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Doli males usually bear large genital capsule (hypopygium) with appendages directed down or even forward. Females have small, pointed, usually concealed oviscapt (ovipositor), always directed backward. See Gallery:
https://diptera.info/photogallery.php?album_id=14&rowstart=0
Most Argyra species like other Dolies have hairs on anterior slope of mesonotum only (except for 1-2 median rows of acrostichal hairs between dorsocentral setae). Compare with the setation of Argyra leucocephala on this picture: