Species of the Subfamily Diglossinse, 215 



Atra unicolor : tectricibus alarum minoribus cserulescenti- 

 canis, subalaribus partim cinereis : long, tota 5-8, alae 3"0, 

 caudae 2*5, rostri a rictu 0*75. 



Hab. Columbia and Ecuador. 



Mus. P. L. S. et S.-G. 



10. Dl.GLOSSA HUMERALIS. 



Agi'ilorhinus humeralis, Fraser, P. Z. S. 1840^ p. 22. 



Diglossa humeralis, Cab. Mus, Hein. p. 27 (note) ; Reich. 

 Handb. p. 231, t. dlii. f. 3754 ; Cassin, Pr. Ac. Phil. p. 275 ; 

 Wyatt, Ibis, 1871, p. 324 ; Scl. et Salv. Nomencl. p. 15 ; Scl. 

 Cat. A. B. p. 49. 



Nigra, uropygio cineraceo : tectricibus alarum minoribus canis : 

 subalaribus nigris : long, tota 5 '7, alae 2' 7, caudse 2-4. 



Hab. Columbia and Ecuador. 



Mus. P. L. S. et S.-G. 



After much deliberation I had almost come to the conclusion 

 that the only reasonable plan was to unite the species com- 

 monly called D. lafresnayi and D. humeralis under one name. 

 They occur in the same countries, and are usually stated to 

 differ only in size — a very uncertain character in this genus. 

 Moreover, as will be seen by the subjoined table of measure- 

 ments, there is really not much difference in this respect 

 when a series is examined. But there are certainly to be 

 recognized the slight differences pointed out in the diagnosis, 

 viz. that in D. lafresnayi the bend of the wing is of a much 

 brighter bluish tinge, the rump is quite black, like the back, 

 and the under wing-coverts are more or less ashy. I propose, 

 therefore, for the present to leave the two so-called species 

 apart, though it is quite possible D. humeralis may be the 

 female. 



Mr. Wyatt obtained D. humeralis at a height of 9000 feet 

 in the Andes of Ocana. It is also common in " Bogota " and 

 " Quito " collections. 



The subjoined Table gives the dimensions of ten skins of 

 these two birds in my own collection and that of Messrs. 

 Salvin and Godraan. 



q2 



