BIRDS OF NORTH AND MIDDLE AMERICA. 579 



Genus AMAUROSPIZA Cabanis. 



Amaurospiza^ Cabanis, Jourii. fi'ir Oru., ix, Jan., 1861, 3 (Type, A. coiicolor 

 Cabanis). 



Small uuicolored Fringillidte apparently related to Cyanospiza^ 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- 

 edl}^ arched or concave, though nearly straight for anterior half; 

 width of l)ill 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 

 decidedl}^ shorter than wing, slightly rounded. Tarsus rather short 

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



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

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

 white; adidt females tawny brown al)ove, paler (sometimes inclining 

 to buHy 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 grayer posteriorly; primaries dusk}" 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, 11.43.' 



Isthmus of Panama (Paraiso Station) to Costa Rica. 



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

 Berlin Mus.?).— Lawrence, Ann. Lye. N. Y., ix, 1868, 103 (Costa Rica).— 

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

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

 9; An. Mus. Nac. Ccsta Rica i, 1887, 111.— Salvin and Godman, Biol. 

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

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



lAynaurospizal concolor Sclater and Salvin, Nom. Av. Neotr., 1873, 28. 



^"Von djiiavpo';, 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. 



