376 bulletin: museum of comparative zoology. 



Guiana, " Orinoko-Delta," Bogota, Para, Matte Grosso, and W. 

 Ecuador. 



M. c. RUFiPENNis Lawrence. 



Myiozetdes rvfipennis Lawrence, Ann. Lye. nat. hist., N. Y., 1869, 

 9, p. 267 (Valencia, Venezuela). Type — ^ American Museum of 

 Natural History. 



Venezuela. 



M. c. ERYTHROPTERUS (Laf resuayc) . 



Tyrannula erythroptera Lafresnaye, Rev. zool., 1853, p. 56 (Brazil). 

 Cotypes— M. C. Z. 



S. Brazil and Minas Geraes. 



The bird from W. Ecuador he thought might represent another 

 form. 



Ridgway (Bull. 50, U. S. N. M., 1907, pt. 4, p. 443) did not consider 

 M. c. rvfipennis a distinct subspecies, and placed the name in the 

 synonymy of M. c. cayancnsis. Later writers, including Hellmayr, 

 have not followed this view, but have recognized rufipennis. 



Recently Hartert and Goodson (Nov. zool., 1917, 24, p. 412) have 

 separated the West Ecuadorian form concerning which Hellmayr had 

 expressed a doubt, naming it M. c. hellmayri, type-locality Cachabe, 

 N. W. Ecuador. They also called attention to the slightly smaller 

 size and grayer coloration of birds from Panama, but owing to lack 

 of material did not come to a decision in regard to these. 



MusciFUR, gen. nov. 



Type. — Myiarchus seviirufus Sclater and Salvin, Proc. Zool. soc. 

 London, 1878, p. 138, pi. 11. 



Generic characters. — Superficially resembling Myiarchus Cabanis. 

 BiU flat as in the subgenus Onychopterus Reichenbach, not deep as in true 

 Myiarchus; lateral edges decidedly convex, not straight. Wing rounded, not 

 pointed; third (from outside), fourth, and fifth primaries longest; second about 

 equal to sixth; first decidedly short, shorter than ninth; distance from longest 

 primary to distal secondaries not more than length of middle toe without claw. 

 Tail rounded, about equal to length of wing. Upper parts brownish olive, like 

 the head; wings and tail rufous or with rufous edgings; lower parts uniform 

 rufous, entirely lacking the characteristic gray breast and yellow belly of 

 Myiarchus. 



The only species contained in the new genus is Mv^cijur seviirufus 

 (Sclater and Salvin). 



