• PLANESTICUR. 385 



The specimen on which the description is based was collected 

 by Mr. McGonnell at Mount lioraima during his expedition in 

 October 1898. 



Breeding-season. Unknown. 



Nest. Unrecorded'. . 



Eggs. Undescribed. 



Range confined to Bntish Guiana. Mount Roraima, AraWai 

 River (McConnell collection); Mount Roraima and Merume 

 Mountains ( WMtely). 



Habits. Unrecorded. 



587. Planesticus arthuri. 



Arthur's Thrush. 



(Plate V. fig. 2.) 



Planesticus arthuri Chubb, Bull. Brit. Orn. Club, xxxiii. p. 131, 1914. 



Adult. General colour above including the ci"own o£ the head, 

 back, wings, and tail dusky greyish brown; sides of the face 

 similar to the back; throat white broadly streaked with dark 

 brown ; breast, abdomen, and sides of the body dark ash- 

 grey; vent and under tail-coverts white; axillaries pale grey; 

 under wing-coverts pale ochreous; under surface of flight-quills 

 and lower aspect of tail greyish brown. 



Total length 202 mm., exposed culmen 15, wing 105, tail 80, 

 tarsus 30. 



The above description is taken from the type of the species 

 which was collected on the Abary River in September 1906. 



Juv. Crown of head, sides of face, entire back, wings, and tail 

 dusky brown with ferruginous shaft-lines to the feathers on the 

 bead, sides of face, mantle, upper back, and upper wing-coverts ; 

 throat, breast, abdomen, sides of the body, and under wing- 

 coverts ferruginous with dark spots, or bars to the feathers and 

 more or less white on the abdomen ; under tail-coverts greyish 

 white. 



The specimen from which the above description is taken was 

 collected on the Makauria River in August 1910. 



Breeding-season. Unknown. 



Nest. Unrecorded. 



Eggs. Undescribed. 

 VOL, II. 2 c 



