212 Proceedings of the Biological Society of Washington. 



London, 1911, 1137, in text, part (crit.)- — Hellmayr, Abhand. Bayer- 

 ischen Akad. Wiss., Math.-phys. KL, XXVI, 1912, 90 (Igarap6-Assu, 

 Pard, Brazil).— Beebe, Zoologica, II, 1916, 64, 90 (Para, Brazil; habits). 



Myiarchus tuberculifer tricolor von Berlepsch, Ornis, XIV, 1907, 477 (in 

 list of species). 



Myiarchus tuberculifer tuberculifer Hellmayr, Nov. ZooL, XVII, 1910, 302 

 (Marmellos and Borba, Brazil). 



Subspecific characters. — Similar to Myiarchus tuberculifer tuberculifer, 

 but general coloration duller, the upper parts plain olive, becoming deeper 

 (near olivaceous black No. 1 of Ridgway) on the pileum, which is therefore 

 less strongly contrasted with the back; and gray of throat and breast 

 deeper (pale neutral gray). 



Measurements. — Male (seven specimens): wing, 79-83 (81); tail, 67-74 

 (71); bill, 16-18 (17); tarsus, 18-19 (18.5). Female: wing, 72-76 (74); 

 tail, 65-70 (67); bill, 15-17 (16); tarsus, 17-19 (18). 



Range. — From French Guiana southward through Brazil at least to Rio 

 Janeiro, and westward for an indeterminate distance. 



Remarks. — This form is based on specimens from Rio Janeiro, from 

 which unfortunately no topotypical specimens are available at this writing. 

 Mr. Hellmayr, however, has critically examined the types in the Vienna 

 Museum, and finds them practically the same as specimens of tuberculifer 

 from other parts, being merely a little smaller. He is very doubtful of 

 the propriety of recognizing tricolor as a subspecies, but with the fresh ma- 

 terial from the lower Amazon Valley now in hand we have no difficulty in 

 separating it by the comparative characters specified above. There is one 

 specimen in the collection of the Goeldi Museum (No. 1296) marked as 

 agreeing with the type of tricolor (except for the wing-coverts being a little 

 lighter), so that we feel fairly safe in referring the whole series examined 

 to this form. None of those measured run as small as the types, but this 

 may be due to the possibly more worn condition of the latter, only birds 

 in fresh plumage having been measured in our own series. It is not at all 

 surprising that the type-specimens fail to show the differential color-char- 

 acters of the form, since these require a series in order to bring them out 

 clearly, and the types may have faded considerably in the hundred years 

 since they were collected. French Guiana birds vary slightly in the di- 

 rection of tuberculifer, but are best referred here; British Guiana speci- 

 mens, however, are difficult to place. The present race varies from the 

 typical form in an opposite direction from nigriceps. 



Specimens examined. — French Guiana: Mana, 5; Pied Saut, 2. Brazil: 

 Oncoupi Island, 1; Benevides, 2; Santarem, 7; Colonia do Mojuy, 3; Villa 

 Braga, 4; Itaituba, 2; Obidos, 6; Pedroira, Pard, 1; Marco da Legua, Pard, 

 1; Utinga, Para, 1; "Insel im Rio Iriri, " 1; Boim, Rio Tapajoz, 1; Faro, 

 Rio Jamunda, 2; Chapeu Virado, Mosqueiro, 1. Total, 50. 



Myiarchus tuberculifer tuberculifer D'Orbigny and Lafresnaye. 



Tyrannus tuberculifer D'Orbigny and Lafresnaye, Mag. de Zool., 1837, 

 Synopsis Avium, 43 (Guarayos, Bolivia; orig. descr.; type in coll. Paris 



