of correspondence in the variations of plumage of the sexes of these 

 two birds ; the male and female being in the one case extremely 

 alike, and in the other very diiFerent. 



The black-capped Calliste vras first described by the Baron F. de 

 Lafresnaye in the 'Revue Zoologique' for 1843, as then lately received 

 with other novelties from Bogota. It appears to extend its range 

 throughout the mountain-valleys of New Grenada and into the neigh- 

 bouring republic of Venezuela, specimens having been procured by 

 the late Mr. Dyson in the vicinity of Caraccas. There are examples 

 in the Derby Museum at Liverpool, collected, I believe by Delattre, 

 near Popayan, which is its farthest range in a westerly direction 

 which has come under my notice. 



In the summer of 1854 I had the pleasure of inspecting the beau- 

 tiful collection of birds belonging to Ilerr Oberammtman Ferdinand 

 Heine of Halberstadt, which is so well known from the publication 

 of Dr. Cabanis' catalogue of it under the title of " Museum Heinea- 

 num." I had no hesitation in deciding that Pi-ocnias heinei, of 

 which I then examined the type, is an immature bird of this species. 



