BIRDS FROM BRAZIL AND SOUTHERN VENEZUELA—FRIEDMANN 527 
that these specimens have been identified. The nominate form has 
the ventral spotting less heavy than in the north Venezuelan form, 
brevipennis, and has the throat and chin unmarked and a slightly 
smaller bill. It occurs in the Orinoco Valley from Caicara to Ciudad 
Bolivar and the Cumana region. 
THRYOTHORUS LEUCOTIS HYPOLEUCUS (Berlepsch and Hartert): White-bellied Wren 
Thryophilus albipectus hypoleucus BeriEerscy and Harrert, Bull. Brit. Orn. 
Club, vol. 12, 1901, p. 12 (Altagracia, Rio Orinoco, Venezuela). 
SPECIMENS COLLECTED 
lim. 9, Venezuela, Ciudad Bolivar, November 27, 1929. 
lad. @, Venezuela, Soledad, Anzodtegui, June 12, 1931. 
The adult male was noted as having enlarged gonads. 
The young female is noticeably darker and more rufescent above 
than the adult male. 
This race occurs along the middle stretches of the Orinoco from the 
Apure River to Ciudad Bolivar. 
THRYOTHORUS LEUCOTIS ALBIPECTUS Cabanis: White-breasted Wren 
_Thryothorus albipectus CABANIS, i Schomburgk, Reisen in Britisch-Guiana . . o 
pt. 3, 1848 (=1849), p. 673 (Cayenne, French Guiana). 
SPECIMENS COLLECTED 
lad. &, lim. #, lim. 9,1im.-, Brazil, Providencia, Rio Negro, Amazonas, 
October 7, 1930. 
These four specimens, which by their identity of locality must be 
considered as of one form, bear out very well Hellmayr’s contention 
(Catalogue of the birds of the Americas, pt. 7, 1934, p. 161) that 
albipectus is an exceedingly unstable form. The unsexed immature 
bird is noticeably darker above and on the flanks, thighs, and under 
tail coverts than any of the other specimens; the immature female is 
buffier on the throat and breast than are the others. 
If Griscom and Greenway (Bull. Mus. Comp. Zool., vol. 88, No. 3, 
1941, p. 301) are correct in splitting albipectus, the present series 
would probably have to be called taeniopterus Ridgway (type locality, 
Diamantina, Santarém, Brazil). A female topotype of taemopterus 
agrees closely with the dark immature specimen of the present series. 
No topotypical albipectus have been seen. Gyldenstolpe (Kungl. 
Svenska Vet.-Akad. Handl., vol. 22, No. 3, 1945, Pp. 270) finds that 
material from Lower Amazonia indicates that neither color nor size 
characters appear to be valid for the recognition of taenvopterus. 
THRYOCTHORUS LEUCOTIS BOGOTENSIS (Hellmayr): Villavicencio Wren 
Throphilus albipectus bogotensis Hxeiimayr, Verh. zool.-bot. Ges. Wien, vol. 51, 
1901, pp. 770, 794: (“Bogota,” Colombia). 
