198 Mr. A. H. Holland on the Birds of the 



20. Passer domesticus (Linn.). 



The Common House-Sparrow of Great Britain has been 

 introduced into Argentina and is occasionally met with. 



21. Sycalis LUTEOLA (Sparrm.) . 



Very common throughout the year^ flocks in the winter 

 months. Breeds late in November, and soars immediately 

 before nesting. It has a melodious song, though feeble. 

 Nest composed of hay, grass, feathers, and lined with horse- 

 hair, placed under grass on the ground. Eggs five in 

 number. 



22. MOLOTHRUS BONARIENSIS (Gm.). 



Very common throughout the year, in flocks in summer and 

 winter, and does not appear to pair for breeding. The 

 females lay their eggs from September to January in any 

 small bird^s nest that they can find. The eggs vary from 

 pure white to nearly pure red, with intermediate varieties 

 and differently spotted markings. The native name is 

 *'Pajaro Negro. ^' 



23. MoLOTHRUS RUFO-AXILLARIS, Cassiu. 



Rather rare, apparently migrating for the winter. Breeds 

 late in November in the usurped nests of Ammiblus acuticau- 

 datus, where Molothrus badius also makes its abode. Eggs 

 six in number. 



24. Molothrus badius, Vieill. 



Fairly common all the year, pairs in the spring, but flocks 

 in the winter. Breeds throughout November in the disused 

 nests of Anumbius acuticaudatus, but makes its own entrance 

 to these nests, instead of using the one already constructed. 

 Eggs five in number. 



25. Agel^us thiltus (MoL). 



Fairly common throughout the year, flocks in the winter. 

 Breeds late in October, either in the tall paja-grass or amongst 

 reeds in lagoons. Eggs four in number. 



26. Leistes superciliaris (Bp.). , 

 Comn^on throughout the year, flocking in the winter 



months. Breeds early in November, and makes its nest on 



