712 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 
CYPSELOIDES BRUNNEITORQUES BRUNNEITORQUES (Lafresnaye). 
CHESTNUT-COLLARED SWIFT. 
Adult male.—Pileum sooty black, the feathers along each side, 
immediately above the lores, narrowly margined or edged with 
whitish; lores deep black posteriorly, more sooty anteriorly; chin, 
throat, and malar region dark sooty grayish brown; a broad collar 
round neck deep cinnamon-rufous or chestnut-rufous, sharply defined 
and clearer in color on hindneck, usually more or less broken on 
foreneck by dusky center to feathers; remainder of upper parts 
sooty black, of under parts deep sooty grayish brown; bill black; iris 
dark brown; feet grayish brown or dusky (in dried skins); length 
(skins), 112-131 (122); wing, 120-133 (126.7); tail, 40.5-51 (45.3); 
exposed culmen, 5.5-6.5 (5.8); tarsus, 11-13 (11.9); middle toe, 
7-8.5 (8).% 
Adult female—Similar to the adult male but without the rufous 
collar,® which is entirely replaced by the general dark sooty color; 
length (skins), 103-127 (116); wing, 121-130 (125.1); tail, 40-48 
(43.4); exposed culmen, 5.5-6.5 (5.9); tarsus, 11-12.5. (11.8); middle 
toe, 7.5-8.5 (7.8).¢ 
Young.—Similar to the adult female but texture of the plumage 
different (softer) and general coloration somewhat paler, especially 
on under parts, where, at least on flanks, abdomen, and under tail- 
« Seventeen specimens. 
b Among the seventeen specimens examinec whose sex was determined as female 
by their respective collectors are five which have the rufous collar, exactly as in 
adult males. Whether these indicate that the female eventually attains the colora- 
tion of the adult male, or that the sex was erroneously determined is a question; 
but I incline to the latter view. 
¢ Twelve specimens. 
Ex- r 
Locality. Wing. | Tail. | posed | Tarsus.| Middle 
culmen oe 
MALES, 
Ten adult males from Costa Rica....-..-...-..--..-..20.2--20ee 127.7 45. 2 5.7 11.8 7.9 
Four adult males from Guatemala (1) and Chiapas (3)..-....-.-- 124.9 45 5.8 12.1 8&1 
Three adult males from Vera Cruz........-.....-2---+-2-+--++- 126.7 45.3 5.8 11.9 8 
One adult male ( C. b. griseifrons) from Tepic..........-...----- 119 41 6.5 12.5 8.5 
FEMALES. 
One adult female from Peru........-...---.------- 2-222 eee eee 123 42 5.5 5 8 
Nine adult females from Costa Rica..............-.2...-.....eee 125.3 43.3 6 11.9 U7 
One adult female from Chiapas..........-..-----2--25---- 2-2 ee 126.5 46 5.5 11.5 8 
One adult female from Oaxaca......... 2.2.2.6... ee eee eee eee 124 42 5.5 12.5 8&5 
Two adult females ( C. b. griseifrons) from Tepfc.....-...-..-..- 122. 2 41.2 6 12,2 82 
Tam not able to discern any color differences between specimens from the different 
localities (except in case of those from Tepic). 
