New Hints from Yucatan. 157 



ash-color, with a smoky tinge on the lower part of the abdomen and on the 

 under tail-coverts ; bill and feet black. 



Length to end of spines 4 inches ; wing, 3.90 ; tail to end of spines, 1.G5; 

 length of spines, 0.25. 



Habitat, Silam, Yucatan. Collected try Geo. F. Gaumer. 

 Type in my col lection. 



Remarks. — This is a smaller species than my Chcetura Gau- 

 nieri (Annals, Vol. II, p. 245), but resembles it in general color- 

 ation, except in having the throat more ashy, and in being darker 

 on the abdomen and on the rump, with the tail blacker, and the 

 webs of the tail-feathers tapering at their ends, these being 

 rounded in C. Ganmeri. 



In my account of G. Gaumeri, I stated, that the spines of the 

 tail-feathers were worn off close to the webs, and that this fea- 

 ture was probably caused by the bird's inhabiting rocky cliffs. I 

 have now seen six specimens of this species, all precisely alike in 

 the worn character of the shafts of the tail-feathers. I am of 

 the opinion that the shafts do not extend much beyond the webs. 

 The tail-feathers at the end closely resemble in shape those of 

 Chcetura cinereicauda, and I judge that the shafts in perfect 

 condition are also similar, i. e., extending only a short distance 

 beyond the webs. 



It w 7 ill be seen by the subjoined communication from Mr. Gau- 

 mer, that the two species were obtained at different localities, 

 and at about the same season. He writes : "I would call your 

 attention particularly to the bird, numbered 107 (?); this speci- 

 men and another which I have, were taken at Silam in June ; 

 the spines are quite long and sharp, while those birds of the in- 

 terior (C. Gaumeri), taken both before and since, have the spines 

 very short and blunt." 



3. Engyptila Gaumeri. 



Front, as far as the middle of the crown, pure white ; hind part of the 

 crown and the occiput grayish-blue ; hind neck and upper part of back with 

 bright crimson reflections mixed with green on the lower part ; back, wings 

 and upper, tail-coverts light brownish-olive ; middle tail-feathers olive-brown, 

 the other tail-feathers black, rather narrowly white at their ends ; lesser and 

 middle wing-coverts of a light reddish-brown ; the primaries have their outer 

 webs reddish brown, of the same color as the wing-coverts, the outer edges 



