Parrot- Like Birds. 115 



Mexican Conure (Conurus holochlorus). 



In this species the beak of the male is narrower than that of the 

 female. 



Aztec Conure {Conurus aztec). 



The beak of the male is slightly narrower at the base than that 

 of the female, and the terminal hook is more slender. 



Cactus Conure (Conurus cactorum). 

 The male is decidedly the larger bird, and has the longer beak. 



Brown-throated Conure (Conurus ceruginosus). 

 . According to sexed specimens in the Natural History Museum, 

 the male has a broader and shorter beak than the female. If the 

 sexing of the various species of Conures is correct in every instance, 

 and there is no reason why one should suppose that it is not, the 

 structural peculiarities of the sexes seem to follow no definite rule 

 in this group, the male sometimes having a long and narrow beak such 

 as one would expect to find in that sex, and sometimes a broad and 

 short beak such as one would expect to be "characteristic of a female 

 bird. It is, however, possible that some males are more active in 

 the defence of their nests than others, and their weapons have been 

 modified in consequence. In the sexed males of this species the 

 cheeks and sides of throat are washed with greyish vinaceous, but 

 the colouring of the species is variable. 



St Thomas' Conure (Conurus pertinax). 

 Of this species I found no sexed specimens in the Museum; but 

 what I take to be females have shorter and broader beaks than the 

 others. 



Golden-crowned Conure (Conurus aureus). 

 The female has a broader and shorter beak than the male. 



Petz's Conure (Conurus oanicularis). 



The male has a much heavier and more curved beak than the 

 female. 



Carolina Conure (Conuropsis carolinensis). 



In the male the beak is broader and very slightly longer than in 

 the female. 



Smaller Patagonian Conure (Cyanolyseus patagonus). 



The female is smaller than the male ; the beak is smaller, shorter 

 but broader at base. ' 



Larger Patagonian Conure (Cyanolyseus byroni). 

 The male in the Museum sexed specimens is smaller than the 

 female ; the beak is longer, straighter, and more gradually tapered, 

 with more slender terminal hook. 



