f)40 



NOTES ON COSTA RICAN BIRDS. 



:l1 ' ' 50 posterior to nostril or frontal apex; crown ana occiputL 



asli gray, the feathers with distinct dusky shaft-streaks, this dull gral 

 color changing gradually into brownish olive-green on back and oi 

 upper parts, brightest on lesser wing-coverts, upper tail-coverts, and ta 

 auriculars olive yellow. Chin, throat, and chest, pure rich gambo* 

 yellow, becoming paler on other under parts, the sides brownish bu 

 and anal region pale buffy yellow. Upper mandible dusky brown, pal 

 on edge; lower mandible whitish, brownish at tip; legs and feet pa' 

 brownish. Length (skin), 4.90; wing, 2.30; tail (much worn at til 

 2.60; exposed culmen, .43; tarsus, .00; middle toe, .57. 



Young male (No. 2028, coll. Costa Rica National Museum, San Jos 

 Costa Rica, August 15, 1887; A. Alfaro).— Entire pileuin and hind nee 

 together with back, scapulars, rump, and upper tail-coverts, dull, rath, 

 light brownish olive, the back strongly washed with brown; lesser win 

 coverts, remiges, and rectrices yellowish olive-green; middle andgreati 

 coverts tipped with light yellowish olive. Sides of head nearly lil 

 pileum, the lores a little more dusky; chin, throat, and abdomen, pa 

 gamboge or primrose yellow (new feathers on throat brighter yellow 

 chest pale yellowish olive, deepening into a brownish tint on sides am 

 thinks. 



An adult male in the collection of the Costa Rica National Museui 

 (No. 2027, Los Anonas, August 15, 188 f, A. Alfaro) is essentiallv hk 

 that described above, though in more worn plumage. 



Petrochelidon lunifrons (Say). 



i 



An adult female from San Jose (No. 2314, coll. Costa Rica Nations 



Museum, September 3, 1888; A. Alfaro) is distinctly this species, as i 



also the only other example of the genus that I have seen from tha 



country, also an adult female (No. 08179, U. S. Nat, Mus., date and pre 



cise locality unknown).* Ou the other hand, all but one of the Nation* 



Museum specimens from Mexico (seven in number) are P. melanogaste 



Swains. (=P. swainsoni Sol.), which is distinguished chiefly by th. 



very different color of the forehead, which is of the same rich chestnu 



as the chin and sides of the head.t 



Buarremon crassirostris Cass. 



A fine adult of this rare species in the collection of the Costa Rics 

 National Museum (No. 1169, Rio Sucio, 1881; J. Cooper), closely resem 

 bles the type, but has the sides of the head rather blacker. It meas 

 ures as follows: Length (skin), G.35; wing, 3.15; tail, 2.70; exposed cul- 

 men, .o.,; tarsus, i.i.-, ; middle toe, .75. Upper mandible black, theedgf 



* I. belongs to the collection of ,h, , Ja ,,b Talamanca Expedition, th, collector 7 * 

 number being 218. 



J ^Au adult -male from Miradorin the National Museum collection (No. 33572, Angus*! 

 1863, Dr. C Sartor.™) is exactly intermediate between the two, and is probably I 

 ■'• v,,, '» ■ "'" forehead is of a very peculiar lighl brown hue, corresponding almost 

 exactly witL the "fawn color" of my "Nomenclature of Colors." 



