Bangs — Rare or Not Well Known Costa Rican Birds. 31 



MEASUREMENTS. 



For comparison with tliese a series of Trogon melanocephalus melano- 

 cephalus Gould aflbrds the following measurements : 



Remarks. — Trogon melanocephalus illaetabilis is found in Costa Rica 

 only in the north\Yestern to north central parts of the country. Specimens 

 from western Nicaragua appear to be quite the same as those from Costa 

 Rica, and the form is distinginshed from true T. melanocephalus of the 

 eastern slopes of Central America from southern Mexico to eastern Nica- 

 ragua chiefly by its grayer head and chest, and by being a trifle larger. 

 In both subspecies young birds have grayer or jjaler heads and necks than 

 do adults. The young are easily told by the markings of the tail feathers 

 and wings, and should of course not be compared wdth adults. The young 

 of the two subspecies, however, when compared are nearly as difterent 

 one from the other as are the old birds. 



