74 



BULLETIISr 50, UNITED STATES NATIONAL MUSEUM. 



with gra^dsh brown, and white of under parts sometimes tinged with 

 .pale rusty or cinnamon. 



Adult WY?Z^^ -Length (skins), 110-127 (119.1); wing, 96-111 (102); 

 tail, 45-58 (49.7). forked for 4-12.5 (8.3); exposed culmen, 5..5-T (0.8); 

 width of bill at frontal antise, 4.8-6 (4.9); tarsus, 10-12 (10.8); middle 

 toe, 9-10 (9.4).« 



AdvJt female.— \j^\\%i\i (skins), 113-126 (119.8); wing, 95-108 (100.6); 

 tail, 44-52 (49.9), forked for 6-10 (8); exposed culmen, 6-7 (6.2); width 

 of bill at frontal antise, 5-6 (5.2); tarsus, 10-12 (11); middle toe, 8-10 

 (9.5).'^ 



Northern Hemisphere; in America breeding from arctic districts 

 southward to Georgia (St. Simons Island), Louisiana, Texas, Arizona 

 (Fort Lowell), and northern Mexico (Sabinas, State of Coahuila); in 

 winter migrating southward through Mexico, Central America, and 

 South America, as far as eastern Peru and Brazil, and to West Indies 

 (Cuba; Jamaica; Porto Rico). 



\Hirwnd6\ riparia Linn/eus, Syst. Nat., ed. 10, i, 1758, 192 (ex Fauna Suecica, 

 no. 247, etc.); ed. 12, i, 1766, 344. -Brunnich, Orn. Bor., 1764, 74.— Gmelin, 

 Syst. Nat., i, pt. 2, 1788, 1019.— Latham, Index Orn., i, 1790, 579. 



Hirundo riparia Wilson, Am. Orn., v, 1812, 46, pi. 38, fig. 4. — Vieillot, Enc. 

 Meth., ii, 1823, 517.— Pallas, Zoogr. Rosso-Asiat. , i, 1826, 535.— Swainson 

 and Richardson, Fauna Bor. -Am., ii, 1831, 333. — Nuttall, Man. Orn. U. S. 

 and Can., i, 1832, 607.— Audubon, Orn. Biog., iv, 1838, 584, pi. 385; Synop- 

 sis, 1839,36; Birds Am., oct. ed., i, 1840, 187, pi. 50.— Jardine, Contr. Orn., 

 1848, 82 (Bermudas, in autumn). — Hurdis, Jardine's Contr. Orn., 1850, 7 



« Seventeen specimens. 



^ Thirteen specimens. 



Specimens from separate geographic areas average, respectively, as follows: 



Depth 



Locality. 



of fork 



of 



tail. 



MALES. 



Eight adult males from eastern United 

 States 



Three adult males from Pacific coast dis- 

 trict 



Five adult males from Europe 



One adult male from Korea 



FEMALES. 



Seven adult females from eastern United 

 States 



Two adult females from Rocky Mountain 

 district 



Two adult females from Pacific coast dis 

 tnct 



Two adult males from Europe 



7.1 



7.5 

 10.1 

 11 



7.7 

 9 



I am unable to detect any constant difference in coloration according to locality. 



