MICROPUS. 303 



tic"il-ovate, plain pure white. ITab. Eastern North America, north 

 to Labrador and to 50° in the intei-ior, west to edtjc dC (ireat 



Phiins 423. C. pelagica (Linn.). CMmney Swift. 



b\ Win-; docidedlj' less than 5.00. 



c'. Eunio, upper tail-coverts, and tail light sooty gra3-ish, very much 

 lighter than the olive-dusky back ; breast and belly light sooty 

 gra3-ish ; length about 4.15-4.50, wing 4.30-4.75, tail (including 

 spines) 1.50-1.90. ]S\'st like that of C. pelagica, but only (?) in hol- 

 low trees. Eijgs .71 X -49. Hab. 'Western United Stales (chiefly 

 Pacific coast), north to British Columbia ; south, in winter, to 



Guatemala 424. C. vauxii (Towns.). Vanx's Swift. 



c'. Upper parts entirely blackish (very slightly paler on rump, etc.), glossed 

 with olive-greenish on back and with bluish on wings; breast and 

 belly deep soot}' grayish brown ; wing 4.20-4.60, tail (including 

 spines) 1.70-1.75.' Hab. Southern Mexico (Yucatan, including 

 Cozumel, Tehuantepec, etc.), Guatemala, and south to Costa Eiea. 

 C. gaumeri Lawr. Gaumer's Chimney Swift.^ 

 a'. Throat not paler than rest of under parts ; male with a broad collar of rufous 

 round neck ; length about 4.75-5.00, wing 4.80-5.20, tail 1.80-2.10. Hab. Cen- 

 tral America, north to eastern Mexico (Orizaba), south to Ecuador. 



C. brunneitorques Lafr. Lafresnayes Chimney Swift.' 



Genus AERONAUTES Hartert.* (Page 302, pi. LXXXIX., fig. 4.) 

 /Species. 

 Above dull blackish, usually becoming lighter and grayer on forehead ; sides 

 and under tail-coverts also dull blackish; other lower parts, tips of secondaries 

 (outer webs onlj-), and a patch on each side of rump, white; length 6.50-7.00, wing 

 5.30-5.90, tail 2.50-2.70. Hitb. Western United States (in mountains), and south to 

 Guatemala 425. A. melanoleucus (Baird). White-throated Swift. 



Family TROCHILID^. — The Hummingbirds. (Page 297.) 



{Xest a beautifully felted cup-shaped structure, composed of plant-down, 

 spiders' webs, lichens, etc. — the last exteriorly, the fii-st internallj-. E'jgs 2, eilipti- 

 calovate or elliptical-oval, large in proportion to size of the bird, plain pure white.) 



Genera.' 

 a*. Anterior toes united for basal half; bill much compressed (except at base), about 



* These !<pincs asually worn entirely oflF in Yucatan specimens. 



» Chxtarn gnumeri Lawr., Ann. N. Y. Ac. Sci. ii. No. 8, March, 1SS2, 245. 

 ' ChriMrn hrunntitorquct Lafr., Rev. Zool. 1814, 81. 



* AironmiUi Habtert, Cat. B. Brit. .Mus. xvi. 1,S92, 459. Type, Cypttlut mtlanoleuciu Baird. 



* Charnctcra of all the Mexican genera arc given, for the reason that almost any species of Hummingbird 

 found OD the table-lands or mouDtaius of Mexico may reasonably be expected to occur within our borders. In 



