TACHYCINETA. 461 



a 1 . Paler : Lower parts tawny cinnamon or pale rusty in adult male (the chin 

 and throat rusty cinnamon), pale cinnamon-buffy in adult female ; length 

 5.75-7.75, wing about 4.60-4.90, tail 3.70-4.10, forked, in adult male, for 

 about 1.85-2.10. Eggs .77 X -54. Hab. Whole of North America ; south, 

 in winter, through Middle America and West Indies to various parts of 

 South America.. 613. C. erythrogaster (Bodd.). Barn Swallow. 



a 2 . Darker: Lower parts bright cinnamon-rusty (much like throat of C. erythro- 

 gaster), the chin and throat rich rusty chestnut; length about 7.00-8.00, 

 wing 4.60-4.80, tail of adult male 4.15^.80, forked for 2.25-2.85. Hab. 

 Kamtschatka and eastern Siberia in summer ; south, in winter, to India. 



C. tytleri (Jerd.). Kamtschatkan Barn Swallow. 1 



Genus TACHYCINETA Cabanis. (Page 458, pi. CXIY., fig. 6.) 



Species. 



Common Characters. — Lower parts entirely white. Adults glossy dark steel- 

 blue above, or else rich soft velvety bronze-green, varied with tints of purplish, 

 violet, etc., the females usually considerably duller than the males ; in winter, the 

 secondaries (especially tertials) conspicuously margined with white, but otherwise 

 as in summer. Young: Above dull brownish slate. Nest in holes, usually of trees, 

 sometimes in cliffs or buildings. Eggs 3-6, plain pure white. 



a 1 . Ear-coverts dark steel-blue, or dusky, like upper parts ; feathers of lower parts 

 entirely pure white, except at extreme base ; upper parts in adult uniform 

 glossy steel-blue, varying to greenish. (Subgenus Iridoprocne Coues. 2 ) 

 b 1 . Eump steel-blue (adult) or dull slate (young) like rest of upper parts ; no 

 white on sides of forehead. 

 Adult male : Above rich burnished steel-blue (varying much in shade), 

 the larger wing-feathers and tail blackish, faintly glossed with dull 

 greenish ; lores deep black ; entire lower parts pure white. Adult 

 female: Usually duller above than male, but often undistinguish- 

 able. Young : Above entirely dull brownish slate. Length 5.00- 

 6.25, wing about 4.50-4.80, tail 2.30-2.50. Eggs .75 X -52. Hab. 

 Whole of North America ; wintering from southern Florida, Cuba, 

 and Gulf coast, south to Guatemala. 



614. T. bicolor (Vieill.). White-bellied Swallow. 

 b z . Eump white (the feathers with fine blackish shaft-streaks) ; a white line 

 on each side of forehead, along upper edge of lores. 



Otherwise like T. bicolor, but much smaller ; length about 4.10^1.80, 

 wing 3.75-3.90, tail 1.80-1.90. Hab. Coasts of Central America and 



1 Hirundo tytleri Jerd., B. Ind. iii. App. 1864, 870. (H. saturata Bjdgw. Pr. U. S. Nat. Mas. 1883, 95.) 

 1 Iridoprocne Coues, B. Col. Val. 1878, 412. Type, Hirundo bicolor Vieill. (See Baied, Review Am. B. 

 i. 1865, p. 296.) 



