150 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 



42. Chlorostilbon assimilis Lawr. 



Nine adults, both sexes, Sau Miguel and Saboga Islands, February, March, 

 and April. 



PICIDAB. 



43. Melanerpes seductus Bangs. 

 MelanerjKS seductus Bangs, Auk, vol. 18, pp. 26-27, January, 1901. 



Nine specimens, adults of both sexes, and one full-gro^vTi young male (March 

 11), San Miguel Island, February and March. 



The woodpecker of the Pearl Islands is a well-marked island form of M. 

 u-agleri, but whether its differences are better expressed by a binomial or a 

 trinomial is a question for some reviewer of the group to decide. 



FORMICARIIDAE. 

 44. Thamnophilus nigricristatus Lawk. 

 Eight adults, both sexes, San Miguel Island, February and March. 



45 Formicivora alticincta Bangs. 



Formicivora alticincta Bangs, Proc. New Eng. Zool. Club, vol. 3, p. 71, March 31, 

 1902. 



Thirteen specimens, adults of both sexes, and one young male, changing 

 from a dress similar to that of the female to that of the adult male. 



The adult males are similar to the two original specimens upon which this 

 very di.stinct island species was founded. The female was previously un- 

 known ; it differs from the female of F. intermedia Cab. in being darker, riclier 

 brown above, and much more extensively ochraceous below. In one specimen 

 the whole under parts, except throat and flanks, are of this color. It also 

 wholly lacks the black subapical spots on the feathers of the chest, which in 

 the female of F. intermedia form a sort of collar of semi-concealed spots. 



46. Cercomacra nigricans Scl. 



Cercomacra maculicaudis (Scl.) Bangs, Auk, vol. 18, p. .30, January, 1901. 



Eleven specimens, adults of both sexes, and one young male in transition 

 plumage, between that of the adult male and that similar to the female, San 

 Miguel Island, February and March. 



