Ari'EXDIX B. 



117 



APPENDIX B. 



On some Species of the Genus Micrastur. 



The Norwich jNIuseum aucl the collection of Messrs. Salvin 

 and Godmau contain six examples of a Micrastur which 

 resembles the greyer-backed adults of M. guerilla, but notice- 

 ably differs from these in having the jugulum suffused with 

 rufescent bufF^ extending over the transverse dark and pale bars, 

 instead of these bars being either devoid of any such colour- 

 ing or suffused with greyish brown with no tinge of fulvous 

 or rufous, one or other of these alternative plumages always 

 char^rpterizing the adult of the true M. yaerilla, from the 

 greyer-backed examples of which this Micrastur does not 

 otherwise differ. In two specimens of this fulvous-chested 

 Micrastur which I have examined the mantle is decidedly 

 grey, in one it is brownish grey, and in the remaining three 

 it is grey mingled with brown, the latter tint appearing chiefly 

 on the edges of the wing-coverts and of the lower scapulars. 



The following are the localities and measurements of the 

 specimens above alluded to : — 



Wing. Tail. 



Tarsus. 



Outer Middle 

 toe *■. u. toe s. u 



Inner 



toe s. u. 



Cul- 

 men 



s. e. 



No. 1. Bahia. Coll. Salvin 

 and Godman 



No. i>. Ditto. Ditto 



No. y. Venezuela. Norwich 

 Museum 



No. 4. U.S. Colombia. Do. 



No. 6. " Brazil." Do 



No. 6. " South America." 

 Do 



6-90 

 6-70 



6-90 

 6-80 

 6-80 



705 



6(50 

 (5-GO 



710 

 (3G0 

 0-70 



6-75 



2-40 

 2-2.5 



2-20 

 2 20 

 2-20 



070 



0-80 



llo 

 1-20 



0-70 MO 



0-70 1-10 



0-80 l-2o 



070 , 1-1.5 



0-70 

 0-75 



0-05 

 0-65 

 0-75 



0-00 



0-60 

 060 



0-60 

 0-60 

 0-65 



0-60 



