274 Xew Species of Birds from Yucatan. 



wing-coverts are colored like the hack ; the quill feathers are black and 

 have the margins of the inner webs of a brownish color ; the lores are 

 black ; the chin and throat are grayish-white ; the abdomen, sides and 

 under tail-coverts are light fuliginous, darker on the latter ; the bill and 

 feet are black. 



Length, 4.63 inches ; wing, 4.38; tail, 1.75; middle spine, 0.15 ; outer. 

 0.10. 



Habitat, Temax, Yucatan. Type in my collection. 



Remarks. — Differs from C. Gaumeri in being somewhat 

 larger and in having the quill-feathers much broader ; the upper 

 plumage is darker, the jump of C. Gaumeri is of a clear ash- 

 color ; the breast, abdomen and under tail-coverts are darker in 

 the new species, more fuliginous. 



Mr. Gaumer writes concerning it as follows": — 



"On the 12th of September, at 4 o'clock P. M., a flock of 

 about 150 swallows seemed to have recently arrived in Temax. 

 They were evidently strangers, as they went at once to hunt for 

 a suitable well (senote) in which to pass the night. They en- 

 tered several, and at last selected one in the suburbs of the 

 town, that was in daily use. They were very quiet and all en- 

 tered the well at 5.30 P. M. I put some boys to work tu catch 

 them, and thirty-two good specimens were caught; of these I 

 send you twenty tails and one entire bird. Next day they were 

 all gone; and the C. Gaumeri, which is resident, was abundant 

 as usual ; five were secured, but all had their spines shorter and 

 blunter, and all seemed to be at home, and not wearied as those 

 of the day before." 



As will be seen by Mr. Gaumer's account, the region usually 

 inhabited by this species is unknown, its appearance in Temax 

 being a transient one. 



The spines on the tail-feathers of all the specimens sent are 

 in good condition, whereas in nearly all of those of O. Gaumeri 

 received they are worn off. 



