Carriker : List of the Birds of Costa Rica. 791 



Stelgidopleryx serripennis salvini Ridgway, Birds N. and Mid. Amer., Ill, 1904, 

 Addenda, p. 739 (crit.). 



In Mr. Bangs' collection are two birds of this race from Chiriqui, 

 but I have seen none from Costa Rica. It seems to me that the real status 

 of this form is not quite clear, and that additional material may throw- 

 more light on the Central American forms of the genus as a whole. As it 

 is now, the synonymy seems to be rather involved, and there is no means 

 of making it clear without seeing many of the specimens referred to by 

 various authors. 



583. Stelgidopteryx serripennis serripennis (Audubon). 



Hirundo serripennis Audubon, Orn. Biog., IV, 1838, 593 (Charleston, South 

 Carolina; type in the U. S. Nat. Museum). 



Stelgidopteryx serripennis Baird, Rept. Pacific Railway Surv., IX, 1858, 312; 

 Review Am. Birds, 1865, 314 (Angostura, June, 1864 [Carmiol]). — Salvin 

 and Godman, Biol. Centr.-Am., Aves, I, 1883, 237, part (Costa Rica). — 

 Sharpe, Cat. Birds Brit. Mus., X, 1885, 206, 636, part (Costa Rica). — 

 Ridgway, Birds N. and Mid. Am., Ill, 1904, 58 (temperate N. Amer., south 

 in winter through Mexico and Central America to Costa Rica). 



(?) Stelgidopteryx fulvipennis Boucard, P. Z. S., 1878, 67 (San Jose, March to 

 May). 



Bangs Collection: Juan Vinas, March 10 to May 12; Pozo Azul de Pirris, 



May 17 (Underwood). 

 C. H. Lankester Collection: Cachi. 

 Carnegie Museum: Juan Vinas, Mar. 19 and April 18; Miravalles, May 



28 and June 9 (Carriker). Four skins. 



It is clearly evident that many individuals of this species which are 

 found in Costa Rica are only winter migrants, but it is equally clear that 

 the bird breeds there and is resident the year round. I found quite a 

 colony of the birds nesting along the road between Guaitil and Sabanilla 

 de Pirris in May, 1902, and caught a female on the nest. This bird was 

 a perfectly typical specimen of S. s. serripennis, without a trace of the 

 rufous on the throat as found in S. s. salvini. 



There is every shade of intergradation between true serripennis and 

 salvini, and in some instances there are even traces of the black spot on 

 the under tail-coverts as found in S. ruficollis uropygialis, there being a 

 skin in Mr. Bangs' collection from Texolo, V. C, Mexico, with a large 

 sooty spot on the tips of the coverts, and one skin from Juan Vinas, Costa 

 Rica, with a trace of the same. 



