374 BULLETIN 50, UNTTED STATES NATIONAL MUSETTM. 



and slender (two-fifths as long as wing), with transverse divisions of 

 acrotarsiuin obvious but not distinct; middle toe, without claw, 

 about half as long as tarsus, its basal phalanx wholly united to outer 

 toe, more than half united to inner toe; outer toe, without claw, 

 reaching decidedly beyond, the inner about to, middle of sub ter- 

 minal phalanx of middle toe; hallux about as long as inner toe but 

 decidedly stouter, its claw short'^.r than digit; all the claws moder- 

 ately curved, sharp, compressed. 



Coloration. — Above plain olive-green, the wings and tail dusky 

 with olive-green edgings, wing-coverts tipped with olive-yellowish 

 and tertials edged with same; beneath grayish white tinged with 

 ])ale yellow. 



Nidifieat'wn. — Nest "loosely constructed of dry grasses, leaves, 

 and rushes, with an entrance hole near the middle," "hanging four 

 feet above the surface of a pool of water, in deep woods along the 

 I'iver." Eggs white with reddish brown spots." 



7?fl?i(7^.-- Panama to Colombia. (Monotypic.) 



KEY TO THE SUBSPECIES OF ATALOTRICClfS PILARIS. 



a. Smaller (male averaging wing 41.5. tail 38.8); coloration lighter and l)righter, with 

 pileuni not darker than l^ack. (("olombia; Panama.) 



Atalotriccus pilaris pilaris (p. 374) 

 aa. Larger (adult male with wing 43.5, tail 39.5); edhiration darker and <hdler, with 

 pileum decidedly darker and duller than l)aek. (Venezuela.) 



Atalotriccus pilaris venezuelensis (extralimital; /> 



ATALOTRICCUS PILARIS PILARIS (Cabanis). 

 PYGMY FLYCATCHER. 



Adult male. — Above plain grayish olive-green, varying to some- 

 what buffy olive-green, the pileum sometimes very slightly duller; 

 wings and tail dusky with olive-green edgings, these broader and clear 

 sulphur yellow on inner secondaries, the middle and greater wing- 

 coverts tipped with sulphur yellow, forming two distinct thougli rather 

 narrow bands; sides of head(below eyes) and thence to and including 

 sides of breast light brownish gray; under parts dull white, passing 

 into sulphur yellow on flanks and imder tail-coverts, the axillars and 

 under wing-coverts also sulphur yellow; chin and upper throat nar- 

 rowly and indistinctly streaked with brownish gray, and chest faintly 

 tinged with the same; bill dusky horn color or brownish black, paler 

 basally and on toinia, the lower basal portion of mandible whitish 



oBerlepsch and Hartert, Novit. Zool., ix, 1902, 39. 



b Atalotriccus pilaris venezuelensis Ridgway, Proc. Biol. Soc. Wash., xix, 1906, 115 

 (San Antonio, Bermudez, Venezuela; coll. Am. Mus. N. H.). — Coloptenis pilaris 

 (not Colopterus pilaris Cabanis) Sclater and Salvin, Proc. Zool. Soc. Lond., 1869, 252 

 (Venezuela). — Colopteryx pilaris Berlepsch and Hartert, Novit. Zool., ix, 1902, 39 

 (Maipuras, Ciudad Bolivar, Altagracia, Caicara, etc., Venezuela; descr. nest and eggs). 



