632 Annals of the Carnegie Museum. 



e. Back and chest grayish-sooty; chestnut on wing not con- 

 fined to coverts, (juv. without chestnut crown). 



Synallaxis pudica. 

 ee. Back and flanks grayish buff-brown; belly and throat white; 

 chestnut on wings confined to coverts. 



Synallaxis albescens latitabunda. 

 cc. Wing- coverts not bright chestnut. 



d. Small (wing 60 mm.); tail part black and part cinnamon-rufous; 

 rump cinnamon; ridge of maxilla straight, mandible curving 

 upward. Xenops genibarbis mexicanus. 



dd. Larger (wing 85 mm.); deep olive-brown above; ochraceous 

 olive-brown below; throat plain buff-ochraceous, unmarked. 

 e. Smaller and paler (wing 83 mm.; tail 75 mm.); Pacific 

 lowlands. Automolus pallidigularis exsertus. 



ee. Larger and darker (wing 90 mm.; tail 80 mm.); Carribean 

 lowlands. Automolus cervinigularis hypophceus. 



aa. Either spotted, streaked, barred or vermiculated above or below or both above 

 and below. 

 b. Tail stiff and harsh, shafts thickened and curving downward, or if not very 

 stiff, rectrices very acuminate or sharpened shafts protruding beyond 

 end of feather. 

 c. Lower parts decidedly barred (at least on abdomen), or else streaked, 

 and size large (wing 130 mm.). 

 d. Barred below. 



e. Entire under parts as well as pileum and back more or less 

 barred with black in wavy lines. 

 /. Largei ; barring heavier and bars wider, veiy pronounced 

 on back (wing 130; tail 134 mm.). 



Dendrocolaptes sancti-thomce sancti-thomce. 

 ff. Smaller; bars narrow, obsolete on back (wing 118; tail 

 115 mm.). 



Dendrocolaptes sancti-thomce hcsperius. 

 ee. Only abdomen and under tail-coverts barred with black; 

 throat and chest streaked with buffy- white; pileum and 

 nape with buffy shaft-lines. 



Dendrocolaptes validus costaticensis. 

 dd. Streaked below, size large; ruddy brown above and below; sides 

 of head, throat, and breast streaked with buffy-white; chin 

 and upper throat buffy-white. 



Xiphocolaptes emig^ans costaricensis. 

 cc. Lower parts streaked or mottled* but not barred. 

 d. Bill long (50 mm.) and much decurved. 



Campylovhamphus pusillus borealis. 

 dd. Bill ordinary; not more than 35 mm. long. 



e. Pileum unmarked (sometimes small obsolete shaft-spots). 

 /. Small (wing 77 mm.). 



g. Bill wedge-shaped (mandible sloping upward); 



