DYSITHAMNUS. 21 



feet are slender and weak. Coloration: the male and female differ 

 in colour of plumuge. 



Kerj to the Species. 



A. Throat lead-grey like the rest of the 



under surface in the male. 

 a. Crown of head dark lead-grey ; lesser 



upper wing-coverts blackish D. spodionofiis, c? , p. 21. 



«'. Ci'own of head rufous ; back nifous- 



brown ; middle of abdomen white. D. spodlouotus, § , p. 22. 

 h. Crown of head pale lead-grey; lesser 



upper wing-coverts also grey D. murinus, 6 , p. 22. 



h'. Crown of head dull rufous; back 

 ochreous-brown ; middle of abdo- 

 men isabelline D. miorinus, $ , p. 23. 



B. Thi'oat bhick in contrast to the grey 



under surface in the male D. saturninus, d, p. 23. 



c. Crown of head ochreous-brown like the 

 back; middle of the abdomen fawn- 

 colour D. safurninus, $ , p. 23. 



360. Dysithaniiius spodionotus. 



Ashy-backed Bush-bird. 



Dysithamnus spodionotus Salvin & Godman, Ibis, 1883, p. 211 (Eoraima); 

 Salvin, Ibis, 1885, p. 424 (Eoraima, 3500 ft.); Sclater, Cat. B. Brit. 

 Mus. XV. p. 222, 1890 (Eoraima) ; Brabom-ne & Chubb, B. S. Amer. 

 i. p. 194, no. 1941, 1912. 



Adult male. General colour above dark slate-colour, darker and 

 inclining to black on the head ; upper wing-coverts black edged 

 with white ; primary and secondary quills dark brown, edged with 

 slate-grey on the outer webs ; tail black, fringed with white at the 

 tip ; under surface for the most part ash-grey, darker and more 

 slate-grey on the sides of the body. 



Total length 105 mm., exposed culmeu 17, wing 64, tail 35, 

 tarsus 20. 



The male from which the description is taken was collected on 

 the Makauria Kiver in August lUlO. 



Immature male. Differs from the adult male in having the uppei 

 surface olive-brown with a tinge of chestnut on the liead ; throat 

 pale ash-grey, middle of abdomen white ; breast and sides of tlie 

 body pale olive-brown ; under tail-coverts pale fulvous ; under 

 wing-coverts white, inner edge of (juills below buffy-whitc. 



The young male described was collected by Mr. McC'ouncli at 

 Mount Korainia in October 1808. 



