120 



BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



PLANESTICUS GRAY! CASIUS (Bonaparte). 

 BONAPARTE'S THRUSH. 



Similar to P. g. grayi, but upper parts browner (warmer) olive; 

 under parts decidedly darker, duller, and more uniform (deep wood 

 brown or dull Isabella color), becoming buffy (deep buff) only on 

 throat and under tail-coverts: flanks much less rufescentj axillars 

 and under wing-coverts much less brightly colored, the dull brownish 

 ochraceous-buff or brownish buff of these parts not conspicuously 

 different from color of sides ; inner webs of remiges much less distinctly 

 edged with buflPy. Young duller in color than that of M. g. grayi, 

 especially under parts, which are less distinctly spotted. Size 

 slightly smaller. 



Adult male.— length (skins), 209.5-230 (219.3); wing, 111-126 

 (120.3); tail, 92-106.5 (97.8); exposed culmen, 20-22 (20.7); tarsus, 

 29-32 (30.7); middle toe, 19.5-22 (20.7). « 



Adult female.- I jencrth (skins), 213-250 (223.5); wing, 111.5-128 

 (119.1); tail, 90.5-105 (96.3); exposed culmen, 19.5-22.5 (20.8); 

 tarsus, 27.5-33.5 (30.5); middle toe, 19.5-22.5 (20.7).'^ 



Southeastern Honduras (Segovia River), through Nicaragua 

 (Greytown; Rio Escondido; Los Sabalos; Sucuya; Chontales) and 

 Costa Rica (San Jose; Barranca; Quebrada Honda; Lepanto; 

 Volcan de Miravalles; lia Palma de Nicoya; Pigres; Volcan de 

 Irazii; Coliblanco) to Panama (Loma del Leon; David; Santa Fe; 

 Volcan de Chiriqui ; Boquete; Divala). 



Planesticus casius Bon AF ARTE, Compt. Rend., xli, 1855, 657 (Panama; type in 

 coll. Brit. Mus.). 



Turdus casius Sclater, Proc. Zool. Soc. Lond., 1859, 330 (monogr.). — Law- 

 rence, Ann. Lye. N. Y., vii, 1862, 326 (Lion Hill, Panama R. R.).— 

 Seebohm, Cat. Birds Brit. Mus., v, 1881, 220 (Panama). 



a Sixteen specimens. 

 b Twenty-five specimens. 



Specimens from different geographic areas compare in average measurements as 

 follows: 



Locality. 



MALES. 



Two adult males from southern Honduras (Segovia River) . . 



One adult male from Nicaragua 



Three adult males from Costa Rica 



Ten adult males from Panama 



FEMALES. 



Two adult females from southern Honduras (Segovia River). 



Two adult females from Nicaragua 



Eleven adult females from Costa Rica 



Ten adult females from Panama 



Wing. 



118.2 

 124. 5 

 120.2 

 120. .■? 



121.7 

 128.7 

 120.3 

 119.2 



97 

 102 

 99.1 

 97.1 



100.7 

 104.7 

 95.8 

 96.9 



Middle 

 toe. 



20 

 22 

 21.8 

 20. 3 



20.5 

 22 

 21.1 

 20.3 



