FAMILY TYRANNIDAE 547 



growing on soil supported by a large rock, separated from the shore 

 by a meter and a half of swift-flowing water. The small, compact, 

 thick-walled cup rested on a sloping branch, with three leafy twigs 

 built into its sides as support. It was composed mainly of green moss, 

 held by long, slender fibers running through it so that it was firm and 

 closely knit. The soft lining was of downy feathers of the domestic 

 fowl, readily available at nearby houses. In external measurements 

 the nest was approximately 90 by 70 mm, and 60 mm high, with the 

 cup 40 mm deep. It held a single egg, well along in incubation, pale 

 dull buff in color, so fragile that it could not be measured. Nearby I 

 saw another nest, similar in construction but empty, placed in a low 

 shrub standing in the water at the edge of the stream. 



In the collections of the British Museum (Natural History) I have 

 seen a set of two eggs of the very slightly larger Serpophaga cinerea 

 cinerea, collected by T. K. Salmon, at Envigado, Antioquia, Colombia, 

 that are similar to those of the race of western Panama. The two are 

 rather dull buffy white, subelliptical in form, and measure 16.4 X 12.6 

 and 16.4 X 12.1 mm. 



Smith (cit. supra, pp. 259-286) in a detailed analysis of the 

 Serpophagine group of flycatchers describes the northern race and 

 nominate cinerea in Ecuador as closely similar in details of general 

 behavior. In figure 3, line 2, of this reference he illustrates a vocaliza- 

 tion record made in Panama that he indicated as "the most complex 

 units" found. 



PHAEOMYIAS MURINA EREMONOMA Wetmore: Mouse- 

 colored Tyrannulet, Moscareta Pardusca 



Phaeomyias mnrina crcnwnoma Wetmore, Smithsonian Misc. Coll., vol. 122, 

 no. 8, December 17, 1953, p. 7. (Rio Santa Maria, north of Paris, Province 

 of Herrera, Panama.) 



Small ; grayish brown above ; breast grayish, abdomen yellowish 

 white ; light line above eye. 



Description. — Length 105-115 mm. Adult (sexes alike), above 

 with crown, back, and sides of head dull drab-brown ; rump and upper 

 tail coverts faintly browner ; superciliary and lower eyelids dull white ; 

 lores light grayish olive ; wings dull hair brown ; lesser wing coverts 

 edged, and middle and greater wing coverts tipped, with dull buff; 

 secondary borders usually paler, whiter ; tail dull hair brown, with 

 outer webs and tip dull olive-buff ; throat and f oreneck dull white ; 

 upper breast and sides pale, dull gray ; lower breast and abdomen 

 pale yellow ; under tail coverts somewhat whiter ; tibia drab-brown. 



