432 Mr. E. Hartert — Various 



already quite correctly stated by Boucard iu Gen. Humra. 

 B. p. 57. 



Genus Thalurania. 



In Nov. Zool. iv. p. 150, I mentioned that the Tring 

 Museum had received some skins oiThality^ania balzani, Simon, 

 collected by Mr. Arthur Maxwell Stuart on the Beni River 

 in Eastern Bolivia. They are five adult males, two females, 

 and one young male. The two females, the young male, and 

 two adult males have the under tail-coverts pure white, while 

 the other three adult males have white under tail-coverts 

 with dark brown centres. All these were shot at Salinas : 

 one at Reyes^ in low country on the Beni River ; while at 

 San Augustin, 3500 feet high, Mr. Stuart collected three 

 adult males, two young inales, and one female of T. jehkii. 

 In all the males of that species the under tail-coverts are 

 deep steel-blue, nearly black, with more or less conspicuous 

 whitish edges towards the base of the longest feathers ; in 

 the female they are dark ashy with metallic green centres. 

 The bill of T. balzani measures from 18-19 mm., the wing 

 53-54 mm., the tail (in the males) 35-38 mm. ; while in the 

 males of T.jelskii from San Augustin the bill is 18-18-5 mm._, 

 the wing 56-58 mm., the tail 40-43 mm, Other differences 

 between these two birds T do not see. 



Genus Eriocnemis. 



In Nov. Zool. i. p. 59 (1894), E. & CI. Hartert described 

 as a new species an Eriocnemis evelina from the Rio Pastassa 

 in East Ecuador. When doing so they compared it with 

 E. gudini, and attached special value to the red base of the 

 mandible. However, a closer study, especially of young 

 individuals of E. vestita (kindly lent me by Count Berlepsch) 

 and of E. smaragdinipectus, shows that the bird from the 

 Rio Pastassa belongs to this group. In fact, it has nothing 

 to do with E. godini, which is larger and does not show the 

 bright glittering upper tail-coverts. The red base of the 

 mandible is no doubt a sign of youth, and so is the greenish 

 shade on the under tail-coverts. Only the very strong 



