1914] Crandall: Notes on Costa Rican Birds. 343 



tinguishable at a glance by this character alone. They were 

 lined with bits of long, narrow leaves, some still green, of a 

 different species from those used by Gymnostinops. They may 

 have possessed some quality unpleasant to bird lice, for while 

 the nests of Gymnostinops were infested with them, there were 

 none in those of the present species. 



Rhamphocoelus passe7-inii Bonap. Passerini Silver-Beak 



Tanager. 



The most casual traveler in Costa Rica cannot but be im- 

 pressed by the remarkable conspicuousness of this common 

 bird. It is abundant everywhere, and the flashing scarlet of its 

 lower back can be seen at a considerable distance. Very often 

 the wings are drawn down so that the red patch is exposed to 

 its fullest extent, and a more patent signal to passing birds of 

 prey could hardly be imagined. Its very evident success in life 

 can be explained only by. its habit of living in the vicinity of 

 thick bushes, into the depths of which it darts when danger 

 threatens. 



Arremonops conirostris richmondi Ridg. Richmond Sparrow. 



This is one of the most abundant birds about Guapiles. It 

 has a great variety of queer notes, its chug-chug-chug being 

 characteristic of the potreros. 



Nests were found frequently. They were placed close to 

 the ground in a clump of weeds or grasses, in open places. They 

 were built of coarse dried grasses and roots, domed, and with 

 the entrance at the side. One found on April 6 contained two 

 newly-hatched chicks, an unusually early date. The eggs are 

 plain white, usually four in number. 



