ORDER PASSERES. 293 
GENUS IRIDOPROCNE Cougs. 
Iridoprocne Cours, Birds Colo. Valley, 1878, 412. Type, by orig. desig., 
Hirundo bicolor VirrLuor. 
Iridoprécne bicolor (ViEILLoT). Tree Swallow. [614.] 
Hirundo bicolor Vimmiuot, Ois. Amer. Sept., I, 1807 (1808), 61, pl. 31. 
(Middle eastern United States.) 
Rance.— North America. Breeds in Canadian, Transition, and 
Upper Austrai zones from northwestern Alaska, southern and western 
Mackenzie, southern Keewatin, and northern Ungava to southern 
California, Colorado, Kansas, Missouri, and Virginia; winters from 
central California, southern Texas, southern parts of the Gulf States, 
and southeastern North Carolina (casually New Jersey) south over 
the greater part of Mexico to Guatemala and Cuba; occasional in 
Bermuda in migration; accidental in the British Isles. 
GrEeNus TACHYCINETA Capsanis. 
Tachycineta CABANIS, Mus. Hein., I, 1851, 48. Type, by subs. desig., 
Hirundo thalassina SWAINSON (Gray, 1855). 
Tachycinéta thalassina (SwaAINson). 
RanGe.— Western North America south to the Mexican highlands, 
and to Central America in winter. 
a. ([Tachycineta thalassina thalassina. Extralimital.] 
b. Tachycineta thalassina lépida Mmarns. Northern Violet-green Swallow. 
(615.] 
Tachycineta lepida Mearns, Proc. Biol. Soc. Wash., XV, March 5, 1902, 
31. (Laguna Mountains, 20 miles north of Campos, San Diego Co., 
California.) 
RanGe.— Western North America. Breeds from central Alaska, Yukon, 
and southern Alberta south to northern half of Lower California and northern 
Durango, east to western South Dakota and western Nebraska; winters in 
Mexico and south to Guatemala and Costa Rica; migrates through western 
Texas. 
