Leptopaecile Severtz., Turkest. Jevotn., p. 66 (187«). Type, L. sophiae Severtz.
The genus contains one lovely species, which extends from Turkestan to Western China.
In Leptopaecile the bill is very slender, straight, sharp-pointed and entire; the nostrils are covered by a membrane and by some frontal hairs but not with feathers; the rictal bristles are strong and well developed. The wing is rounded as in Regulus but the tail is also well graduated.
There are several races, of which two have been found within the limits of this work.