APPENDIX B. 123 



are not greater than may reasonably be accounted for either 

 by difference of sex or by individual variation. The markings 

 and coloration of these specimens I will now endeavour 

 succinctly to describe, and I think that they bear out the 

 conclusion which I have already indicated. 



No. 1. Adult male, Sarayacu, Upper Ucayali, type of M. pel- 

 zelni (shot 2nd August). — Entire upper surface plumbeous, 

 tinged with brown on the lower scapulars, wings, wing-coverts, 

 and tail, which latter has two narrow and somewhat indistinct 

 whitish cross bars with a similar tip ; cheeks and ear-coverts a 

 lighter plumbeous ; a similar but still paler tint on the chin, 

 throat, and jugulum ; from thence to the exti^emity of the 

 under tail-coverts the whole under surface, including the under 

 wing-coverts and axillaries, regularly cross-ban'cd with alter- 

 nate bands of black and white ; on the upper breast the depth 

 of these bands is about equal, but from thence downwards that 

 of the black decreases and the white increases, till, on the 

 under tail-coverts, the black bands are mere lines about a 

 quarter of an inch apart ; the bill is black, but the base of 

 the lower mandible and that of the upper, along the tomia, 

 is a yellow horn-colour. 



No. 2. Adult male, British Guiana (shot 22nd April). — 

 Only differs from No. 1 in having the black bars on the 

 abdomen and under tail-coverts somewhat more strongly 

 marked. 



No. 3. Adult male, British Guiana (shot IZth June) . — Closely 

 resembles No. 1, from Avhich it only differs in the inner 

 lower portion of the under wing-coverts being immaculate, 

 and in having three pale cross bars on the tail besides 

 the tip. 



No. 4. Adult male [unless wrongly sexed), British Guiana 

 (shot 21st February). — This specimen is a clear plumbeous 

 on the upper parts, with no tinge of brown, but the tail 

 blackish, with two narrow transverse bands and the tip pure 

 white and well defined; it has the dark cross bars on the 

 breast and abdomen broader than in No. 1, and on the 

 upper breast broader than the white bars ; the under tail- 

 coverts are white, spotted with plumbeous, some of the spots 



