Genus Idiasta Foerster, 1863

Type species.

Idiasta (Alysia) maritima Haliday, 1838

Diagnosis.

Mandibles with three teeth, ventral and diagonal ridges well developed. First flagellar segment equal or shorter than second. Fore wing pterostigma broad, discrete, wedge-shaped; 2-SR vein longer than 3-SR. Hind wing with m-cu present, often well developed, M+CU generally equal to or longer than 1-M.

Hosts.

Muscidae ( Diptera).

Distribution.

Cosmopolitan.