BIRDS OF NORTH AND MIDDLE AMERICA. 39 



bb. Head and neck not entirely black. 



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



cc. Pileum graj'ish brown. 



d. General color grayer; bill relatively s^horter and thicker (culmea averaging 

 18.54, depth at base 15.75, width of niandil)le at bat^e 13.97). 



Hesperiphona 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 (grayi.'^h 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) 

 ee. Pileum darker (dark grayi.sh brown or sepia); culmen averaging 19.81, 

 depth of bill at base 17.27, width oi mandil)le at base 12.45. 



Hesperiphona vespertina mexicana, female (p. 43) 



HESPERIPHONA VESPERTINA VESPERTINA (Cooper) 

 EVENING GROSBEAK. 



Adult luole. — Forehead (more or less broadly^) and superciliaiy 

 region j-ellow; rest of pileum l)lack; rest of head with neck and upper 

 back plain olive, lighter and more 3'ellowish olive on throat, changing 

 gradually to clear lemon yellow on scapulars and rump and to lighter 

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

 coverts sometimes partlj' white; upper tail-coverts and tail l)lack; 

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

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

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

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

 wing, 10o.0«J-llT.35 (lll.OU); tail, 62.90-71.12 (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, 13.21-15.21 (11.18): tarsus, 20.57-23.11 (21.84); 

 middle toe, 16.76-19.05 (17.78).- 



Adult femcde. — Above plain deep smoke grav, the head darker (more 

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

 hiudneck more or less tinged with yellowish olive-green; throat, abdo- 

 men, and under tail-coverts white, the tirst with a dusky (submalar) 

 streak along each side; rest of under parts light Inili'y grayish, usually 

 more or less tinged with 3'ellow, especially on sides of chest; axillars 

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

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

 gray with white terminal margins, 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 bufl'y grayish and white; tail black, with inner 



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

 - Twenty-two specimens. 



