514 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



mandible brownish white or pale brownish buff (in dried skins); legs 

 and feet horn color (in dried skins). 



Yowig. — Very different in coloration from adults; pileum and nape 

 plain slatj' black; back and scapulars dusky, with large more or less 

 guttate spots of brownish buff or pale wood brown; rump and upper 

 tail-coverts plain light buff'y grayish brown; lighter bands of wings 

 and tail brownish biiff or pale wood brown instead of whitish; super- 

 ciliary stripe brownish buff, becoming very narrow (sometimes obso- 

 lete) anteriorly; throat, chest, and breast immaculate, the last two 

 strongly suffused with dull brownish buff; dusky bands on flanks and 

 under tail-coverts much less distinct than in adults. 



Adult m.ale.—'Le.xi.gih (skins), 181-193 (186.9); wings, 84-95 (91.5); 

 tail, 80-89 (85.5); exposed culmen, 19.5-25 (22.1); tarsus, 27-28.6 

 (27.4); middle toe, 16-19 (17.4)." 



Adult female.— 'L&Yigth.{s\ims), 171-187(179.5); wing, 83-89.6 (-85.9); 

 tail, 77-84.6 (78.9); exposed culmen, 18-20 (18.7); tarsus, 26-27.5 

 (26.7); middle toe, 16-17.6 (16.4)." 



Southwestern portion of Mexican plateau, in States of Morelos 

 (Huitzilac), Michoacan (Patamban), and Mexico (Rio Frio; Mount 

 Ixtaccihuatl; Ajusco; near City of Mexico). 



Campylorhynchus megalopterus Lafrbsnaye, Rev. Zool., viii, 1845, 339 (Mexico; 



type now in coll. Boston Soc. Nat. Hist.; see Eidgway, Proc. Bost. Soc. 



Nat. Hist., xxiii, 1888, 885).c— Des Murs, Icon. Om., 1845^9, pi. 54.— 



Bonaparte, Colisp. Av. i, 1850, 223. 

 Clampylorhynchus] megalopterus Gray, Gen. Birds, i, 1847, 159. 

 [Campylorhynchus] megalopterus Gray, Hand-list, i, 1869, 192, no. 2639. 

 Ileleodytes alticolus Nelson, Auk, xiv, Jan., 1897, 68 (Huitzilac, Morelos; coll. 



U. S. Nat. Mus.). 



HELEODYTES NELSON! Ridgway. 

 GBAY CACmS WREN. 



Similar to JT. inegaloptertiH^ but smaller, paler, and browner, with 

 spots on breast, etc., grayish brown instead of blackish. 



Adults {sexes aliJce). — Pileum light -grayish brown (broccoli brown 



« Nine specimens. 



'' Eight specimens. 



''At the time when I examined Lafresnaye's types of this species no other speci- 

 mens were extant, and the series of the allied form {H. nelsoni) was then too small 

 for satisfactory comparison. My conclusion that Lafresnaye's bird and that called 

 C. megalopterus by Dr. Sclater and others (later erroneously identified by Professor 

 Baird with C. pallescens Lafresnaye) represented the same species proves, in the light 

 of additional material, to have been a mistake. Mr. Nelson, recognizing the dis- 

 tinctness of the two forms, and accepting my identification of C. megalopterus with 

 the paler bird of the eastern side of the plateau, was thus unfortunately led to 

 describe the wrong bird as new, his Heleodytes alticolus and Lafresnaye's Campylo- 

 rhynchus megalopterus unquestion.ibly being the same form. 



