360 Annals of the Carnegie Museum. 



317. Myiozetetes cayanensis hellmayri Hartert and Goodson. 



Eleven specimens : Trojas de Cataca, Tucurinca, and Fundacion. 



The identification of these specimens has involved a comparative 

 study of the geographical variants of this species, the results of which 

 are briefly presented herewith. The typical form comes from Cay- 

 enne: it is a deeply colored bird, dark olive above, and with very little 

 (sometimes no) hazel on the outer webs of the remiges, while their 

 inner webs are margined with cinnamon or buffy. The rectrices like- 

 wise have little or no cinnamoneous edgings. In the Orinoco region 

 we find a form which is brighter, purer olive above, and with con- 

 siderably more rufescence on the wings and tail, both externally and 

 internally. For this form the name M. guianensis of Cabanis and 

 Heine (Museum Heineanum, II, 1859, 61) is probably available. It 

 is recognizably distinct from the northern Venezuelan form (M. caya- 

 nensis rufipennis Lawrence), in which its characters are carried to an 

 extreme. In rufipennis the hazel area on both webs of most of the 

 remiges reaches the shafts of the feathers ; the wing-coverts, lower 

 back, rump, and upper tail-coverts are also more rufescent ; and the 

 tail extensively so. 



In Colombian examples (including, besides those above listed, eight 

 specimens from other regions), however, we find a return to the char- 

 acters of typical cayanensis. There is a great reduction in the amount 

 of rufescence on the wings and tail as compared with guianensis, al- 

 though it averages rather more than in cayanensis. The form may 

 readily be distinguished from cayanensis by the much paler, greener 

 color of the upper parts, particularly evident in fresh specimens. It 

 is clearly entitled to the recognition recently accorded by Messrs. Hart- 

 ert and Goodson (Novitates Zoologiccc, XXIV, 1917, 412), whose 

 name is here adopted. 



A Tropical Zone form, but not noted except in the southwest part 

 of this region. Three birds were taken along the shore of the Cie- 

 naga Grande at Trojas de Cataca, two of them on some poles stuck 

 up in the water near a fisherman's hut, the third in a tree overhanging 

 the water. Later on a few additional examples were shot at Funda- 

 cion and Tucurinca. 



