1902.] 



ANATOMY OF THE CONDOR. 



241 



shown in the drawings to which I have called attention. Here, 

 however, the reseml^lance ends. Foi- in the male bird I can find 

 no trace visil:)le to the naked eye of the muscular sheath which 

 covers this part of the bronchus in the hen bird. I have care- 

 fully looked for these muscles both in the fresh windpipe and 

 after it had been pi-esei-ved in alcohol. Thei-e is no doubt in my 

 mind that the difi'erence indicated does really exist. Moreover, 

 the rather abvmdant slips of muscle, which, in the hen bii-d, tie 

 down the end of the bi'onchus to the membranous sui-face of the 



Text-fiff. 30. 



M.T 



Lower eud of windpipe of male Sarcorliciiinilms grjjpkus, back view. 

 M.T, membrana tympaniformis. 



lung, are only just i^ecognizable in the cock bii-d. I found Vjut 

 one tiny slip (T in text-fig. 29) representing this veiy striking 

 featui-e of the windpipe of the female. This rec^uu-ed cai-eful 

 looking for ; there is nothing to stiike the eye forcibly. 



It appears, therefore, that in Sarcorharnqjhus gryphus certainly, 

 and in Sarcorhamjihus cequatorialis pi-oljably, there is a marked 

 difi'erence between the sexes in the conformation of the syrinx ; 

 and that, in the second place, the more C(jmplicated organ is that 

 of the female, and not of the male sex. These birds have no 



