534 Bulletin American Museum of Natural History. [Vol. XXXVI, 



than others from British Guiana but my material from neither region is 

 satisfactory. 



La Moreha, 3 im.; Florencia, 1 im. 



(3523) Planesticus tristis daguse (Berl.). 



Turdus dagucB Berl., Om. Monatsb., V, 1897, p. 176 (San los6, Col.)- 



Turdus tristis daguce Hellm., P. Z. S., 1911, p. 1086 (San Joaquim; Sipi; N6vita). 



Evidently restricted to the Tropical Zone of the Pacific coast, where it 

 apparently represents P. t. cnephosa of Chiriqui and northward, though 

 there are no records of this species between western Colombia and western 

 Panama. 



Juntas de Tamana, 1; Novita, 1; San Jose, 3. 



(3528) Planesticus gymnopthalmus (Cab.). 



Turdus gymnopthalmus Cab., Schomb. Reis. Guian., Ill, 1848, p. 665 (British 

 Guiana) . 



Common at Villavicencio but apparently not ascending the mountains, 

 since it was not found at Buena Vista. Two specimens agree with Lower 

 Orinoco and Trinidad examples. 



Villavicencio, 2. 



(3531) Planesticus ignobilis ignobilis (ScL). 



. Turdus ignobilis Scl., P. Z. S., 1857, p. 273 ('Bogota,'; I suggest Fusugasugd); 

 ScL. & Salv., p. Z. S., 1879, p. 491 (Retire; Cauoa; Sta. Elena). 



Merula ignobilis Stone, Proo. Acad. N. S. Phila., 1899, p. 312 (R. Totare, Plains 

 of Tolima and Ibagiie). 



Two fosms of this Thrush occur in the Bogota region, one in the 

 Tropical Zone of the western slope, and one in the Tropical Zone of the 

 eastern slope of the Eastern Andes. The former is the larger (5 males 

 average, wing 118.4 mm.; tail, 96.6 mm.; 5 females, wing, 114mm.; tail, 

 92.2 mm.) and should, therefore, receive the name ignobilis the type of 

 which measures wing, 115 mm.; tail, 99 mm.; while the eastern slope form 

 never reaches this size (5 males average, wing, 108 mm.; tail, 83.6 mm.; 

 5 females, wing, 104 mm.; tail, 79.4 mm.). There are also differences in 

 color, the larger and more western bird having the throat with little or no 

 pure white, the breast and rest of the underparts more heavily washed and 

 browner. 



True igiwhilis is thus restricted to the Tropical Zone of the Magdalena 



