As said elsewhere on this site subfamily sarcophaginae is very difficult to identify. Here is a guide to the various structures of the male genitalia, that one uses to identify species:
Notable features for
identification of Sarcophaga inaequalis (Austen) 1909; 1 Lateral view
of the male genitalia, 2 Anterior (front)/ventral (belly) view of the phallosome, 3a posterior (rear) view of the cercus
(phallosome removed), 3b lateral view of cercus (phallosome removed), 3c
Posterior view of the cercus and phallosome (referred to as the distiphallus
in some texts) (a: paralobus, b: anterior and posterior parameres (also
referred as the pre- and post-gonites in some texts), c: vesicae/ membranal lobes, d: juxta and
processi (arm-like projections) of the juxta.