326 Zoological Society : — 



of about thirty-five small golden-yellow spots runs along the back to 

 the tail, where they become more irregular; each spot has a black, 

 edge posteriorly. The upper surface of the head is uniform dull 

 green, bordered on each side by a black stripe proceeding from the 

 eye to the side of the occiput. Length of the head 1 inch 4 lines ; 

 of the trunk 2 feet 3 inches ; of the tail 6 inches. 



A single specimen only of this new species was preserved for me 

 at Cohan by Mr, Owen while I was away in the mountains of Lan- 

 quin. It had been brought to him by an Indian. 



Hyla holochlora. 



Vomerine teeth in two slightly oblique series, beginning from the 

 anterior edge of the nostrils and converging posteriorly, more or less 

 interrupted in the middle. Width of the tympanum two-thirds of 

 that of the eye. Skin smooth. Disks of the toes very broad, as 

 large as the tympanum ; the three outer fingers almost entirely 

 webbed. Uniform grass-green above, yellow below. 



Hab. Cohan in Guatemala. 



Habit that of H. arhorea. Head broad, with flat crown, rather 

 short muzzle, and rounded canthus rostralis. Eye of moderate size, 

 rather prominent. Tympanum two-thirds the width of the eye, with 

 a small fold behind it. The legs of moderate size, with very large 

 disks, and with the tubercles on the lower part of the feet very well 

 developed. Toes entirely, and the three outer fingers almost entirely, 

 webbed. No fold across the chest. Skin without any appendages. 

 Tongue with a conspicuous notch posteriorly. Male with a single 

 subgular sac. Sacral vertebra considerably dilated. Upper parts 

 uniform grass-green, except the upper arms and thighs, which are 

 colourless. Lower parts yellow. Length of the body of an adult 

 female 3 inches ; length of the fore leg 2 inches ; length of the hind 

 leg 4^ inches. 



Of this Tree Frog I obtained three examples at Cohan, all of which 

 were caught by the Indians. It was the only species I met with. 



Note on the Bal^niceps rex. By A. D. Bartlett. 



The question of the affinities of the BalcBiiiceps having been dis- 

 cussed by so many able ornithologists, it may be interesting to know 

 that this bird does not possess the remarkable patches of down found 

 on each side of the breast in all the Herons and Bitterns. 



Having had the opportunity of ascertaining this fact by an exami- 

 nation of the living bird, now in the Society's Gardens, I am en- 

 abled to say that these patches (which are of a singular dense and 

 close structure, and are found beneath the feathers on each side of 

 the front and fore part of the pectoral muscles) do not exist in the 

 Balceniceps. The absence of this itructure may, I think, assist in 

 indicating the true affinities of this bird, as pointed out by Dr. Rein- 

 hardt in his communication to the Society on this subject*. 



* See antea, p. 144. 



