BIEDS OF NOBTH AND MIDDLE AMEKICA. 579 



Genus AMAUROSPIZA Cataanis. 



Amaurospiza'- Oabanis, Journ. fiir Orn., ix, Jan., 1861, 3 (Type, A. concolor 

 Cabanis). 



Small unicolored Fringillidse apparentlj^ related to Cyaoiospiza, but 

 larger, the adult males plain slate-color or bluish slate or blackish (some- 

 times with white under wing-coverts and axillars). 



Bill short, broad, and deep, with culmen and maxillary tomium 

 arched; exposed culmen decidedly more than half as long as tarsus, 

 gently but decidedly and regularly convex; maxillary tomium decid- 

 edly arched or concave, though nearly straight for anterior half; 

 width of bill at base equal to or greater than its basal depth. Nostril 

 exposed, small, roundish. Rictal bristles weak. Wing rather long 

 (about three and one-third times as long as tarsus), rather pointed 

 (seventh primary longest, ninth much longer than secondaries). Tail 

 decidedly shoi'ter than wing, slightly rounded. Tarsus rather short 

 (about equal to middle toe with claw, or a little more). 



Coloration. — Adult males plain slate-graj^ or slate-bluish, usually 

 darker on head, in some species with under wing-coverts and axillars 

 white; adult females tawny brown above, paler (sometimes inclining 

 to buffy whitish) beneath. 



Range. — Costa Rica to Brazil and western Ecuador. 



AMAUROSPIZA CONCOLOR Cabanis. 

 CABANIS'S SEESEATER. 



Adult male. — Uniform dull indigo blue, appearing dull blackish 

 in certain lights, the blue most decided on lesser wing-coverts, the 

 under parts paler and grajj^er posteriorly; primaries dusky brownish, 

 edged with brownish gray; maxilla black, mandible paler (bluish in 

 life?); legs and feet brownish black, the claws and soles of toes yellow- 

 ish; wing, 59.69; tail, 53.34; exposed culmen, 12.70; depth of bill at 

 base, 7.62; tarsus, 17.78; middle toe, 11.13.^ 



Isthmus of Panama (Paraiso Station) to Costa Rica. 



Amaurospiza concolor Cabanis, Journ. fiir Orn., ix, Jan., 1861, 3 (Ooata Rica; 

 Berlin Mus.?).— La whence, Ann. Lye. N. Y., ix, 1868, 103 (Costa Eica).— 

 Feantzius, Journ. fiir Orn., 1869, 301 (Costa Rica).— Salvin, Ibis, 1869, 313 

 (Paraiso Station, Panama E. R. ). — Zelbdon, Cat. Aves de Costa Rica, 1882, 

 9; An. Mus. Nac. Costa Rica i, 1887, 111. — Salvin and Godmax, Biol. 

 Centr.-Am., Aves, i, 1885, 350 (Costa Rica; Chiriqui; Paraiso Station, Pan- 

 ama E. R.).— Shaepe, Cat. Birds Brit. Mus., xii, 1888, 156. 



[Amaurospiza] concolor Sclatee and Salvin, Nom. Av. Neotr., 1873, 28. 



'"Von afiavpoi, nicht hell, nicht glanzend, diister." 



^Described from a specimen in the Salvin-Godman collection, from Paraiso Station, 

 Panama R. R. (1867; Hughes). The wing is measured with primaries pressed flat 

 against the rule and the tail is measured from the base of the coccyx. 



