328 J. S. BUDGETT. 



The skin glands are strongly developed, emitting a very 

 sticky white slime. 



XIX. Hyla nana, Boul. 



This small frog was abundant in the swamps, usually found 

 by moonlight sitting on the broad-leaved plants of the swamp, 

 and calling with a rather highly pitched scraping note. 



The upper surfaces, as in H. spegazini, are light straw- 

 colour by day, but brown by nigbt. Flanks and underneath 

 pigmentless. 



XX. Hyla phrynoderma, Boul. 



A light golden colour, shaded with darker above. The discs 

 fairly strongly dilated. The skin is warty and extremely 

 delicate, and it is not easy to catch one uninjured. 



They are not common, but make themselves known by their 

 constant call, which is just like the quacking of a duck. All 

 the specimens I obtained were about the palm fencing and 

 sheds. 



XXI. Hyla nasica. Cope. 



This is the most common Hyla in the Chaco. It is found 

 everywhere, usually upon palm or palm fencing, where it is 

 most inconspicuous. 



Its call and habits are much like H. phrynoderma; the 

 note is, however, somewhat lower. The colours are chiefly 

 olive-green and brown, but the markings are variable. It is 

 of more slender build than H. phrynoderma, the body being 

 longer in proportion to the width of the head. 



XXII. Ceratophrys ornata, Bell. 



I obtained some half a dozen specimens of this curious and 

 well-known South American frog, commonly known as the 

 " Escuerso." 



Its ferociousness is its most striking characteristic, If it is 



