BIRDS OF NORTH AND MIDDLE AMERICA. 241 
c. Posterior under parts obsoletely striped. (Nicaragua to northwestern Colom- 
bla paveemeas a's signet Xiphorhynchus lachrymosus lachrymosus (p. 242). 
‘ec. Posterior under parts distinctly striped with black and buff. (Southwestern 
Costa Rica and western Panamé.) 
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. (X«phorhynchus flavigaster.) 
e. Darker and browner, the throat immaculate. (Eastern Mexico, except 
Yucatan, to Nicaragua.).Xiphorhynchus flavigaster flavigaster (p. 244). 
ee. Paler and grayer, the lower throat usually squamated with grayish brown. 
J. 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 fiavigaster megarhynchus (p. 248). 
Jif. Throat immaculate. (Yucatan.) 
: Xiphorhynchus flavigaster yucatanensis (p. 248). 
dd. Throat conspicuously streaked with blackish. (Eastern Mexico.) 
Xiphorhynchus striatigularis (p. 249). 
ce. Back obsoletely streaked (the streaks mostly confined to upper back); general 
color darker and browner. (Xtphorhynchus nanus.) 
d, Chin and throat deeper buff. 
e. General coloration slightly lighter. (Eastern Panam4 to Colombia.) 
Xiphorhynchus nanus nanus (p. 250). 
ee. General coloration slightly darker. (Western Panamé to southern Hon- 
AUTAS:) sana uacincteialy 3 Xiphorhynchus nanus costaricensis (p. 252). 
dd. Chin and throat paler buff or buffy white. (Northern Honduras and eastern 
Guatemala.)............22220-204 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- 
UPS)! ane stcecanermemtiiee toe tees Xiphorhynchus erythropygius (p. 254). 
ec. Back and under parts olive. (Colombia and Venezuela.) 
Xiphorhynchus triangularis (extralimital).« 
@ Dendrocolaptes triangularis Lafresnaye, Rev. Zool., v, May, 1842, 134 (“ Bolivia’; 
coll. Lafresnaye); Mag. de Zool., 1848, Ois., pl. 32.—Nasica triangularis Lafresnaye, 
Rev. Zool., 1850, 418.—Dendrornis triangularis Sclater, Proc. Zool. Soc. Lond., 1855, 
142 (Bogota, Colombia); Cat. Birds Brit. Mus., xv, 1890, 132.—Picolaptes triangularis 
Eyton, Contr. Orn., 1852, 22.—Xiphorhynchus triangularis triangularis Oberholser, 
Smithson. Misc. Coll., xlviii, pt. i, no. 1579, May 18, 1905, 63.—D[endrornis] ¢t[rian- 
gularis] bogotensis Berlepsch and Stolzmann, Proc. Zool. Soc. Lond., 1896, 376, in 
text.— Xiphorhynchus triangularis bogotensis Oberholser, Smithson. Misc. Coll., xlviii, 
pt. i, no. 1579, May 13, 1905, 63. 
The above synonymy includes two or more subspecies, but the characters given in 
the key are taken from Bogot4 specimens. Another name possibly pertaining to a 
form of this species is Dendrornis erythropygia xquatorialis Berlepsch and Taczanowski, 
Proc. Zool. Soc. Lond., 1883, 563 (Chimbo, w. Ecuadér); Dendrornis xquatorialis Sal- 
vadori and Festa, Boll. Mus. Zool., etc., Torino, xv, 1899, no. 362, p. 25 (Foreste del 
Rio Peripa, w. Ecuadér; syn.; crit.); but this may be a form of X. punctigulus. 
81255°—Bull. 50—11——16 
