56 



Annals of the Carnegie Museum. 



be paid to zonal boundaries by these migrant birds. Of especial in- 

 terest in this connection, as suggesting how certain boreal forms may 

 have originally reached the Colombian highlands, may be cited the 

 finding of Geothlypis trichas trichas on the Paramo de Chiruqua, at an 

 elevation of 15,000 feet, on April 21, 1914. Not a few of the available 

 records indicate an earlier date of arrival in the fall and a later date 

 of departure in the spring than our experience in the north would 

 lead us to expect. For example, Tringa solitaria soUtaria has been 

 recorded in the fall migration as early as August 15 (1913), while 

 the latest date in the spring for Nuttallornis borealis is May 13, 1899. 

 The few species in the subjoined list which are queried may possibly 

 breed within the limits of the present region, but the evidence is not 

 conclusive. 



List of North American Migrants. 



( l)Ardea herodias subsp. Capella delicata 



( ?)Butorides virescens virescetis 



Buteo platypterus platypterus 



Falco peregrinus anatutn 



Falco columbarius columhar- 



( ?)Pandion halicetus carolinensis 

 Porzana Carolina 



(?)Chroicocephalus atricilla 

 Hydrochelidon nigra surina- 



mensis 

 Thalasseus maximus 

 Bartramia longicauda 

 Actitis macularia 

 Tringa solitaria solitaria 

 Neoglottis flavipes 

 Neoglottis melanoleuca 

 Pisobia minutilla 

 Pisobia maculata 

 Tryngites subruficollis 

 EreUnetes mauri 

 Ereunetes pusillus 

 Micropalama himantopus 



Charadrius semipalmatus 

 Coccysus americanus 

 Tyrannus curvirostris curvi- 



rostris 

 Tyrannus tyrannus 

 Myiarchus crinitus 

 Empidonax traillii brewsteri 

 Empidonax virescens 

 Myiochanes virens 

 Nuttallornis borealis 

 Hylocichla fuscescens fusces- 



cens 

 Hylocichla minima alicice 

 Hylocichla ustulata swainsoni 

 Lanivireo flavifrons 

 Vireosylva olivacea 

 Vireosylva flavoviridis flavo- 



viridis 

 Vireosylva calidris calidris 

 Vireosylva calidris barbatula 

 Hirundo rustica erythrogaster 

 Setophaga ruticilla 



