BIEDS OF NORTH AND MIDDLE AMKRICA. 757 



and upper e3"elid pale dull buff or buffy olive; a triangular dusky loral 

 space and a less distinct (sometimes obsolete) dusky postocular spot or 

 streak; under parts pale buff, the abdomen (sometimes throat also) 

 nearly (sometimes quite) white, the sides and flanks buffy brown, the 

 latter more strongly suffused with l)uff; chest sometimes indistinctly 

 barred with pale olive; bill brownish black or blackish brown, the 

 mandible sometimes paler brown; iris dark brown;' legs and feet pale 

 horn brown (in dried skins). 



Adult ;//ff^./.— Length (skins), 119.5-124 (122.5); wing, 62-64 (63.1); 

 tail, 50-53.6 (51.3); exposed culmen, 11-13 (11.8); tarsus, 21-23 (22.4).' 



Adult female.— \^^\\^i\\ (skins), 119-122 (120.5); wing, 62; tail, 49-50 

 (49.5); exposed culmen, 11-12 (11.5); tarsus, 21-23 (22).'' 



Isthmus of Panama (south to Panama Railroad) and southwestern 

 Costa Kica (Rio Naranjo; Boruca; Buenos Aires). 



Basileuterus uropygiaUs (not of Sclater, 1864) Sclater and Salvin, Proe. Zool. 

 Soc. Lond., 1864, 347 (Panama R. R. )■ — Baird, Review Am. Birds, 1865, 

 246 (Panama R. R.).— Salvin, Proc. Zool. Soc. Lond., 1867, 136 (Santa Fe, 

 Veragua; crit. ); 1870, 183 (Bugaba, Veragua). 



[Baaileutemsl ((ro^>_//r/;a/(sScLATERand Salvin, Nom.Av. Neotr.,1873, 10 (Panama). 



Basileuterus semicermnus (not of Sclater) Lawrence, Ann. Lye;. N. Y., vii, 1861, 

 322 (Panama R. R.). 



Basileuterus leumpytjius (not of Sclater and Salvin) Salvin and Godman, Biol. 

 Centr.-Am., Aves, i, 1881, 172, part (Bugaba and Santa Fe, Veragua; Pan- 

 ama R. R. ). 



[Basileuterus leucopygins.'\ Subsp. ex. Basileuterus vera guensi s Sharpe, Cat. Birds 

 Brit. Mas., x, 1885, 403 (Paraiso Station, Panama R. R.; coll. Brit. Mus.). 



Basileuterus leucopygius reraguensis Bangs, Auk, viii, Oct., 1901, 368 (Divala, 

 Chiriqui); Proc. New Engl. Zool. Club, iii, 1902, 60 (Boquete, Chiriqui, 

 4,000 ft. alt.). 



Basileuterus veraguensis Ciierrie, Anal. Inst. Fis.-Geog. Nac. Costa Rica, vi, 1893, 

 12 (Rio Naranjo, s. w. Costa Rica; crit.; ha])its; song); Expl. Zool. Costa 

 Rica, i, Aves, 1893, 14 (Boruca and Buenos Aires, s. w. Costa Rica). 



BASILEUTERUS SEMICERVINUS LEUCOPYGIUS (Sclater and Salvin). 



COSTA RICAN BUFF-RUMPED WARBLER. 



Similar to B. s. veraguensis^ but buff of tail-coverts and basal portion 

 of tail paler (nearly cream buff), that of the tail more restricted (occu- 

 pying about the basal half, instead of basal two-thirds, and quite hid- 

 den l)y the coverts); under parts paler, largely white mediall}^, but 

 sides and flanks much darker buffy olive, and the chest (sometimes 

 breast also) spotted with pale olive. 



Adult male.— Length (skins), 132; wing, 63-64 (63.5); tail, 51-52 

 (51.5); exposed culmen, 11.5-12 (11.7); tarsus, 23.5-24 (23.7).* 



Adult female.—ljQngth (skins), 116-130 (121.7); wing, 60-63 (60.9); 

 tail, 48-50.5 (49.1); exposed culmen, 12-12.5 (12.2); tarsus, 20.5-23.5.' 



^ Heyde, manuscript. ^ Four specimens. * Two specimens. 



* Two specimens. '" Four specimens. 



