144 bulletin: museum of compakative zoology. 



and from the fact that I frequently heard the song in a few definite localities, 

 I judged that the birds might be nesting. They were heard singing as early 

 as March 6, and were still in song when I left, early in April. As Chapman 

 says, the song suggests that of the Field Sparrow. It differs, however, not only 

 in quality, but in keeping about on the same note, and in decreasing but little 

 in volume, though it becomes much more rapid towards the end. It may be 



represented by the syllables : chew chev) cheio cliew — che-che-che-che- 



che-che-che. When one is close to the singer, a sharp preliminary note may 



sometimes be heard, thus : chip, cheio cheiv etc. There appears to be 



considerable variation in the song of the same individual. The song is usually 

 heard in the early part of the forenoon. 



128. Pooecetes gramineus gramineus (Gmelin). 



Vesper Sparrow. 



One specimen : 9> April 4, 1904. 



So far as I can learn, the Vesper Sparrow has not previously been reported 

 from Yucatan ; in fact, this appears to be the extreme southern record for this 

 subspecies, since Salvin and Godman (Biol. Centr.-Amer., 1, p. 383) state 

 that the bird which occurs in Mexico is the western subspecies, P. g. confinis. 

 Ridgway (Bull. 50, U. S. Nat. Mus., 1901, 1, p. 183) says that it goes " south 

 in winter to Gulf coast (Florida to eastern Texas)." This record is the more 

 remarkable for the lateness in the season when the specimen was taken, the 

 species usually being by that time well north on its spring migration. 



The identification of this bird was kindly verified by Mr. Ridgway. 



ADDITIONAL LIST OF BIRDS FROM YUCATAN WHICH 



HAVE NOT AS YET BEEN REPORTED FROM 



CHICHEN-ITZA. 



This list, included for the sake of making complete the report on the 

 birds obtained, contains merely notes on a few species obtained or 

 observed in other parts of the peninsula, and not included in the fore- 

 going list. 



1. Tinamus robustus Sclater. 



Tinamou. 



A native proprietor of a chocolate shop in Progreso had a female bird of 

 this species which was so tame that it went about under the tables picking up 

 crumbs from the floor. It could usually be heard uttering a peculiar low 

 whistle, which was capable, however, of being heard at a considerable distance. 

 Two eggs laid by this bird, which I secured from the owner, are green-blue 

 (robin 's-egg blue) in color, and have a hard, glossy surface. They are sphe- 

 roidal in shape and measure respectively 60.6 mm. X 47.3 mm., and 60 mm. X 



