Todd — Studies in the Tyrannidce. 195 



ferox, with which it has clearly nothing to do, being in fact merely a slightly 

 larger race of pelzelni, very doubtfully worthy of formal recognition. Again 

 in 1913, with only a single specimen of rather unusual character before him, 

 the present writer was misled into perpetrating another synonym for the 

 same bird, comparing it with specimens of Myiarchus ferox swainsoni from 

 Paraguay which had been erroneously determined. In order to settle the 

 status of fortirostris beyond question, topotypical specimens were recently 

 sent to Mr. C. E. Hellmayr for comparison with Cabanis' type oi ferodor, 

 and he reports that they are the same. 



While it is true that Argentine specimens are larger than those from 

 northern Brazil, there appears to be no difference in color. No sexed speci- 

 mens in good condition from Bahia, the type-locality, are available at this 

 writing, but taking the series as a whole the propriety of recognizing two 

 forms, based wholly on difference in size, is questionable, and we prefer to 

 refer them to a single variable species, easily recognized by its generally 

 paler, more uniform coloration as compared with any of the forms of ferox, 

 as well as by its different proportions. In ferox the wing is but little longer 

 (occasionally even shorter) than the tail, with a very short tip, and short 

 outermost primary, always decidedly shorter than the fourth. In pelzelni 

 the wing is relatively longer, approximately one-tenth more than the tail, 

 with a longer tip, and longer outermost primary, exceeding the fourth or but 

 little less. The bill, too, averages smaller and paler, more brownish, in 

 color. In all these characters of form and proportion the species agrees 

 with M. sordidus and M. phceonotus, these three comprising a group by 

 themselves within the genus. 



Habits. — Myiarchus pelzelni is preeminently a species of the campos 

 region, instead of the deep forest. Mr. M. J. NicoU, who met with it on 

 Itaparica Island, near Bahia, says that it "was found singly or in pairs 

 among the clumps of mango-trees which grow in abundance in the open 

 glades of the forest. At a distance it is easily mistaken for M. ferox." 

 Prof. Barrows intimates that in Uruguay it is a migratory species; he speaks 

 of finding a "loose nest of hair, feathers, etc., in a hollow stub five feet from 

 the ground. It contained three eggs which in color and markings were 

 precisely like those of M. crinitus, but a little smaller. " A similar descrip- 

 tion is given by M. Venturi. 



Specimens examined. — Colombia: Florencia, Caqueta, 1. Peru: Chauil- 



lay, Urubamba Cafion, 1; unspecified, 1. Bolivia: Buenavista, 2; 



Cercado de Santa Cruz, 1; Rio Surutu, 3; Rio Dolores, 1; Todos Santos, 



1; Trinidad, Rio Mamore, 1. Argentina: Miraflores, 1; Rio Bermejo, 



Chaco Central, 1; Ocampo, 1; Barracas al Sur, 1; Formosa, 2; Las Talas, 1 ; 



Concepcion, Tucuman, 1; Victorica, 2. Uruguay: Concepcion, 3. Brazil: 



Chapada, Matto Grosso, 9; Tapirapoan, Matto Grosso, 1; Urucum, Matto 



Gross(^ 1; Bahia, 5; Santa Maria, Mexiana I., 1; Cachoeira, Rio Purus, 1. 



Total, 43. 



Myiarchus sordidus Todd. 



Myiarchus sordidus Todd, Proc. Biol. Soc. Washington, XXIX, 1916, 96 

 (El Trompillo, Carabobo, Venezuela; orig. descr.; type in coll. Carnegie 



Mus.). 



