BIRDS 0^ NOBTH AND MIDDLE AMERICA. 



133 



space on sides of mandible, covering rami and projecting in an acute 

 angle more than halfway between gonydeal angle and tip of mandible; 

 iris brown; legs and feet bluish in life, dusky in dried skins; length 

 (skins), 109.2-129.5 (121.9); wing, 60.2-68.1 (64.3); tail, 51.3-68.4 

 (54.9); exposed culmen, 10.7-12.7 (12.2); depth of bill at base, 5.1-7.1 

 (5.8); tarsus, 16.6-17.8 (16.8); middle toe, 9.7-10.9 (10.4).' 



Adult female. — Above bright yellowish olive-green, darker and dul- 

 ler on pileum; sides of head (sometimes forehead and hindneck also) 

 gray, paler toward malar region and on lores; eyelids dull white; 

 chin and throat dull bufi'y white; rest of under parts gamboge or light 

 chrome yellow medially, shading into light yellowish olive-green lat- 

 erally; under wing-coverts white slightly tinged with yellow; axillars 

 light yellow; bill and feet as in adult male; length (skins), 114..3-121.9 

 (118.1); wing, 61-61.5 (61.2); tail, 50.8-52.8(51.8); exposed culmen, 

 12.7-13.2 (13); depth of bill at base, 5.8-6.9 (6.4); tarsus, 15.7-16.5 

 (16); middle toe, 9.7-10.2 (9.9.)' 



Immature male. — Similar to the adult female, but deeper and purer 

 yellow below; wing, 60.5; tail, 51.8; exposed culmen, 12.7; depth of 

 bill at base, 6.9; tarsus, 17.3; middle toe, 10.2." 

 Veragua* to Trinidad, Guiana, Bolivia, and western Ecuador. 

 T[achyphonus'] luctuosus Lafresnaye and D'Oreigny, Mag. de Zool., 1837 (Syn- 

 opsis Avium, i, p. 29; Guarayos, Bolivia). — Sclater and Salvin, Exotic 

 Orn., 1868,68. 

 Tachyphorms luctuosus Sclater, Proc. Zopl. Soc. Lond., 1854, 115 (Quixos, e. 

 Ecuador); 1855, 156 (Bogota, Colombia); 1856, 114 (monogr. ; Bolivia; e. 



' Seventeen specimens, average measurements, according to locality, being as follows : 



The series examined is much too small to show whether there are constant dif- 

 ferences, according to geographic area, but the specimens from Trinidad, British 

 Guiana, and lower Amazon have the middle wing-coverts decidedly less developed 

 (covering but little more than basal half of the greater coverts) than those from 

 Veragua, Isthmus of Panama, Colombia, and western Ecuador, and I would not be 

 surprised if a larger series would show that the species should be subdivided, accord- 

 ing to the character mentioned, into two forms having separate ranges, as indicated. 



^Two specimens; one from Panama, the other apparently a "Bogota" skin. 



'Specimen (No. 150874, U. S. Nat. Mua. ) from Cascajal, province Code, Panama. 



*Nicaraguan and Costa Rican references to T. luctuosus belong to T. axillaris. 



