BIRDS OF NOBTH AND MIDDLE AMERICA. 



59 



tail, 43-52 (47.6); exposed culmen, 6-8 (6.7); width of bill at frontal 

 antise, 5-6 (6.1); tarsus, 11-12 (11.3); middle toe, 9-11 (9.9).« 



Temperate North America, Mexico, and Central America as far as 

 Costa Rica; breeding north to Connecticut (Stamford, Norwich, New 

 London, near Gales Ferry, etc.), central Massachusetts (Berkshire 

 County), southeastern New York (Orange, Greene, and Ulster counties, 

 Shelter Island), Ontario (Hamilton), northern Indiana (Carroll and 

 Wabash counties), southern Wisconsin (Racine), southern Minnesota, 

 North Dakota, Montana, and British Columbia (Vancouver Island), 

 south to Georgia, Louisiana, Texas, etc., and over greater part of 

 Mexico, as far as State of Vera Cruz (Jalapa, etc.*); casual northward 

 to northern Michigan (Mackinac Island) and Manitoba (Winnipeg); in 

 winter southward through Central America to Costa Rica, occasion- 

 ally wintering on coast of South Carolina. 



Hirundo serripennis Audubon, Orn. Biog., iv, 1838, 593 (Charleston, South Caro- 

 lina; type in coll. U. S. Nat. Mus. ); Synopsis, 1839, 37; Birds Am., oct. ed., 

 i, 1840, 193, pi. 51.— Van Fleet, Bull. Nutt. Orn. Club, i, 1876, 9 (nesting 

 habits, etc.). 



ISirundo'] serripennis Boie, Isis, 1844, 170. 



\_Cotyle] serripennis Bonapakte, Consp. Av., i, 1850, 342. 



Cotyle serripennis Cassin, Cat. Hirund. Mus. Philad. Acad., 1853, 11 ; Illustr. 

 Birds Cal., Tex., etc., 1855, 247.— Sclater, Proc. Zool. Soc. Lend., 1856, 285 

 (Cordova, Vera Cruz); Cat. Am. Birds, 1862, 41 (Orizaba, Vera Cruz ).—Nbw- 

 EEREY, Rep. Pacific R. R. Surv., vi, 1857, 79 (California and n. to Columbia 

 R.).— Brewer, isT. Am. OoL, 1857, 106, pi. 4, fig. 50.— Baird, Rep. Pacific 



« Twenty-six specimens. 



Specimens from different geographic areas average respectively as follows: 



I am not able to discover any difference of coloration in the above series, but many 

 young birds from the eastern United States appear to be less strongly washed with 

 cinnamon, both above and below (sometimes with none on under parts), and the 

 margins to tertials much paler cinnamomeous. The difference is by no means con- 

 stant, however, the variation being considerable in either series. 



b Breeding records from Guatemala and Costa Rica doubtless pertain to S. salvini, 

 which see (p. 62). 



