112 



BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



Adult female, — Length (skin), 216; wing, 119.5; tail, 93; exposed 

 culmen, 20.5; tarsus, 29.5; middle toe, 20." 



Northern and central Guatemala (Department of Vera Paz) to 

 central Costa Rica (Santa Maria) .^ 



Turdus leucauchen Sclater, Proc. Zool. Soc. Lond., 1858 (pub. 1859), 447 (Guate- 

 mala; coll. P. L. Sclater); 1859, 328 (monogi-.); Cat. Am. Birds, 1862, 3 

 (Guatemala). — Sclater and Salvin, Ibis, 1859, 6 (Guatemala); Proc. Zool. 

 Soc. Lond., 1870, 838 (Honduras).— Baird, Review Am. Birds, 1864, 24, 

 part (Choctum, Guatemala). — Seebohm, Cat. Birds Brit. Mus., v, 1881, 212 

 (n. e. Guatemala to Costa Rica). 



(?) Turdus leucauchen Salvin, Proc. Zool. Soc. Lond., 1867, 132 (Santa Fe and 

 Cordillera de Tole, Veragua; crit.) — Frantzius, Journ. fiir Orn., 1869, 290 

 (Costa Rica). — Boucard, Proc. Zool. Soc. Lond., 1878, 50 (Orosi, Costa Rica). 



Merula leucauchen Nelson, Auk, xv, Apr., 1898, 161, part (Guatemala). 



[Merula] leucauchen Sharpe, Hand-list, iv, 1903, 123. 



T[urdHs] leucauchen Sharpe, Bull. Brit. Orn. Club, no. 1, 1898, p. xxvi, part 

 (Chiapas to Panama); Ibis, 1898, 289, part (do.). 



[Planesticus] leucauchen Heine and Reichenow, Nom. Mus. Hein., 1890, 3 (Gua- 

 temala). 



(?) Turdus tristis (not Merula tristis Swainson) Salvin, Ibis, 1872. 314 (Choutales, 

 Nicaragua). — Sclater and Salvin, Proc. Zool. Soc. Lond., 1870, 838 (e. Hon- 

 "- duras; crit.). 



Turdus tristis Salvin and Goodman, Biol. Centr.-Am., Aves, i, 1879, 15, part 

 (Coban and Choctum, Guatemala; San Pedro, Honduras; etc.).c 



[Turdus] tristis Sclater and Salvin, Nom. Av. Neotr., 1873, 1, part. 



a One specimen, from Costa Rica. 



These compare in average measurements with Guatemalan specimens (not sexed) 

 as follows: 



b Owing to lack of a sufficient number of specimens with exact locality recorded 

 I am not able to define very exactly the respectives ranges of this form and P. t. 

 cnephosa. In a series of seven specimens fx'om Santa Maria, Costa Rica, there are 

 five P. t. leucauchen and two P. t. cnephosa. Santa Maria is on the western border of 

 the central plateau, near the head of a stream which flows into the Pacific. It is, 

 therefore, possible that the mingling of tlie two forms in the locality mentioned re- 

 sults from the intrusion along the valley of this stream by P. t. cnephosa from the west- 

 ward. 



c Examination of specimens from other localities cited would of course be necessary 

 to enable one to determine which form is represented in each. 



