FIGURES 1–4. Heterostomus female. 1 in On the enigmatic Heterostomus curvipalpis Bigot, 1857, with a description of the pupa (Diptera, Brachycera)

FIGURES 1–4. Heterostomus female. 1: head, frontal view. 2: terminal abdominal segments (epigynium), shown on left side the ventral view, and on right side dorsal view. ce: cerci, hy: hypoproct, TIX and X: ninth and tenth tergites. 3: distal portion of hypogynium (eighth sternite and gonapophysis). 4: genital fork with basal parts of spermathecal ducts.