MICEASTUR. 223 



barred with wlilte ; inner under %ying-co verts white. " Bill slate- 

 colour with yellow ochre at Lase ; cere, legs, and toes orange ; 

 claws brown " {H. Whitehj). 



Total length 305 mm., culmen 17, wing 185, tail 1-49, tarsus 04, 

 middle toe and claw 31. 



The description of the male is taken from an example obtained 

 on the Itaribisi River. 



Adult female. Similar to the adult male. AVing 198 mm. 

 "Bill, upper mandible bkiish-black, lower mandible greenish- 

 yellow ; cere blood orange-colour ; legs and toes yellow, claws 

 horn-colour ; iris white " (H. Whiteli/). 



There is considerable yariation in the barring on the under 

 surface in this species, w^hile some are almost uniform creamy- 

 wdiite others are very numerously barred ; this may, however, be 

 accounted for by age. 



Breeding-season. Unknown in British Guiana. 



Xest. Unrecorded in British Gruiana. 



Eggs. Undescribed from British Guiana. 



Range in British Guiana. Ituribisi River, Supenaam River, 

 Berbice, Tiger Creek (J/c<.'oyint'// collection); Kamakusa, Bartica 

 ( Wliitehj). 



Kxtralimital Range. Brazil, Eastern Peru. C'oloml)ia. 



Habits. Schomburgk says (Reis. Guian. iii. p. 738) that this 

 bird is called OJito by the '" AYarraus ■' and Mapillo by the 

 '■ Macusis." 



Mr. J. J. Quelch (Timehri (2) vi. p. 143) gives the following- 

 remarks on this species : — '' The Black-barred Harrier-Hawk 

 (Micrastur gilricoUis). This is a yery widely distributed species, 

 being commonly found on the coast, and in the immediate neigh- 

 bourhood of the town, as well as in the interior parts of the 

 colony, along the sheltered creeks and by the open savannahs. 

 It is one of the species that commonly goes by the name of 

 Chicken-Hawk." 



141. Micrastur interstes. 

 Casein's Barred Hawk. 



Jlicraslur inferstrs Haiif^s, Auk, xxiv. ji. 2S0, 1007 ( L;i Estrella, 

 Cartago, Cosfci Jiicaj ; linibourne it ChiiMi, B. S. Amor. i. ]>. 04, 

 no. oSJ), 1912. 



Adidt, Upper .surface dark slate-colour with white bars on the 



