Basilenterus rufipons 119 Oct. 21 El Batel, 5100 feet, Sinaloa. A common species in thickets along streams and in forest openings. The song is strongly suggestive of that of Sparinus tristis. The call note is very much like that Zonotrichia leucophrys. The species occurs in small flocks which may represent family groups. They occur in habitat very similar to that occupied by the locally resident wren, except that this species avoids the dry brush piles which the wren appears to prefer; i.e., this species prefers greener brush thickets. In behavior, this Geothlypis species suggests more than any other I can think of.