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In Passer, Estrilda and Poephila, and in all the cardueline finches examined, the bellies of the m. flexor perforans et perforatus digiti II and the m. flexor perforans et perforatus digiti III are more intimately connected than they are in the other species studied.

Yet, in Leucosticte, a cardueline, and in Calcarius, an emberizine, whose foraging habits are rather similar, the structure is unlike.

Passer, Estrilda, and Poephila, and in all the cardueline finches examined the proximal portion of this muscle is more intimately connected with the anterior edge of the m. flexor perforans et perforatus digiti II than it is in the other species examined.

The muscle does not seem to be so well developed in the cardueline finches as it is in the other species.

In the ploceids and cardueline finches this muscle is undivided and resembles in its position, origin, and insertion only the ventral portion of the muscle found in the other birds studied.