Cochylis is characterized by the combination of the following characters: adult small to medium; forewing with all veins separate, Sc reach ing middle of the costal margin, basal distance between R1-R2 about three times of between R2-R3, R5 to the costal margin; hindwing with costal fold in male, Rs and M1 arising from the same point or long stalked, M3 and CuA1 separate, female hindwing usually with two spines in the frenulum; male genitalia: tegumen short and broad; uncus and gnathos absent; socius separate, drooped, connected with distal part of tegumen at base; median process of the transtilla mostly developed and dentate distally (absent in a few species); sacculus developed with a hook-shaped process basally in some species, with or without terminal process; slender vinculum separate ventrally; phallus without cornutus or with cornutus composed of a bundle of spines; female genitalia: sterigma varied in size and sclerotized diversely; antrum developed and heavily sclerotized; ductus bursae short, indistinctly distinguished from the corpus bursae; corpus bursae membranous, densely suffused with tiny spines.
In the Palaearctic Region, there are one or two generations annually, and over-wintering occurs in the larval stage. Larvae are oligophagous and feed mainly on plants belonging to Asteraceae ( Razowski 1987).
All species are distributed in the Holarctic, Oriental and Neotropical regions.
Key to Chinese species of Cochylis based on male genitalia
Phallus uniformly slender
Phallus stout basally, slender distally
Phallus with cornutus ( Razowski 1970: Taf. 106, Fig. 270)