BIRDS OF WESTERN COLOMBIA. 11, 'J 5 



having previously been known only as an inhabitant of Eastern 

 Panama.* 



The bird agrees very well with Ridgway's description except 

 for its slightly larger size t and the colour of the pileum, which 



I should call sooty-blackish rather than sooty-brown. From 

 C. parviis Pelz. % it differs in its duller, less greenish back and 

 white throat (instead of yellow like the remaining luider parts). 

 In structural characters the two species are perfectly alike. 



So far as I know, the above is the only specimen existing in any 

 European Museum. 



79. Myiobius sulphureipygius villosus Scl. 



\Tyrann'ula sulj^hureipygia Sclater, P. Z. kS. 1856, p. 296 (Jan. 

 1857.— Cordova, Mexico).] 



Myiobnis villosus Sclater, P. Z. S. 1860, p. 93 (I860.— 

 Nanegal, W.Ecuador); Sclater & Salvin, P. Z. S. 1879, p. 514 

 (Frontino). 



M. sulphureipygius (errore) Oassin, Proc. Acad. N. Sci. Philad. 

 1860, p. 144 (Kio Truando). 



No. 2427. 6 ad. Novita : 22.xii.08.— Wing 63 ; tail 54 ; bill 



II mm. 



" Iris dark brown, feet grey, maxilla black, mandible pink." 



This bird, like others from Western Ecuador, differs from 

 M. s. aureatus Bangs §, of Chiriqui and Costa Rica (Pozo Azul), 

 in its darker, more brownish-green back, deeper ochraceous chest 

 and sides, and more brownish under tail-coverts. The differences 

 between the two races, though slight, appear to be quite constant. 

 Mr. Ptidgway || makes M. suljyhureipygius a subsj^ecies of M. xan- 

 ihopygus [=mastacalis Wied ^], but this is certainly wrong. 



31. h. mastacalis is mei^ely the southern form of 31. harbatios, 

 the two being completely connected by intermediates in ISTorth- 

 eastern and Northern Brazil (Piauhy, Maranhao, Para, Rio 

 Madeira). The representative of the barhatics group in Western 

 Ecuador, Colombia, Panama, and Costa Rica is 3f. h. atricaudus 

 Lawr., which is clearly specifically distinct from 31. s. villosns, 

 with which it occurs in many localities. Mr. Rosenberg's cor- 

 respondents sent numbers of both forms from the same places 

 in N.W. Ecuador. 



* Whetlier the newly described C. a. distlnctus Ridjrw. (Proc. Biol, Soc. Wash, 

 xxi. 1908, p. 191 — Rio Reventa/,6n, near Guayabo, E. Costa Rica) is really distinct 

 can, of course, only be decided when series trom Panama and Eastern Costa Rica 

 become available. 



t Ridgway gives for Panama specimens the following measurements : wing, $ 

 V9i, ? 77; tail, $ 6b\, ? 66; bill 1(3, l&k mm. 



X PitatiffHS parvus Pelzeln, Zur Ornith. liras. ii. pp. Ill, 181 (1868, — Marabi- 

 tanas. Rio Negro). 



§ M. xantJwpygus auveatus Bangs, Proc. New Engl. Zool. CI. iv. p. 27 (1908. — • 

 Chiriqui). 



II Bull. U.S. Mus. no. 50, pt. iv. p. 490. ' 



^ Cfr. Hellmayr, Abhandl. Akad. Wiss. Miiuchen, ii. CI., xxii. 3, 19U6, pp. Ul-Z. 



