178 



THE AMERICAN NATURALIST [Vol. XLI 



If the specimens examined by me are correctly sexed, there 

 is also no average difference in size between the sexes in any of 

 the species or subspecies. All, however, vary much in size indi- 

 vidually, in fact to a deorcc 1 am ^^•h()lly unable to account for. 



KIN(; NOKTIT OF PaXAMA 



A. Sexes alike in color. 



1. Under wing-coverts banded black and white 



A. axillaris Lawr. 



1. Under wing-coverts banded l)lack and cinnamon-rufous or 



2. Back of head, between gray forehead and gray neck not 

 distinctly chestnut, but grayish-brown or l)rownisli-gray 



A. cajanca (Miill.). 



2. Back of head distinctly chestnut 3. 



3. Back concolor, olive 4. 



3. Back not concolor; olivaceous-tawny anteriorly, olive pos- 

 teriorly . . . A. alhivcniris flumhei colli s (Zelcdon). 



4. General color paler; light colored crcsc(Mit around the bhu-k 

 belly j)atch, ver\' wide, white 



4. General color darker; light colored crescent around the 

 black belly patch, narrow, fulvous 



A. alhiventris mexicarms nobis. 



. 1 ramidrs a.rll/ari.s- I .awr. Troc. IMiii. Acad. p. 107, bSGS. Sharpe 

 Cat. Bird^ Hr. Mii^ 23, p r.C. n\n\. (Vnt. Am., Aves vol. 



3, p. 31S, pi. LXW ll, is'.i: I'lOl. 



Typk Uo<m.itv. IJarniM.nu-lla, ( '< .lonil.ia. Type, now No. 

 45655, Ameri<-aii Mu>fu f Nat. Hist., New ^'oI■k. exainii.ed. 



It iia> been .upp«,MMl that tluMV ua. a bivak in tli.- ranuv of 

 this species and that it did not occur in southern (Vntral America 

 south of Honduras. There is, however, in the Cndcrwood collec- 

 tion, lately purchased by John E. Thayer Ivscp. a young example 



