B36 Zoological N. Y. Zoological Society. [1; IB 



Tyrannus tyrannus (Linn.). KINGBIRD. 



While there are few records of the occurrence of this spe- 

 cies in Costa Rica, Carriker^ says it is not uncommon there 

 as a winter visitor. 



On April 19th, we saw a flock of several hundreds of these 

 birds near Guapiles. Some small, winged insects of which we 

 could not secure a specimen, were swarming, and the Kingbirds 

 were dividing their attention between these and the small, pur- 

 plish berries of a nearby tree. For more than a week, the flock 

 stayed in the vicinity, feeding much on small fruits. They were 

 silent, even on the frequent occasion of clashes with other 

 flycatchers, especially Pitangiis and Myiozetetes, in which they 

 seemed well able to hold their own. 



Planesticus grayi casius (Bonap.). Bonaparte Tawny Robin. 



This bird certainly is the finest songster of the Caribbean 

 lowlands. It is abundant about Guapiles where its beautiful song 

 is a characteristic feature. It sings usually early in the morning 

 and late in the afternoon. During the breeding season, there 

 are few moments at these periods of the day when at least one 

 bird cannot be heard. 



We found many nests of this species, the first one on April 

 7th. The favorite site is in the fork of the trees composing 

 the "live fences." As the shoots grow up about the original 

 post, they form a perfect basket, with the top of the post for a 

 bottom. This soon becomes covered with mosses, lichens, and 

 various ferns and parasites, so that it is possible to hide a nest 

 perfectly. The nests are made of mud, moss and lichens, and 

 lined with rootlets. The five or six nests we found each con- 

 tained two eggs or young birds. The eggs are pale bluish, 

 heavily spotted with chestnut. 



Psilorhinus mexicanu8 cyanogenys (Sharpe). Central 

 American Brown Jay. 



This species was abundant in the more open parts of the 

 forest and about the potreros. It was seen almost invariably 

 in company with Gymnostinops montezumae, the two species 



'An Annotated T.ist of llui r.iids of CosLa Uica, including- Cucus Island, 

 p. 687. 



