( 230 ) 



lepachi), 1 ? imm. from Bartica Grove; 1 aJ. Great Falls ; 1 Camacabra Creek ; 

 4 Superuaam ; 4 Itnribisce ; 8 cT ? Rorairaa ; 1 ? ail. Camacusa ; 1 cJ vix ad. 

 R. Cariniang. 



Specimens from different localities average as follows : 



Six males from the coast district 



(Bartica, etc.) .... Wing 00-03 ; tail 5G-58 ; bill I.J-IG mm. 

 Two males from the mountains (Cari- 



mang, Roraima) .... AVing 01 ; tail 59, 62 ; bill 1.5, 10 mm. 

 Six females from the coast district . Wing 57-59 ; tail 53-50 ; bill 15-10 mm. 

 Six females from the mountains 



(Camacusa, Roraima) . . . Wing 55-57 ; tail 52-57 ; bill 15 mm. 



Observations. — Messrs. Brabonrnc and Chubb, in the pii|)c'r (luolcd above, 

 distinguish three races as occurring in British Guiana uiidor tlie names of 

 T. coraija corai/a (Rorairaa), T. c. hcilrpsrhi (Bartica Grove), and 7'. oyapocensis 

 itaribiaciensis (Ituribisce district). Mr. F. V. MiConnell very kindly forwarded 

 for my inspection his entire series of Wrens which had formed the basis of their 

 conclusions. This material, supplemented by the specimens in the Munich, Tring 

 and Berlepscli Collections, and including the types of 7". ridgivayi, T. berlepscki, and 

 T. 0, ituribiscii'Ktiis 1 have carefully studied, with the result that I find there exists in 

 British Guiana but one form, which is entitled to the name 7'. r. i/riseiyulu (Lawr.). 



Let us first consider the inhabitants of the lowland districts, which, according 

 to Brabonrnc and Cluibb, are referable to two races, one with dull fulvous nnder- 

 f&rta {T. c. bt'rlejjsc/ii), the other with greyish middle line (7'. o. itiiribisciemis). 

 On comparing fifteen s])ccimens I notice tliat three from Bartica Grove 

 (including tlic types of 7'. ridywaiji and 7". bciiepschi), and an adult male from 

 Supernaam are much the darkest, the under parts posterior to the white throat and 

 foreueck being nearly uniform bright tawny ochraceons. Then follow two skins 

 from the "'Great Falls" and Camacabra Creek with a somewhat duller, more 

 brownish ucliraceous belly, which in the last-named bird passes into a paler, more 

 brownish buff tinge along the middle line. Next come two males from Ituribisce 

 (one the type of T. o. ituribisciensis) in which the nnder parts are mainly buffy brown, 

 darkening to oehreous brown on the flanks. An adnlt bird from Su[)ernaam is 

 closely similar, but tlie middle of tlie abdomen is rather more greyisli brown and 

 the sides are decidedly darker. Finally, two males (adult and immature) from 

 Supernaam and Ituribisce are even more greyish in the middle, and, except for the 

 slightly darker sides, they are not distinguishable from average Cayenne s])ecimens, 

 i.e. jf. c. rorai/a. From the above, it will be seen that the variation is purely 

 individual and nut connected with any particular geographic area. It should also 

 be borne in mind that the Ituribisce is in the same district as the Supernaam, both 

 rivers draining their waters through the jjlains into St. James' Canal (month of 

 the Essequibo). The conditions for the development of a peculiar form are, therefore, 

 hardly given. 



Messrs. Brabourue and Chubb, furthermore, consider the birds from the moun- 

 taiuons interior (Roraima) to be distinguishable by their lighter " chestnut " back 

 and brighter fulvous nnderparts. The majority of my skins from the mountains 

 are indeed of a clearer ochraceons beneath, but several are not different from the 

 type of T. r/dffwai/i (ex Bartica Grove), whereas a male from the Carimaug River 

 (Roraima district), in the dull ochreous-brown belly, exactly matches some of the 



