168 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



three and one-third times as long as tarsus), much rounded (seventh to 

 fifth primaries longest, ninth shorter than second aries); primaries 

 exceeding secondaries by a little more than half the length of exposed 

 culmen. Tail nearly as long as wing, rounded, the rectrices moder- 

 ately broad, with rather pointed tips. Tarsus a little longer than 

 middle toe with claw; lateral claws reaching about to base of middle 

 claw; hind claw shorter than its digit. Occipital feathers very short. 



CiiJorntion. — Above plain dark grayish brown, beneath, together 

 with a shield-shaped patch covering crown and occiput, yellowish olive; 

 rest of head black, paling into grayish on throat. 



Range. — Costa Rica to western Ecuador. (Monotypic.) 



MITROSPINGUS CASSINI (Lawrence). 

 CASSIN'S TANAGER. 



Adniltx {sexes alil-e). — Occiput and median part of crown yellowish 

 olive-green, forming a triangular patch (with apex on anterior portion 

 of crown); forehead, lores, superciliary region, auricular region, part 

 of malar region, and chin grayish black; throat gray, sometimes tinged 

 with brownish; hindneck, back, scapulars, rump, upper tail-coverts 

 and lesser wing-coverts deep grayish olive, the hindneck more grayish, 

 the back and upper tail-coverts slightly tinged with olive-green; wings 

 and tail similar but slightly more brownish; under parts of body 

 bright yellowish olive-green, brightest or most yellowish on chest, 

 duller and more olive on sides and flanks; under tail-coverts russet- 

 olive, more or less tinged with tawny; under wing-coverts and axillars 

 light brownish gra}'; maxilla brownish black or blackish brown with 

 paler tomium; mandible wholly light colored; iris brown; ^ legs and 

 feet horn color (in dried skins). 



Young. — Much duller in color than the adult, with none of the yel- 

 lowish olive-green on top of the head, which is the same color as the 

 back, with a very faint tinge of olive on the occiput; breast and sides 

 merely tinged with olive-green, the middle line of the breast and belly 

 being dull brownish buflf, the under tail-coverts browner; forehead 

 and lores less black than in the adult. Otherwise the general colora- 

 tion is similar to that of the adult. 



Adult male.—Lewgth (skins), 167.6-172.T (170.9); wing, 8-2-85.1 

 (83.8); tail, 71.6-71.4 (73.4); exposed culmen, 17-18.5 (17.8); depth of 

 bill at base, 8.1-S.6 (8.4); tarsus, 24.4-25.1 (24.9); middle toe, 16.6- 

 17.3 (16.8).^ 



Adult female.— L&ngt]\ (skins), 162.6-172.7 (169.2); wing, 85.6-88.9 

 (86.9); tail, 75.2-78.2 (76.5); exposed culmen, 18-18.3; depth of bill 



'Heyde, manuscript. 



^Three specimens, all from lathmns of Panama. 



