BIRDS OF NORTH AND MIDDLE AMERICA. 519 



Haplosfiza; the first with two species : Acanthidops lairdi, of the 

 Costa Rican highlands, and Acanthidops uniformls, of southeastern 

 Mexico. A case of somewhat anomalous geographical distribution 

 would thereby be satisfactorily disposed of. 



ACANTHIDOPS BAIRDI Ridgway. 

 PEG-BILLED SPAKROW. 



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

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

 ish, with slaty edgings, these palest and most distinct on greater 

 coverts; under parts slate-color, paling into slate-gray on abdomen, 

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

 fulvous; maxilla brownish black, paler along tomium; mandible light 

 coloi'ed, becoming dusky 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.' 



Adult (V) female. — Above plain olive, slightly paler on rump and 

 upper tail-coverts; wings dusky, the middle and greater coveits rather 

 broadlj^ tipped with ochraceous-buff, 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-buffy or pale buffy 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 buffy (the abdomen, anal region, and under tail-coverts almost 

 wholly dull buffy), becoming more brownish on flanks; bill, legs, and 

 feet as in adult male; length (skin), 129.54; wing, 63.50; tail, 52.07; 

 exposed culmen, 13.21; tarsus, 20.32; middle toe, 14.78.^ 



Immature male. — Similar to the adult (?) female, but larger; length 

 (skin), 129.54; wing, 66.55; tail, 53.86; exposed culmen, 12.70; depth 

 of bill at base, 6.86; tarsus, 21.08; middle toe, 14.73. * 



Highlands of Costa Rica (Volcan de Irazu, Volcan de Poas, San 

 Jose, etc.). 



Acanthidops bairdi Eidgway, Proc. U. S. Nat. Mus., iv, sig. 21, Mar. 10, 1882, 

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

 196 (descr. adult male, from El Alto Volcan de Potls, Costa Rica). — Sclatep, 

 Ibis, 1884, 241.— Salvin and Godman, Biol. Centr.-Am., Aves, i, 1886, 434.— 

 •Zeledon, An. Mua. Nac. Costa Rica, i, 1887, 112. — Shakpe, Cat. Bird$ Brit. 

 Mus., xii, 1888, 234. 



^Between blackish slate and Slate-black of Ridgway'a Nomenclature of Colors. 

 2 No. 114907, U. S. Nat. Mus., Alto, Volcan de Pods, July 27, 1888; A. Alfaro. 

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

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

 * Specific name should have been credited in original description to ilr. Jose C. 

 Zeledon, for whom the author described the species. 



