BIEDS OF NORTH AND MIDDLE AMERICA. 241 



e. Posterior under parts obsoletely striped. (Nicaragua to northwestern Colom- 

 bia.) Xiphorhynchus lachrymosus lachrymosus (p. 242). 



cc. Posterior under parts distinctly striped with black and buff. (Southwestern 

 Costa Rica and western Panama.) 



Xiphorhynchus lachrymosus eximius (p. 243). 

 bb. Back brown, with streaks of buff margined with black (or with these streaks 

 obsolete). 

 c. Back conspicuously streaked; general color lighter and grayer. 

 d. Throat immaculate buff, or with dusky squamations on lower or middle por- 

 tion . ( Xiphorhynchiis Jiavigaster . ) 

 e. Darker and browner, the throat immaculate. (Eastern Mexico, except 

 Yucatan, to Nicaragua. ).Xipliorhynchus flavigaster flavigaster (p. 244). 

 ee. Paler and grayer, the lower throat usually scpiamated with grayish brown. 

 /. Lower throat squamated with grayish brown . 



g. Smaller; averaging, wing 114.4 in male, 106.1 in female; exposed cul- 

 men 40.4 in male, 39.7 in female. (Western Mexico.) 



Xiphorhynchus flavigaster mentalis (p. 247). 

 gg. Larger; averaging, wing 117.4 in male, 110.5 in female; exposed 

 culmen 43.2 in male, 42.2 in female. (Southwestern Mexico.) 



Xiphorhynchus flavigaster megarhynchus (p. 248). 

 ff. Throat immaculate. (Yucatan.) 



Xiphorhynchus flavigaster yucatanensis (p. 248). 

 dd. Throat conspicuously streaked with blackish. (Eastern Mexico.) 



Xiphorhynchus striatigularis (p. 249). 

 cc. Back obsoletely streaked (the streaks mostly confined to upper back); general 

 color darker and browner. {Xiphorhynchus ■nanus.) 

 d. Chin and throat deeper buff. 



c. General coloration slightly lighter. (Eastern Panama to Colombia.) 



Xiphorhynchus nanus nanus (p. 250). 

 ee. General coloration slightly darker. (Western Panamd to southern Hon- 

 duras.) Xiphorhynchus nanus costaricensis (p. 252). 



dd. Chin and throat paler buff or buffy white. (Northern Honduras and eastern 



Guatemala.) Xiphorhynchus nanus confinis (p. 253). 



aa. Under parts spotted with buffy. 



b. Pileum and back distinctly streaked (but streaks small). 

 c. Back rufescent brown; under parts browner. (Southeastern Mexico to Hon- 

 duras) Xiphorhynchus erythropygius (p. 254). 



cc. Back and under parts olive. (Colombia and Venezuela.) 



Xiphorhynchus triangularis (extralimital).a 



u Dendrocolaptes trianguJnris Lafresnaye, Rev. Zool., v. May, 1842, 134 ("Boli^^a"; 

 coll. Lafresnaye); Mag. de Zool., 1843, Ois., pi. 'i2.—Nasica triangularis Lafresnaye, 

 Rev. Zool., 1850, 418.— Dendrornis triangularis Sclater, Proc. Zool. Soc. Lond., 1855, 

 142 (Bogota, Colombia); 'Cat. Birds Brit. Mus., xv, 1890, Vi2.—I'icolaptcs triangularis 

 Eyton, Contr. Orn., 1852, 22. — Xiphorhynchus triangularis triangularis Oberholser, 

 Smithson. Misc. Coll., xlviii, pt. i, no. 1579, May 13, 1905, %?> .—D{endrornis] t[rian- 

 gularis] bogotcnsis Berlepsch and Stolzmann, Proc. Zool. Soc. Lond., 1896, 370, in 

 text. — Xiphorhynchus triangularis bogotcnsis Oberholser, Smithson. Misc. Coll., xhdii, 

 pt. 1, no. 1579, May 13, 1905, 63. 



The above'synonymy includes two or more subspecies, but the characters given in 

 the key are taken from Bogota specimens. Another name possibly pertaining to a 

 form of this species is Dcndrornis erythropygia sequatorialis Berlepsch and Taczanowski, 

 Proc. Zool. Soc. Lond., 1883, 563 (Chimbo, w. Ecuador); Dendrornis sequatorialis Sal- 

 vadori and Festa, Boll. Mus. Zool., etc., Torino, xv, 1899, no. 362, p. 25 (Foreste del 

 Rio Peripa, w. Ecuador; syn.; crit.); but this may be a form of X. pMnc%u/ttS. 



81255°— Bull. 50—11 16 



