56 



Annals of the Carnegie Museum. 



be paid to zonal boundaries by tbese 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 solitaria has been 

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

 the latest date in the spring for Nuttallornis borcalis 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. 



( ?)Ardea herodias subsp. 



(?)Bntorides virescens virescens 

 Butco platyptcrus flatypterus 

 Falco peregrinus anatum 

 Falco colnmbarius columbar- 

 ius 



(?)Pandion halicctus carolincnsis 

 Porzana Carolina 



( ?)Chroicocephalus atricilla 



Hydrochelidon nigra surina- 



mensis 

 Thalasseus maximus 

 Bartramia longicauda 

 A ctitis m acidar ia 

 Tringa solitaria solitaria 

 Neoglottis flat'ipes 

 Neoglottis mclanolcuca 

 Pisobia minutilla 

 Pisobia maculata 

 Tryngites subruficollis 

 Ereunetes manri 

 Ercunctes pusillus 

 Micropalama himantopus 



Capclla dclicata 

 Charadrius semipalmatus 

 Coccyzus amcricanus 

 Tyrannus curvirostris cnrvi- 



rostris 

 Tyrannus tyrannus 

 Myiarchns crinitus 

 Empidonax traillii brewstcri 

 Empidonax virescens 

 Myiochanes virens 

 Nuttallornis borealis 

 Hylocichla fusccscens fusces- 



cens 

 Hylocichla minima alicicc 

 Hylocichla nstulata siuainsoni 

 Lanivireo flavifrons 

 Vireosylva olh'acca 

 Vireosylva flavoviridis flavo- 



viridis 

 Vireosylva calidris calidris 

 Vireosylva calidris barbatula 

 Hirundo rustica crythrogaster 

 Sctophaga ruticilla 



