BIRDS OF NORTH AND MIDDLE AMERICA. 



655 



KEV TO THE SUBSPECIES OK CARYOTHRAUSTES. 



[Rump, upper tail-coverts, and flanks dull gray; abdoinen dull white; under tail- 

 coverts gray margined with dull whitish. ( Caryothrausles poUogaster. ) J 

 a. Larger (wing more than 88.90, averaging 94.74; tail averaging 74.68); scapulars 

 gray, like rump. (Southern Mexico to northwestern Honduras. ) 



Caryothranstes poliogaater poliogaster (p. 665). 

 00. Smaller (wing not more than 88.90, averaging 86.11; -tail averaging 68.58); scap- 

 ulars olive-green, like back and wings. (Southeastern Honduras to Isthmus 

 of Panama.) Caryothraustes poliogaster scapularia (p. 656). 



CARYOTHRAUSTES POLIOGASTER POLIOGASTER (Du Bus). 

 BISHOP GROSBEAK. 



Adaclts {sexes alike). — Lores, orbits, anterior half of malar region, 

 chin, and upper throat black; rest of head, together with neck, chest, 

 and breast, yellow (lemon or gamboge), purest on forehead and lower 

 throat, elsewhere more or less tinged with olive, especially on occiput 

 and hindneck, which incline more or less strongly to olive-green; upper 

 back, wings, and tail yellowish olive-green; scapulars, lower back, 

 rump, and upper tail-coverts plain slate-gray; sides and flanks light 

 gray, fading into paler gray or grayish white on abdomen; under tail- 

 coverts pale brownish graj^ centrally, broadly margined with dull buffy 

 whitish; axillars, under wing-coverts, and edges of inner webs of 

 remiges clear light chrome or lemon yellow; bill black, basal portion 

 bluish gray; legs and feet dusky (bluish gray or gi'ayish blue in life?). 



Adult maZe.— Length (skins), 170.18-195.58 (179.58); wing, 88.90- 

 100.84: (95.00); tail, 72.90-80.01 (75.44); exposed culmen, 15.24-17.53 

 (16.51); depth of bill at base, 12.70-14.22 (13.21); tarsus, 21.84-23.88 

 (22.86); middle toe, 14.22-16.51 (15.24).^ 



Adult female.— Length (skins), 162.56-167.64 (165.10); wing, 88.90- 

 89.41 (89.15); tail, 66.55-71.63 (69.09); exposed culmen, 15.24-16.00 

 (15.49); tarsus, 11.94-12.96 (12.45); middle toe, 14.22-15.24(14.73).' 



' Eight specimens. 



' Two specimens. 



Specimens from Honduras are smaller than those from Guatemala, the latter being 

 smaller than those from Mexico; but I am not able to detect any color differences. 

 Specimens from the three countries average respectively as follows: 



