BIRD LIFE IN THE XJRUBAMBA VAIJ:,EY OF PERU. 79 



(1825) SCYTALOPUS MICROPTERUS BOLIVIANLS Allen. 



Scytalopus bolivianus Allen, Bull. Amer. Mus. Nat. Hist., vol. 2, 1889, p. 98 

 (Reyes, Bolivia). 



Comparison of the type of this form with a large series from Colom- 

 bia shows that it differs only in being smaller. The type is not sexcd, 

 but is apparently a male, being dark slate with a silvery white crown- 

 patch, only the posterior parts of the body being brown. It measm^es : 

 Wing, 50; tail, 34; tarsus, 22 ; culmen, 12 mm. An average Colombian 

 male measures: Wing, 61; tail, 43; tarsus, 24; culmen, 13.5. 



Idma, female juv. 



Family FORMICARIIDAE. 



ANT BIRDS. 



(1876) THAMNOPHILUS MELANOCHROUS Sclater and Salvin. 



Thamnophilus melanochrous Sclater and Salvin, Proc. Zool. Soc, 1876, p. 18,. 

 pi. 3 (Huiro, Peru). — Berlepsch and Stolzmann, Ornis, 1906, p. 93 (Idma). 



With the exception of one from Santa Ana, our specimens are from 

 the Subtropical Zone. They are all essentially topotypical. 



Santa Ana, 1 female; Idma, 4 males, 4 females; San Miguel Bridge,. 

 6 males, 7 females; Torontoy, 3 males, 2 females. 



(1912) THAMNOPHILUS RADIATUS SUBRADIATUS Berlepsch. 



Thamnophilus subradiatus Berlepsch, Journ. ftir Ornith., 1887, p. 17 (Upper 



Amazonia). 

 Thamnophilus radiatus Sclater and Salvin, Proc. Zool. Soc, 1876, p. 16 (Huiro; 



Maranura). 

 Thamnophilus nigricristatus subradiatus Berlepsch and Stolzmann, Ornis, 1906, 



p. 93 (Santa Ana). 



I follow Berlepsch in referring Santa Ana specimens to this form 

 and Ridgway in ranking subradiatus as a race of radiatus. 



Santa Ana, 2 males, 1 female; Chauillay, 1 female; San Miguel 

 Bridge, 1 male. 



(1936) DYSITHAMNUS OLIVACEUS (Tschudi). 



Thamnophilus oUvaceus Tschudi, Faun. Per., 1844, p. 174, pi. 11, fig. 1 (Central 



Peru). 

 Dysithamnus olivaceus Berlepsch and Stolzmann, Ornis, 1906, p. 93 (Sant? 



Ana; Idma). 



(1999) HERPSILOCHMUS MOTACILLOIDES Taczanowski. 



Herpsilochmv^ motacilloides Taczanowski, Proc. Zool. Soc, 1874, p. ISPv^aJ^ay- 

 nioc).— Berlepsch and Stolzmann, Omis, 1906, p. 94 (Idma). 



Three specimens, collected and sexed by the WTiter confirm 

 Berlepsch's statement that Taczanowski described as a -^»^e either 

 a young male or female. The sexual differences are ^^^h' given 

 by Berlepsch.^^ I have seen no other specimens. 



Idma, 1 male, 2 females. 



'« Proc. Zool. Soc, 1896, p. 381. 



