TACHYCINETA. 461 
a. 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. Zggs .77 x 54. Hab. Whole of North America; south, 
in winter, through Middle America and West Indies to various parts of 
South America.............66. 613. C. erythrogaster (Bopp.). Barn Swallow. 
a’. 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 4.15-4:80, forked for 2.25-2.85. Hab. 
Kamtschatka and eastern Siberia in summer; south, in winter, to India. 
: C. tytleri (JzrD.). Kamtschatkan Barn Swallow.! 
Genus TACHYCINETA Casanis. (Page 458, pl. CXIV., 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 
asinsummer. Young: Above dull brownish slate. Nest in holes, usually of trees, 
sometimes in cliffs or buildings. gs 3-6, plain pure white. 
a’, 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 Jridoprocne Couzs.”) 
o'. Rump 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. Higgs .75 x .52. Hab. 
Whole of North America; wintering from southern Florida, Cuba, 
and Gulf coast, south to. Guatemala. 
614. T. bicolor (ViEiLu.). White-bellied Swallow. 
b°. Rump white (the feathers with fine blackish shaft-streaks) ; a white line 
on each side of forehead, along upper edge of lores. 
Otherwise like 7. bicolor, but much smaller; length about 4.10-4.80, 
wing 3.75-3.90, tail 1.80-1.90. Had. Coasts of Central America and 
1 Hirundo tytlert Jurv., B. Ind. iii. App. 1864, 870. (H. saturate Rivew. Pr. U. S. Nat. Mus. 1883, 95.) 
2 Iridoproene Cours, B. Col. Val. 1878, 412, Type, Hirundo bicolor Viztn, (See Barrp, Review Am. B. 
i. 1865, p. 296.) 
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