Todd-Carriker : Birds of Santa Marta Region, Colombia. 315 



remiges white or clouded with white. It appears, therefore, that this 

 species was based on a female example of a form which has no very 

 near relatives. Dr. Chapman and the writer, working independently 

 and with different material, have reached the same conclusion up to 

 this point, but specimens in the Carnegie Museum from the interior of 

 Colombia strongly indicate the existence of a different race in that 

 part of the country, which may or may not be typical nigriceps. In 

 the former case the present form would stand as T. nigriceps virgatus. 



Nos. 42,697, Fundacion, August 9, and 49,502, Tucurinca, September 

 23, illustrate the transition from the juvenal to the first winter plum- 

 age of the male bird. 



An abundant bird in the low heavy Tropical Zone forest lying be- 

 tween the edge of the foothills and the Cienaga Grande, at least from 

 Tucurinca on, its range doubtless extending as far north as Rio Frio 

 and out into the Magdalena basin. It frequents the dark cool depths 

 of the forest, where it roams about in pairs or in company with other 

 kinds, keeping low down in the undergrowth and shrubbery. 



266. Thamnophilus radiatus nigricristatus Lawrence. 



Thamnophilus radiatus (not of Vieillot) Sclater, Cat. Am. Birds, 1861, 175 



(" Santa Marta"). — Sclater and Salvin, Proc. Zool. Soc. London, 1864, 355 



(" Santa Marta "). 

 Thamnophilus nigricristatus Sclater, Cat. Birds Brit. Mus., XV, 1890, 209 



" Santa Marta "). 

 Thamnophilus doliatus (not Lanius doliatus Linnaeus) Allen, Bull. Am. Mus. 



Nat. Hist.. XIII, 1900, 161 (Bonda). 

 Thamnophilus radiatus nigricristatus? Ridgway, Bull. U. S. Nat. Mus., No. 50, 



V, 191 1, 37 ("Santa Marta"; meas. ; references). 



Seventeen specimens : Mamatoco, Fundacion, Dibulla, Tucurinca, 

 and Loma Larga. 



These agree closely with Lawrence's type in the collection of the 

 American Museum of Natural History. The range of this form in 

 Colombia is strictly confined to the coast region. Farther up the Mag- 

 dalena River, according to Dr. Chapman, it is replaced by T. radiatus 

 albicans, a much whiter form. 



Mr. Smith secured two specimens of this species, one from Mama- 

 toco (in the Carnegie Museum Collection), and another (a female) 

 from Bonda, the latter inadvertently identified by Dr. Allen as T. 

 doliatus. The writer has met with it only at Dibulla and Loma Larga 

 (one specimen each), Tucurinca, and Fundacion. In the last two 



