Parrot- Like Birds. 113 



than in the sexed male, but whether this is a constant character 

 I cannot say. 



Spix's Macaw (Cyanopsittacus spixi). 



Only a female is sexed, but the probable male has a broader and 

 slightly larger beak, with a longer terminal hook ; it is also a larger 

 bird. 



Blue-and- Yellow Macaw (Ara ararauna). 



The female is slightly smaller than the male ; has a shorter, 

 narrower beak, with shorter terminal hook. 



Red-and-Blue Macaw (Ara macao). 



Only the male is sexed. The probable female is smaller, with 

 shorter but equally broad beak, and shorter terminal hook. 



Red-and-Yellow Macaw (Ara chloroptera). 



The sexes agree in size, but the male has a longer beak, narrower 

 when viewed in profile ; the culmen less arched, the terminal hook 

 variable in length, perhaps owing to wearing down through age. 



Military Macaw (Ara militaris). 



The male is slightly larger than the female, and has a distinctly 

 longer beak, with less arched culmen; in young males the terminal 

 hook is probably longer than in young females, but with advanced 

 age it gets much worn down. 



Severe Macaw (Ara severa). 



Only the male is sexed in the Museum ; the probable female has 

 a shorter beak, and more arched culmen. 



Illiger's Macaw (Ara maracana). 



The male is slightly the larger bird, and has a rather longer beak ; 

 but the sexual differences are less strongly defined than usual. 



Noble Macaw (Ara nobiiis). 



The male is larger than the female, his beak is rather longer, and 

 a trifle fuller towards the terminal hook. As with the preceding 

 species, the sexual differences are not so well marked as usual. 



Hahn's Macaw (Ara hahni). 



In this species the skull and beak of the male are narrower than 

 in the female ; the beak also is longer, and though narrower at base, 

 comparatively fuller before the commencement of the terminal hook. 



We now come to the true Conures, of which Mr Seth-Smith 

 says : " The sexes are, outwardly, alike in the Conures, although 

 the males are slightly larger than the females" (Parrakeets, p. 27). 

 These birds are numerous in species, and consequently the present 

 chapter will be longer than usual. 



H 



