BIRDS OF NORTH AND MIDDLE AMERICA. 519 



Haplospiza ; the first with two species: Acanthidojjs hairdu of the 

 Costa Rican highlands, and Acanthido2)s uniformis, of southeastern 

 Mexico. A case of somewhat anomalous geographical distribution 

 would thereb}" be satisfactorily disposed of. 



ACANTHIDOPS BAIRDl Ridgway. 

 PEG-BILLED SPARROW. 



Adult male. — Above, including lesser wing-coverts, plain dark slate- 

 color,^ rather paler on rump and upper tail-coverts; wings slate-black- 

 ish, with slat}" edgings, these palest and most distinct on greater 

 coverts; under parts slate-color, paling into slate-gra}" on abdomen, 

 anal region, and under tail-coverts, the latter margined with light 

 fulvous; maxilla l)rownish black, paler along tomium; mandible light 

 colored, becoming dusk}' terminally; legs and feet horn brownish; 

 length (skin), 142.24; wing, 67.82; tail, 55.88; exposed culmen, 13.21; 

 depth of bill at base, 6.35: tarsus, 21.59: middle toe, 14.73.^ 



Adidt {I) fernah:-. — Above plain olive, slightly paler on rump and 

 upper tail-coverts: wings dusky, the middle and greater covei ts rather 

 broadly tipped with ochraceous-bufi'. producing two distinct bands; 

 tertials rather broadly edged with dull tawny, secondaries edged with 

 brownish olive, and primaries edged with light grayish olive; tail gray- 

 ish dusky, with edges of rectrices indistinctly paler olive-grayish; an 

 indistinct but rather broad superciliary stripe; malar region and sides 

 of neck dull olive-bufl'y or pale butiy olive; lores and auricular region 

 dusky olive; chin, throat, and chest pale grayish olive, tinged with 

 buff, and indistinctly streaked with darker; remaining under parts 

 more buff'y (the abdomen, anal region, and under tail-coverts almost 

 wholly dull l)uffy). becoming more brownish on fianks; bill, legs, and 

 feet as in adult male: length (skin), 12!:>..54: wing, 63.50; tail, 52.07; 

 exposed culmen, 13.21; tarsus, 20.32; middle toe, 14.73.* 



Immature malt. — Similar to the adult {i) female, but larger; length 

 (skin), 129.54; wing, 66.55; tail. 53.85; exposed culmen, 12.70; depth 

 of bill at base, ^.>^&\ tarsus, 21.08; middle toe, 14.73. * 



Highlands of Costa Kica (Volcan de Irazu. Volcan de Poas, San 

 Jose, etc.). 



Acanthidops bairdl Ridgway, Proc. U. S. Xat. 3Ius., iv, sig. 21, Mar. 10, 1882, 

 336 (Volcan de Irazu, Costa Eica; U. S. Nat. Mus.); vi, 1884,414;^ xi, 1888, 

 196 (degcr. adult male, from El Alto Vok-an de Poay, Costa Rica). — Sclater, 

 Ibis, 1884, 241.— Salvix and Godmax, Biol. Centr.-Am., Aves, i, 1886, 434.— 

 Zeledox, An. Mus. Nac. Costa Rica, i, 1887, 112. — Sharpe, Cat. Birds Brit. 

 Mus., xii, 1888, 234. 



^ Between blackii;h slate and slate-black of Ridgway's Nomenclature of Colors. 

 -'No. 114907, U. S. Nat. Mus., Alto, Volcan de Poas, July 27, 1888; A. Alfaro. 

 *Type; no. 85549, U. S. Nat. Mus.. Volcan de Irazii, Oct. 10, 1880; Juan Cooper. 

 *No. 91979, r. S. Nat. Mus., San Jose, Aug. 5, 1883; J. C. Zeledon. 

 ^ Specific name should have been credited in original description to ]Mr. Jose C. 

 Zeledon, for whom the author described the species. 



