48 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



occiput, hindneck, and sides of neck golden buff, .changing from deep 

 orange-buff to oil green, according to inclination of the light; throat 

 cinnamon-rufous, usually separated from black of chin by a narrow 

 line of pale bluish; back, scapulars, chest, and sides of, breast uniform 

 deep black; lesser wing-coverts rich campanula blue, the middle cov- 

 erts bright nile blue; rump glossy light blue (changing from nile blue 

 to turquoise); upper tail-coverts black, broadly margined with light 

 bluish green; wings (except lesser and middle coverts) black, the 

 greater coverts edged with light blue and greenish, the remiges and 

 rectrices with light yellowish green, more buffy on tertials; abdomen 

 and median portion of breast white; anal region and under tail-coverts 

 pale buffy, the latter with concealed central portion dusky; sides rich 

 campanula blue, passing into light greenish blue (turquoise or nile 

 blue) on flanks; bill black; legs and feet dusky (in dried skins); length 

 (skins), 116.8-132.1 (122.9); wing, 68.1-72.6 (71.1); tail, 45.7-50.8 

 (48.8); exposed culmen, 8.9-10.2 (9.7); depth of bill at base, 5.1-5.3 

 (5.1); tars'us, 16.3-18.5 (17.5); middle toe, 10.4r-12.7 (11.7).^ 



Adult female.—Y dry similar to the adult male and apparently not 

 always distinguishable, but usually slightly duller in coloration; length 

 (skins), 116.8-132.1 (123.2); wing, 65.5-69.9 (67.8); tail, 45.2-49.5 

 (47.2); exposed culmen, 10.2; depth of bill at base, 5.1-6.6 (5.3); tar- 

 sus, 17-17.8 (17.3); middle toe, 10.4-11.4 (10.9).' 



Young^ first plumage. — Head and neck (except chin and throat) dull 

 light green (chromium green), each feather with a small central spot 

 of dusky; loi-es, eyelids, anterior portion of malar region, and chin 

 dusky; throat, median line of chest (narrowly), median portion of 

 breast, and abdomen dull whitish, slightly tinged with yellowish; a 

 patch on each side of chest and breast greenish dusky; sides dull gray- 

 ish, becoming more buffy on flanks; anal region and under tail-coverts 

 pale buffy; back dull dusky greenish, with a blackish patch on each 

 side; lower back and rump dull greenish; lesser wing-coverts dull, 

 light greenish blue; middle coverts dusky basally, dull light bluish 

 green terminally; rest of wings and tail dusky, with yellowish green 

 edgings. 



* Three specimens, all from southern Mexico. 



