Todd — Studies in the Tyrannidce. 189 



Siibspecific characters. — Similar to Pipromorpha assimilis assimilis, but 

 slightly smaller (except the bill); upper parts averaging slightly brighter 

 green; and under parts darker and more uniform; the throat with less 

 grayish and more greenish tinge, the posterior under parts duller, less 

 buffy — olive lake tinged medially with mustard yellow. 



Measurements.— Male: wing, 60-66 (63); tail, 46-53 (48.5); bill, 11.5-13 

 (12.2); tarsus, 14-16 (14.8). Female: wing, 57-63 (59); tail, 41-49 (44); 

 bill, 11.5-13 (12.3); tarsus, 13.5-15.5 (14.7). 



Range. — Pacific slope of Costa Rica to western Panama, in the Tropical 

 Zone. 



Remarks. — It is interesting to find that the authors who first had to do 

 with specimens of this group from western Panama (or Veragua, as it was 

 then called) were all careful to refer them to the South American form, and 

 not to that of southern Mexico, which Sclater had already discriminated 

 in 1857. In 1888 we find Salvin and Godman arguing against the recogni- 

 tion of a northern race, assimilis, on the ground of inter gradation. There 

 was thus good reason for suspecting the existence of more than one form 

 north of Panama, and Mr. Bangs in 1901, with a good series of specimens 

 at his command, was enabled to point out characters for separating them. 

 We fully agree with this author in according specific rank to P. assimilis, 

 since there is no evidence of intergradation between its southern race, 

 P. assimilis dyscola, on the one hand and P. oleaginea parca on the other. 

 Later Mr. Bangs undertook to show that dyscola was the form occupying 

 the Pacific slope of Costa Rica, while the Carribbean slope was occupied by 

 assimilis, more or less typical, and after examining the same material we 

 indorse this conclusion also. A specimen from Miravalles (No. 27,219, 

 Collection Carnegie Museum) appears to be intermediate, indicating that 

 intergradation takes place in this region. 



Twenty out of seventy-three specimens have the outer primary percepti- 

 bly but not decidedly emarginate at the tip. No. 17,817, Collection E. A. 

 and O. Bangs, Boruca, Costa Rica, June 5, is the youngest bird in the series, 

 with short tail. It resembles the adult, but is notably darker and duller. 

 Several other fully grown birds from other localities agree with it in these 

 respects and are obviously young in juvenal dress. 



Specimens examined.— Panama: Divala, 6. Costa Rica: Pozo Azul de 

 Pirris, 8; Miravalles, 1; El Pozo de Terraba, 2; Boruca, 24; Paso Real, 4; 

 Pozo del Pital, 2; Buenos Aires, 4; Barranco, 3; Pozo del Rio Grande, 4; 

 El General, 15. Total, 73. 



Pipromorpha assimilis assimilis (Sclater). 



Mionectes oleaginus (not Muscicapa oleaginea Lichtenstein) Sclater, Proc. 

 Zool. Soc. London, "1856," 1857, 296 (Cordova, Vera Cruz, Mexico).— 

 BoucARD, Ann. Soc. Linn. Lyon, n. s., XXV, 1878, 50 (Guatemala). 



Mionectes assimilis Sclater, Proc. Zool. Soc. London, 1859, 45 (range), 46 

 (Cordova, Mexico [type-locality]; Guatemala; orig. descr.; type now in 

 coll. Brit.*Mus.),366 (Jalapa, Vera Cruz, Mexico). — Sclater and Salvin, 

 Ibis, 1859, 124 (Sclater's record). — Sclater, Ibis, 1859, 445 (Cordova, 



