1874.] 



MR. P. L. SCLATER ON THE GENUS SYNALLAXIS. 



27 



3. Synallaxis troglodytoides, D'Orb. Voy. Ois. p. 239. 



Hab. Bahia de San Bias, Patagonia (D'Orb.). 

 I have not been able to find any specimen of this species in the 

 Jardin des Plantes. 



4. Synallaxis striata, Ph. et Landb. Wiegm. Arch. 1863, 

 p. 119. 



Hab. Arica, Peru (Frobeen). 



I know of no species exactly resembling that here described. 



In conclusion I will offer a few remarks upon the geographical 

 distribution of the Synallaxes. 



The area occupied by this genus is nearly that of the whole Neo- 

 tropical region from southern Mexico to Patagonia. In Mexico and 

 Central America generally but one species is found, S. erythrothorax. 

 It is not until we get to Costa Rica and Veragua that we meet with 

 others, S. albescens and S. erythrops, intruders from the south, and 

 <S. rufiyenis, an apparently endemic species. In the Columbian and 

 Peruvian Andes Synallaxis appears to attain its greatest development, 

 as many as fourteen species occurring in Columbia, and ten or more 

 in Peru. In Guiana, Amazonia, Brazil, and eastern South America 

 generally they are more thinly scattered, each district only showing 

 about half that number of endemic species. In the southern part 

 of South America a set of species occur belonging to a section of 

 the twelve-tail-feathered division, which, in the northern part of the 

 continent, is only met with at a high elevation in the Andes. 



The subjoined Table will show the facts of distribution, so far as 

 they are hitherto known, at a glance. 



