668 Annals of the Carnegie Museum. 



Bangs Collection : Pozo Azul de Pirris, Bolson, Juan Vinas (Under- 

 wood). 

 Carnegie Museum : Guacimo, Miravalles, Pozo Azul de Pirris, Boruca, 

 Buenos Aires, El Pozo de Terraba (Carriker). Eighteen skins. 

 In working over a very large series of skins of Pachyrhamphus 

 polychropterus\ am not able to separate the birds from t the eastern and 

 western slopes of Costa Rica as Mr. Ridgway has done. It is true 

 there are some very slight differences between the birds from the 

 Terraba Valley and those from northwestern and eastern Costa Rica, 

 but they seem to me to be altogether too unstable to serve even as 

 subspecific characters. I have examined all the material available, 

 including skins from eastern Nicaragua, which would certainly exhibit 

 the characters pointed out by Mr. Ridgway, if the race were separable. 

 There are great differences in the shade of color on the underparts 

 among birds taken in the same place (due to age, the old birds being 

 darker), several skins from Terraba being as dark if not darker than 

 birds from the Caribbean slope, supposed to be the dark form, similis ; 

 neither does the character of greater and lesser extent of gray on the 

 rump and lower back hold good, because here again we find skins from 

 the same place exhibiting all gradations in the extent of the gray area, 

 while there are specimens from Boruca which exhibit the black streak- 

 ing on the upper tail coverts, one of the main characters of the so-called 

 P. p. similis, so that I have, after taking these facts into consideration, 

 placed all Costa Rican references and specimens under P. p. cinerei- 

 ventris. 



This bird is found in most abundance on the Pacific slope, from sea- 

 level up to 2,000 feet, while a few birds are found on the Caribbean 

 slope at the same altitudes. They frequent trees along streams, open 

 woodland, and scattered trees in pastures. They are usually seen in 

 small flocks, although single birds or pairs are not infrequently en- 

 countered. They, like all the cotingas, are largely fruit-eaters. 



413. Lathria uniruf a clara Ridgway. 



Lalhria uniruf a Sclater and Salvin, P. Z. S., 1879, 518 (Remedios, Antioquia, 

 Colombia). — Zeledon, An. Mus. Nac. de C. R., I, 1887, 118 (Pacuare). — 

 Sclater, Cat. Birds Brit. Mus., XIV, 1888, 353, part (no C. R. records). — 

 Salvin and Godman, Biol. Centr.-Am., Aves, II, 1891, 129, part (no C. R. 

 references). — Cherrie, Expl. Zool. en C. R., 1890-1, 1893, 37 (Lagarto 

 and Boruca, four specimens). 



Lathria unirufa clara Ridgway, Proc. Biol. Soc. Wash , XIX, 1906, 120 (Pan- 



