan Chaco. 



XVIII. Hyla venulosa, Laur. 



In life the markings are olive-green or grey upon a whitish 

 ground. When taken from amongst foliage the whitish 

 ground colour is suffused with green. It is a powerful and 

 energetic frog, the large toe-discs having a tenacious sucking 

 power. 



