BIEDS OF ARGENTINA, PARAGUAY, URUGUAY, AND CHILE 347 



of a covered passage at the hotel where I was stopping, and on the 

 following morning the male martin threw two young Passer doviesti- 

 cus from a nest near his chosen site, in spite of the protests of the 

 adult sparrows. As there were many o-penings suited for nesting 

 still unoccupied, this act must be attributed to a wanton meanness 

 of disposition. At Victorica, Pampa, the fork-tailed martin w^as 

 fairh^ common in town from December 23 to 29. The last seen 

 were three noted on March 31, 1921, as my train stopped at the sta- 

 tion of Monte Ralo, Cordoba. 



In general appearance, action, and calls, the male of this species 

 is similar to that of Progne subis, but is marked when on the wing 

 by its longer, more deeply forked tail. The female is entirely dark 

 underneath. 



Mr. Todd "° has called attention to the fact that Progne elegans 

 Baird (based on an immature male) is the same as P. furcata Baird, 

 the name current for this martin for many years, and must replace 

 it, as the name elegans occurs on an earlier page of the same work 

 in which Baird described furcata. 



Family TROGLODYTIDAE 



TROGLODYTES MUSCULUS MUSCULUS Naumann 



Troglodytes musculiis Naumann, Yog. Deutsclil., vol. 3, 1823, p. 724, 

 (Bahia.) 



The series of house wrens taken during my work in South America 

 has been studied by Chapman and Griscom during their revision of 

 Troglodytes musculus and identifications of siDecimens are theirs. 

 The only skin of typical musculus is an adult male taken at Kilo- 

 meter 80, west of Puerto Pinasco, Paraguay, on September 11, 1920. 

 The birds at that point were common at the borders of forest and 

 came familiarly about the ranch buildings, where they sang from 

 the doorAvays and searched for food among the split palm trunks that 

 formed the roofs. It is assumed that this form was the one recorded 

 on the Rio Paraguay, at Puerto Pinasco, and possibly the one seen 

 in the Chaco near Laguna Wall, 200 kilometers west. 



TROGLODYTES MUSCULUS REX (Berlepsch and Leverkuhn) 



Troglodytes furvus var. rex Berlepsch and Leverkuhn, Ornis, vol. 6, 

 1890, p. 6. (Samaipata, Bolivia.) 



A small series of wrens from the Chaco have been identified as 

 intermediate between rex and musculus, but nearer reje. These in- 

 clude the following localities: Resistencia, Chaco, July 9 and 10, 

 1920 (adult female taken) ; Las Palmas, Chaco, July 13 to 31 (two 



39 Auk. 1925, pp. 276-277. 



