It is with some diffidence I include this genus in the Troglodytidae. Its bill, short rounded wing, long legs and large feet all point to a position in this family, whilst the character of its habits and nidification confirms the classification. On the other hand, the presence of rictal bristles might induce some ornithologists to place the genus in a family by itself, leading from the Troglodytidae to the Short-winged Chats, Brachy pterygium.
In Tesia the bill is equal to or rather more than half the length of the head, broad at the base and compressed at the tip. The wings are very short and rounded, the tail so short as to be invisible and the tarsi and feet very long. The male and female are alike but the young differ considerably from the adult though they are not spotted or barred as in the Shortwings or paler than the adult as in Timaliidae.
Key to Species.
A. Crown golden-brown T. cyaniventer, p. 463.
B. Crown bright chestnut T. castaneocoronata, p. 465.