286 TITRDID-E. 



brown. Bill yellow. Wings with the fourth, fifth, aud sixth pri- 

 maries nearly equal aud longest, second primary ijitermediate in 

 length between the niuth and tenth, bastard primary I'lo to 1"1 inch, 

 rather more than half the length of tlie second. Legs, feet, and 

 claws brown. Length of wing 3'35 inches (female 3'2), tail 3"05 

 to 3"0 (female 2*8), culmen 0'7 to 0"(58, tarsus 1'4 to 1"3. 



The supposed /t'/HrtZc differs from the male iu being somewhat 

 more suffused with dark olive-brown, es])ecially on the head. Birds 

 of the ijear aud yoniic/ in Jirst j^Iumar/e are unknown. 



This form agrees in dimensions with the Ecuador form, but slightly 

 differs in colour as described. 



The Bolivian Thrush-llobin has only been obtained on one of the 

 forest-clad spurs of the Andes in Eastern Bolivia, where it is be- 

 lieved to be a resident. 



3. Catharus mexicanus. 



Malacocychla mexicanus, £]>. Compt. Hetid. Ixiii. p. 998 (1856); 



Sclate'r*, P. Z. S. 1857, p. 20.3 ; 8d. &,- Salv.* Ibis, 1859, p. 7. 

 Catharus mexicanus {Bp.), Sclater, P. Z. S. 1859, p. 324; Baird, 



Rev. Am. B. p. 11 (1864); Mater, P. Z. S. 1864, p. 172; Sahin, 



P. Z. S. 1866, p. 69 ; Z«hv. Ann. Lye. K Y. ix. p. 90 (1868) ; 



Sumichrast, Mem. Boat. 8oc. N. H. i. p. 542 (1869) ; Salmn, P. Z. S. 



1870, p. 179 ; (Sf7. iSj- Salv. Xvmencl. Av. Neotr. p. 1 (1873) ; Sah. 



8f Oodm. Biol. Centr.-Amer. Zool, Ares, i. p. 6 (1879). 

 Turdus mexicanus {Bp.), Gray, Handl. B. i. p. 259. no. 3784 



(1869). 



In the adult male and female the head, nape, lores, and the 

 feathers immediately below and behind the eye are black, slightly 

 suffused with olive-brown on the forehead ; the rest of the upper 

 parts dark olive-brown, still darker and browner on the inner webs 

 of the quills and tail-feathers. Undcrparts, including the ear-coverts, 

 pale slate-grey, very pale on the chin and throat, nearly white on 

 the centre of the belly and under toil-coverts, aud more or less suf- 

 fused with dark olive-brown on the axillaries, \inder wing-coverts, 

 sides of the breast, and flanks; inner margin of quills palisii brown. 

 Bill with the upper mandible dark broAMi, and the lower mandible 

 "yellow. AVing with the fourth and fifth primaries nearly equal and 

 longest, second primary intermediate in length between the seventh 

 and eighth, bastard primary 0'9 to 0'75 inch, about a third the 

 length of the .second. Legs, feet, and claws pale yellow. Length 

 of wing 3"5 to 3-25 inches, tail 2'5 to 2-35, culmen 0-7 to 0-G5, 

 tarsus 1*35 to 1-25. 



It is not known that ihe female differs from the male. In what 

 I take to be birds of the year, the quills and tail-feathers are almost 

 the same colour as the back, the black of the head is suffused with 

 olive-brown, and the pale slate-grey of the underparts is replaced 

 by pale brown. Touvg in first plumage are unknown. 



* Spelt MalacocichJa me.xicana. 



