Abstract
The pupal case of the Nearctic robber fly, Diogmites contortus Bromley 1936, is described, illustrated, and compared with the pupal cases of three other Nearctic species, D. discolor Loew 1866, D. misellus (Loew 1866), and D. neoternatus (Bromley 1931). A key is provided to the pupal cases of these species. The main characteristics of the D. contortus pupal case are, (1) abdominal segment 1 with dorsal transverse row of 30 spurs, (2) abdominal segments 5–7 with uninterrupted ventral row of 41–47 bristle-like spines, and (3) abdominal segment 8 with 8 lateral bristle-like spines on each side.
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