520 NOTES ON COSTA RICAN BIRDS CHERRIE. 



barred on the sides and flanks with blackish; also, as pointed ont by 

 Mr. Sharpe (Col. Birds Brit. Mns., vi, p. 217), the white on the throat 

 in Costa Eicau birds " is confined to the throat itself and not extend- 

 ing to the fore-neck." In the series before me there are no intermediate 

 or connecting forms. However, Nos. 4738C, 64697, and 116552, from 

 Costa Rica, and No. 91145, Los Sabalos, Nicaragna, in the U. S. 

 National Museum series, do present a few ill-defined blackish bars on 

 the flanks. The last specimen is a young bird with the under surface 

 slightly paler chestnut than in the adult. There is also a female ex- 

 amj)le in the Costa Kica National Museum collection (No. 3352, Jim- 

 enez, August 18, 1888), with a few blackish bars in the center of the 

 belly. 



Tliryophilus thoracicus. 



Out of a series of seventeen specimens examined, eleven from the U. 

 S. National Museum collection and six from the collection of the Costa 

 Rica National Museum, only one presented the upper tail-coverts 

 obscurely barred with blackish as indicated by Mr. Sharpe (Vol. vi. Cat. 

 Birds Brit. Mus., p. 215) ; with that one exception all have the upper 

 tail-coverts unicolored, without sign of bars. 



Tliryophilus niodestus. 



The throat and breast of young birds of this species are far more of 

 an ashy white than in the adult form ; and the sides, flanks, and cris- 

 sum area soft butf, much paler than in the adult. 



In a series of twenty-three Costa Rican birds no peculiarities are 

 noticeable that are not to be found in the Guatemala bird ; while no 

 intermediate forms are found grading into the Panama T. galbraitlii. 



For further notes on this species see the author's list of birds of San 

 Jose, Costa Rica, in The Auk, July, 1891, p. 275. 



Tliryophilus zeledoni. 



A comparison of seven of these birds with the series of twenty-three 

 T. modesfus from Costa Rica only goes to ]>oint out more conclusively 

 their specific distinctness. Not only is the great difference in size con- 

 stant, but also the color ; no intermediate birds are found. 



Thryopliilus seinibadius. 



Four specimens, two males and two females, from Pozo Azul, Costa 

 Rica (Nos. 919, 920, 921, and 922, Museo Nacional de Costa Rica), agree 

 very closely with the descriptions of the type specimen as given by 

 Mr. Shari)e, and also as given by Salvin and God man. Yet from the 

 material before me I conclude the description is drawn from a bird not 

 altogether mature. However, the type comes from Panama and the dif- 

 ferences pointed out below may be confined to a more northern race of 

 the bird. 



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