456 



BULLETIN 50, UNITP:D STATES XATIONAL MUSEUM. 



breast, and al)d()iiuMi white; a lu'oad Mack hand acros> chest; .sides 

 and flanks olive, or grayish washed with olive; upper parts (except 

 pileum ar.d hindneck) plain olive-green, varying much in shade, some- 

 times brownish or dusky; edge and l)end of wing bright yellow; bill 

 light yellowish (orange or orange-r(>d in life), partly dusky in younger 

 birds; iris brown; legs and feet varying from deep to pale horn 

 brownish. 



Immatif.re. S'umhir to adults l)ut colors duller, the median crown- 

 stripe more or less olivaceous, the jugular collar partly brownish, and 

 the white of under parts, etc., more or less tinged with bufl'. 



Towig. — Uniform sooty olive, paler on throat and abdomen. 



Adxdt viale.—hQngth (skins), US.59-167.64 (154.94); wing, 78.66- 

 84.58 (78.49); tail, 58.93-74.17 (67.31); exposed eulmen, 14.73-16.51 

 (15.49); depth of bill at base, 8.89-10.92 (9.91); tarsus, 25.40-28.19 

 (27.18); middle toe, 16.51-19.05 (17.53).' 



Adult female.—ljQngt\i (skins), 137.16-149.86 (144.53); wing, 7<».6l- 

 75.69 (72.90); tail, 59.69-66.55 (62.48); exposed eulmen, 13.97-16.00 

 (15.24); depth of bill at base, 8.64-10.16 (9.14); tarsus, 25.91-27.94 

 (27.18); middle toe, 16.51-18.29 (17.53).-' 



1 Eleven specimens! . 



^ Nine specimens. 



I am unable to make out any Hutliciently well defined geographic variation in this 

 species, and therefore can not recognize Mr. Cherrie's A. a. saturatus, although the 

 material upon which the supposed subspecies was based (including the type) , together 

 with additional specimens, has been carefully exauiined. To a certain extent the 

 alleged difference in coloration between specimens from opposite sides of Central 

 America is apparent; but in my opinion it is not suthciently constant to warrant 

 subspecific separation. Average measurements are as follows: 



Locality. 



Wing. 



Ex- Depth 

 Tail. posed of bill Tarsus, 

 'eulmen. at base. 



Middle 

 toe. 



MALES. 



Six adult males oi A. nurnntiironti-is (Panama to 

 Co.sta Rica) 



Five adult males of ^. a. "saturatus" (Veragua to 

 Nicaragua) 



FEMAI.KS. 



78. 99 

 77. 98 



67. ,56 1 15.49 



I 



1 



67.06 15.24 



Four adult females .1. aimintiirostris (Panama to 



Guatemala) | 73.41 62.74 | l.x49 



Five adult females of ^l.o. '•saturatus ' (Costa Rica 



to Honduras) | 73.15 62.48 i 14.99 



SEX NOT DKTEKMINED. 



Five unsexed specimens of -1. '(. '■«t/(n'«<«s" from ' j 



Guatemala 81.53 71..37 j 16.00 



10.16 

 9.65 



9.65 



26. 92 

 27.43 



9.65 27.43 



9.91 27.94 



17. .53 



17.78 



17. .53 

 17.27 



18.08 



As may be seen from the above, Guatemalan specimens average decidedly larger 

 than those from more southern localities, and it is possible that with a good series of 

 specimens, with sex determined and exact locality recorded, the validity of A. a. 

 satunttas (the type of whicJi is from Choctum, Vera Paz) may lie established. 



