THE GENUS CHORDEILES SWAINSON OBERHOLSEE. 



77 



the present race, and represents the breeding form of this locality, 

 though a female from the same locality and taken on the same date 

 appears to be a belated migrant Chordeiles virginianus virginianus. 

 Birds from Kaleigh, North Carolina, of dates from August 5 to 

 August 10, are decidedly nearer the Florida race than to Chordeiles 

 virginianus virginianus^ as the accompanying measurements show. 

 A table of comparative average measurements of specimens from 

 various parts of the range of Chordeiles virginianus chapmani^ from 

 which may be seen any local differences in size, is here appended : 



I>ocalUies. 



Middle 

 toe. 



Fourteen males, from Florida 



Three males, from Alabama 



Two males, from Texas 



One male, from Louisiana 



One male, from southern Illinois 



Two males, from North Carolina 



Ten females, from Florida 



Three females, from southern Alabama 



One female, from Texas 



One female, from Louisiana 



One female, from Arkansas 



Two females, from North Carolina 



mm. 

 14.2 

 15 



15.3 

 15 



14.5 

 14.3 



14.4 



15.5 



15 



15.8 



16 



15.6 



The present race winters in Argentina, and its route of migration 

 lies, so far as the present material indicates, across the Gulf of 

 Mexico, through southeastern Mexico, Central America, and South 

 America. Possibly some individuals follow the coast of eastern 

 Mexico, as there is a specimen from Brownsville, in the extreme 

 southern corner of Texas, taken on March 15. There is, however, not 

 a record from any of the islands of the West Indies, but we have 

 examined a specimen taken at sea off the coast of Colombia. It 

 lingers in Central America, at least sometimes, until about the 1st 

 of June, for M. A. Carriker obtained it at Miravalles, Costa Rica, 

 on May 27, 1906.^ It rears apparently but one brood, though we have 

 records of eggs from April 24 to June 17. 



Specimens examined. — The specimens of the present form ex- 

 amined number 107, from the localities in the list below : 



Alabama. — Dauphine Island (May 18, 1911); Bayou La Batre 

 (Aug. 2, 1911; July 25, 1911) ; Mobile Bay (Apr. 19, 1892) ; Abbe- 

 ville (June 9, 1911); Petit Bois Island (July 28, 1911; Aug. 30, 

 1911) ; 5 miles west of Greensboro (June 26, 1890) ; Wilsonville 

 (June). 



1 The label of this specimen reads June 27, 1906, which is evidently a lapsus for May 

 27, since Mr. Carriker records specimens of Chordeiles virginianus from this locality on 

 May 24 and 25, 1906 (Ann. Carnegie Mus., vol. 6, 1910, p. 501), and this subspecies does 

 not breed south of the United States. 



