168 BTTLLETIN 50, T^NITED STATES NATIONAL MTtSEUM. 



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

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

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

 cuhnen. Fail nearly as long as wing, rounded, the rectrices moder- 

 atel}' l)road, 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 ver}- short. 



Coloration. — Above plain dark grayish l)rown, beneath, together 

 with a shield-shaped patch covering crown and occiput, j^ellowish olive; 

 rest of head black, paling into grayish on throat. 



Range. — Costa Rica to western P^cuador. (Monotypic.) 



MITROSPINGUS CASSINI (Lawrence). 

 CASSINS TANAGER. 



Adultx (.s'rtmv allh^.- — Occiput and median jmrt 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 ])lack; throat gra}*, 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 hut slightlv more l)rownish; under parts of bod}" 

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

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

 olive, more or less tinged with tawny; under wing-coverts an<l axillars 

 light broAvnish gray; maxilla brownish black or blackish brown with 

 paler tomium; mandible wholly light colored; iris ])rown;' 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 ])elly 

 being dull ])r()wiiish bull', the luider tail-coverts ])rownei"; forehead 

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

 tion is similar to that of the adult. 



Adult ///</A.— Length (skins), 107.6-172.7 (170.1)); wing, 82-85.1 

 (83.8); tail, 71. ()-74.-l: (73.1); exposed culmen, lT-18.5 (17.8); depth of 

 bill at base, 8.1-8.0 (8.1); tarsi s, 21.1-25.1 (21.9); middle toe. 16.5- 

 17.3 (16.8).' 



Ail ult ftniale.—'Low^^ih (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 



'Heyile, luaauscript. 



'^ Three specimens, all from istlimns of Panama. 



