bangs: birds from the cayman islands. 311 



t Centurus caymanensis Cory. 



Nine specimens, both sexes, all adult, Grand Cayman, April, May, 

 and June. 



This strongly characterized island species, is one of the commoner 

 birds of Grand Cayman to which island it is confined. 



Tyrannidae. 

 Tyrannus dominicensis dominicensis (Gmel.). 



Four specimens, both sexes, all adult, Grand Cayman and Cayman 

 Brae, April and June. 



TOLMARCHUS CAYMANENSIS (NicoU). 



Twenty specimens, both sexes, young and adult, Grand Cayman, 

 Little Cayman, and Cayman Brae, April, May, June, and July. 



This is a well-marked form peculiar to the Caymans, where, I be- 

 lieve, it does not differ either in color or size in the three islands of the 

 group. In fresh spring plumage (April specimens from Grand Cay- 

 man) the back is distinctly olivaceous, as compared with the gray 

 back in the Cuban form, T. caudifasciatiLS (D'Orbigny), in similar 

 plumage. In birds killed by May 25 and from then on through the 

 summer, the color of the back, by fading and wear, has changed to a 

 dirty grayish, quite the same as in Cuban skins in the same condition 

 of feather. In this plumage the Cayman bird can only be recognized 

 by its much duller, browner head, less contrasted with the gray of the 

 back — the head of the Cuban bird in worn plumage being very black 

 and sharply contrasted against the color of the back. The Cayman 

 bird also has a longer and more slender bill, this character being well 

 marked as an average one, but unfortunately failing in the case of 

 certain individuals. All the adults from Little Cayman and Cayman 

 Brae, except one, are in the worn and faded midsummer plumage 

 just referred to; the one exception is M. C. Z. 68248 Cayman Brae, 

 June 29, which, though taken on a date earlier than some others that 

 had not changed, has almost completed the postnuptial moult and 

 has again an olivaceous back. The color of the back in this skin is 

 quite the same as in the April specimens from Grand Cayman, while 

 the more faded Grand Cayman individuals killed May 25 are like the 



