NOVITATES ZOOLOGICAE XXIV. 1917. 497 



Bogota collections, differs in both sexes by the much paler underside and middle 

 of abdomen more or less white. 



We have examined the following material in the Tring Museum besides 

 that of the British Museum : 



T. p. punclaius : 24 So, 19 ??• 

 T. p. inter positus : 4 cJ<J, 5 ??. 

 T. p. atrinucha : 16 ^(J, 9 ??. 

 T. albiventris : 8 (J<J, 11 $?. 



On the subspecies of Thamnophilus doliatus. 



Th. doliatus doliatus (L.) (terra typica substit. Surinam !) i^ the darkest of 

 all the South American forms of this species. 



Distribution : Surinam, Cayenne, and parts of British Guiana. 



Th. doliatus fraterculus Berlp. and Hart, (terra typica Altagracia on the 

 Orinoco !). Cf. Nov. Zool. 1902, p. 70. 



Distribution : Orinoco region, Trinidad. Specimens from Merida and the 

 Tachira district seem to us to be absolutely indistinguishable from fraterculus. 

 Todd (Proc. Biol. Soc. Washington xxvi. 1913, p. 172) described a male from 

 Tocuyo, collected by Carriker, as Th. dol. heteroleucxis ; he says that it is \\'hiter 

 than fraterculus. No mention is made of the size of wing or bill, nor is the female 

 described ! Two males from San Esteban near Puerto Cabello are indistinguish- 

 able from fraterculus. We are, therefore, afraid that heteroleucus will be a 

 synonym of the latter. 



Th. doliatus tobagensis subsp. nov., Tobago Island. 



Very near to fraterculus. In the male the whole underside is generally a 

 little more whitish, the throat distinctly more white, the black spots mostly smaller 

 and broken up, not in lines as in fraterculus. Sides of head distinctly more 

 white. $ paler underneath, especially on the throat, which is quite unspotted. 

 3 wing 73-82, $ 73-78 mm. 



Type : o ad., Plymouth, Tobago Island, 23. iv. 1903. Collected by Pasea, 

 one of Andre's collectors. 



Th. doliatus catus Bangs (terra typica Margherita Island). 



We have only one S from Margherita Island, collected by Lt. W. Robinson, 

 and 9 males and 14 females from Cumana, which agree perfectly with the Marghe- 

 rita form. The bills of these birds are distinctly smaller than those of fraterculus 

 and tohagensis. The underside of the males is lOie that of tohagensis, but the 

 throat marked as in fraterculus. The females are very similar to those of 

 tohagensis, but the throat is more or less spotted as in a Margherita female in 

 the British Museum. Wings <? 70-75, 5 70-72 mm. The measurements given 

 by Bangs for catus must be too small, for even if the wing is not stretched on the 

 ruler, our Margherita male has a wing of fully 70 mm., and in no form of doliatus 

 is the female larger than the male. The one Margherita female we have seen 

 has a wing of 70 mm. 



Th. doliatus suhradiatus Berlp. (terra typica Yquitos, Upper Amazonia). 

 The males differ from the former subspecies by having the crown mixed with less 

 white, and sometimes without any white, and the females are deeper rufous. 

 (Th. variegaticeps Berl. and Stolzm., Proc. Zool. Soc. London 1896, p. 379, from 

 Central Peru, La Merced, is evidently indistinguishable from suhradiatus.) 



