74 



BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



with grayisk brown, and white of under parts sometimes tinged with 

 pale rusty or cinnamon. 



Adult OT.afe.— Length (skins), 110-127 (119.1); wing, 96-111 (102); 

 tail, 45-58 (49.7), forked for 4-12.5 (8.3); exposed culmen, 6.5-7 (6.3); 

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

 toe, 9-10 (9.4).- 



Adult female.— Length, (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). 



IHirundo] riparia Likn^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. 

 M^th., ii, 1823, 517.— Pallas, Zoogr. Rosso- Asiat. , i, 1826, 535.— Swainson 

 and EicHARDsoN, 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.— Jaedine, Contr. Orn., 

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



« Seventeen specimens. 



6 Thirteen specimens. 



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



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



