1904.] NATURAL SCIENCES OF PHILADELPHIA. 449 



c— Under parts lighter, more olivaceous; pileum and 



jugulum more distinctly striated . . iijrannina. 



c' . — Under parts darker, more rufescent; pileum and 



jugulum less distinctly striated . . . brunnea. 



a'.— Wing more than 135 mm macrorhijncha. 



B. — Wing not over 115 mm. 



a. — Outer webs of secondaries ta^\^l3^, in sharp contrast to the 

 dark brown upper wdng-coverts. 



6.— Darker anahatina. 



6'.— Paler tijphla. 



o! . — Outer webs of secondaries chestnut or olive-brown, not in 

 sharp contrast to the wing-coverts. 

 h. — Pileum with distinct pale buffy or ochraceous shaft stripes. 



c— Tail about equal to wing longicauda. 



c' . — Tail decidedly shorter than wing. 



d. — A conspicuous ochraceous postocular stripe; 

 exposed siu-face of wing-quills bright chestnut 



atrirostris. 

 d'. — No conspicuous ochraceous postocular stripe; 

 exposed sm-face of wing-quills oUvascent. 

 e. — Much more rufescent; throat and sides of 

 head darker ; shafts of rectrices brown 



turdina. 



e'. — Much more olivaceous ; throat and sides of 



head paler; shafts of retrices mostly 



black enalincia. 



^'' — Pileum without distinct pale buffy or ochraceous shaft 

 stripes. 

 c. — Pileum rufous-chestnut, decidedly contrasted with 

 * back. 



d. — Back and lower parts more olivaceous . ruficeps. 

 d'. — Back and lower parts more rufescent. 



e. — Smaller and paler .... iiomochroa. 



e'. — Larger and darker acedesta. 



c'. — Pileum concolor with back, or more olivaceous. 



d. — Exposed surface of secondaries decidedly less 

 rufescent than tail. 

 e. — Larger and much more rufescent . ridgwayi. 

 e' . — Smaller and much more olivaceous. 



/.—Darker olivacea. 



f • — Lighter lafresnayei. 



d'. — Exposed surface of secondaries not decidedly 

 less rufescent than tail. 

 e. — Feathers of throat with conspicuous pale 



shaft streaks fuliginosa. 



e'. — Feathers of throat T\ithout conspicuous pale 

 shaft streaks. 



. — Chin rufous or oUve-rufous, concolor 

 ■v\ith breast. 



