BIRDS OF NORTH AND MIDDLE AMERICA. 39 



bb. Head and neck not entirely black. 



c. Pileum black Heaperiphona abeillii, female (p. 45) 



(V. Pileum grayish brown. 



d. (leneral color grayer; bill relatively shorter and thicker (culmen averaging 

 18.54, depth at base 15.75, width of mandible at base 13.97). 



Hesperipliona vespertina vespertina, female (p. 39) 



dd. General color more buffy or browner; bill relatively longer and narrower 



(culmen averaging 20.07 or more, depth at base averaging not more than 



17.27, width of mandible at base 13.72 or less). 



e. Pileum paler (grayish brown or deep hair brown) ; culmen averaging 20.07, 



depth of bill at base 15.75, width of mandible at base 13.72. 



Hesperiphona vespertina montana, female (p. 42) 

 ce. Pileum darker (dark grayish brown or sepia); culmen averaging 19.81, 

 depth of bill at base 17.27, width of mandible at base 12.45. 



Hesperiplioua vespertina mexicana, female (p. 43) 



HESPERIPHONA VESPERTINA VESPERTINA (Cooper) 

 EVENING GROSBEAK. 



Adult male. — Forehead (more or less broadly') and superciliary 

 region yellow; rest of pileum black; rest of head with neck and upper 

 back plain olive, lighter and more yellowish olive on throat, changing 

 gradually to clear lemon j^ellow on scapulars and rump and to lighter 

 (more citron) yellow on posterior under parts, the longer under tail- 

 coverts sometimes partly white; upper tail-coverts and tail black; 

 wings black, except innermost greater coverts and secondaries (ter- 

 tials) which are white or pale grajdsh, the former sometimes edged with 

 yellow; bill light olive-yellowish or pale yellowish green; iris brown; 

 legs and feet light brownish; length (skins), 171.45-195.58 (182.12); 

 wing, 105.66-11Y.35 (111.00); tail, 62.99-71.12 (66.55); culmen, 17.27- 

 20.57 (19.05); depth of bill at base, 15.49-17.78 (16.51); width of 

 mandible at base, 13.21-15.2-i (14.48); tarsus, 20.57-23.11 (21.84); 

 middle toe, 16.76-19.06 (17.78).' 



Adalt female. — Above plain deep smoke gi'ay, the head darker (more 

 mouse gray), the rump paler (pale smoke gray or light drab-gray), the 

 hindneck more or less tinged with j'ellowish olive-green; throat, abdo- 

 men, and under tail-coverts white, the first with a du.sky (submalar) 

 streak along each side; rest of under parts light buffy grayish, usually 

 more or less tinged with j-ellow, especially on sides of chest; axillars 

 and most of under wing-coverts light yellow; wings dull black, with 

 innermost greater coverts largel}' dull white, tertials largely light 

 gray with white terminal mai'gins, the primaries more or less edged 

 with white and pale gray, all except the three outermost quills white 

 at base, forming a distinct patch; upper tail-coverts black with large 

 terminal spots of pale buffy grayish and white; tail black, with inner 



^Varying in width from 5.08 to 15.24, averaging 8.89. 

 ^Twenty-two specimens. 



