1917.] Chapman, Distribution of Bird-life in Colombia. 523 



was not fotind at San Antonio (alt. 6600 ft.), where Henicorhina leucophrys 

 guttata was common, but was evidently not uncommon at Las Lomitas, 

 since Richardson secured five specimens in a few days' collecting, and during 

 the same period took but one example of guttata. Bangs's type was taken 

 at Las Pavas, very near Las Lomitas, and at about the same altitude, while 

 his second specimen is labeled "near Jiminez, w. Colombia, alt. 2400 ft." 



With both these specimens and our own series before me, I am in a 

 position to throw some light on the relationships of this form. As Hellmayr 

 has already pointed out ' it is not a representative of the Guianan leucostida 

 but of the Mexican prostheleuca, though its comparatively white malar 

 region might easily lead to the belief that it was nearer the former. 



In general tone of coloration eucharis is indistinguishable from prosthe- 

 leuca; but the former has the malar and auricular regions less heavily marked 

 with black, the superciliaries more pronounced, the tertials less distinctly 

 barred, the greater and less wing-coverts without the white terminal spots, 

 which are present in most specimens (13 out of our 15 adults) of prostheleuca, 

 and it averages larger in size. These differences are slight and some speci- 

 mens of prostheleuca lacking the white spots on the wing-coverts, might 

 with difficulty be distinguished from specimens of eucharis. The close 

 resemblance of the two forms, however, is evidently not indicative of 

 correspondingly close relationships but is apparently to be attributed to 

 parallelism in development, since between them occurs a third race which 

 differs more from either than they do from each other. 



Henicorhina prostheleuca prosthelevxa (type-locality Cordova, Mexico) 

 ranges from southern Mexico to Nicaragua. Four specimens from Mexico, 

 two from Guatemala and eleven from Nicaragua agree, but the white spots 

 on the wing-coverts are larger in the Mexican birds. In Costa Rica, and 

 southward at least to Panama, prostheleuca is replaced by the well-marked 

 H. p. pittieri, of which I have eighteen specimens from Costa Rica (El 

 General and Boruca) and two from Panama, all but one loaned me by Mr. 

 Bangs. In this form the bright chestnut back and but slightly browner 

 (never blackish?) crown are more nearly as in inornata of the lowlands of 

 western Colombia than they are like those of prostheleuca or eucharis. 

 Some Costa Rica specimens, in fact, are exactly like examples of inornata 

 in the coloration of the upperparts, but the latter bird has more black in 

 the malar region, grayer sides and a larger bill, which, below,"" is basally 

 flesh-color. Panama specimens show no further approach toward inornata 

 but it is not improbable that intergrades between that form and pittieri 

 will be found in the Atrato region. 



1 p. Z. S., 1911, p. 1090. 



