672 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



hb. Darker; above dark sooty brown, under parts of body dark sooty brown lat- 

 erally, becoming dark chestnut medially. (Cauca Valley, Colombia.) 



Leucolepis dichrous (extraliniital)''' 

 aa. Remiges and rectrices distinctly barred with black. 



b. Auricular region chestnut, like throat and chest; no buffy or cinnamon stripe 

 along side of occiput and nape, 

 c. Forehead sooty or sepia brown, like rest of pileum; auricular region wholly 

 chestnut. 

 d. Under parts of body deep tawny-brown or chestnut-ljrown. 

 e. Darker; under parts of body deep chestnut-brown or nuimmy-brown; 

 back more chestnut-brown. (Western Ecuador. ) 



Leucolepis phaeocephalus (extralimital)^ 

 The U. S. National Museum possesses a specimen of this form from Guayaquil. 



ee. Paler; under parts of body. tawny-brown; back more olive-brown. (Cauca 

 Valley, northwestern Colombia. ) 



Leucolepis brunnescens (extralimital)<^ 



dd. Under parts of l)ody grayish brown, becoming deep brown on flanks. 



(Isthmus of Panama to southern Honduras. ) .Leucolepis lawrencii (p. 673) 



cc. Forehead chestnut; auricular region with a dusky-brown streak along upper 



margin. (Eastern Peru and adjacent parts of Bolivia. ) 



Leucolepis modulator (extralimital)'' 



bb. Auricular region brown, margined above by a broad stripe of cinnamon-buff. 



(Eastern Ecuador; eastern Peru ?) Leucolepis salvini (extralimital) <^ 



The forms characterized above fall into four groups, which probably 

 represent specific t^^pes, the others difl'ering- in minor particulars and 

 therefore doubtless representing geographic forms or subspecies. 



« Oyphorinus dichrous Sclater and Salvin, Proc. Zool. Soc. Lond., 1879, 492, pi. 41 

 (Remedios, Province of Antioquia, Colombia; coll. P. L. Sclater) ; Sharpe, Cat. Birds 

 Brit. Mus., vi, 1881, 294. 



I have not seen this form. 



^ Cyphorinus plueocephalus Sclater, Proc. Zool. Soc. Lond., 1860, 291 (Esmeraldas, 

 w. Ecuador; coll. P. L. Sclater); Sclater and Salvin, Exotic Orn., pi. 22; Sharpe, Cat. 

 Birds Brit. Mus., vi, 1881, 292. 



c Cyphorinus brunnescens Sharpe, Cat. Birds Brit. Mus., vi, 1881, 293 (Remedios, 

 Province of Antioquia, Colombia; coll. Salvin and Godman). 



This form I have not seen. One of the supposed characters given in the original 

 description fails in the light of a specimen of L. plueocephalus, from Guayaquil, which 

 has the primary coverts barred. The form seems to be a connectant between L. 

 phseocephalus and L. Icnvrencii. 



d Thryoihorus modulator D'Orbigny, Voy. Amer. Merid., Ois., 1839, 230 (Bolivia). — 

 Cyphorinus modulator Sclater, Proc. Zool. Soc. Lond., 1858, 63; Sharpe, Cat. Birds 

 Brit. Mus., vi, 1881, 291, pi. 18, fig. 2. — Sarochalinus rufogularis Des Murs, in Castel- 

 nau's Voy., 1855, 49, pi. 17, fig. 2. 



This form I have not seen. 



'^Cyphorinus salvini Sharpe,.Cat. Birds Brit. Mus., vi, 1881, 292, pi. 18, fig. 1 (Rio 

 Napo, e. Ecuador; coll. Brit. Mus.). 



The U. S. National Museum possesses the skin of a young but full-grown bird from 

 the headwaters of the Huallaga River, eastern Peru, which seems to be referable to 

 this species, having the brown auriculars and conspicuous buffy stripe along side of 

 occiput and nape, as described and figured by Sharpe. Without comparison with a 

 young example of L. salvini, however, the identification is uncertain. 



