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16. Median carina of propodeum (a1, a2) forked at nucha, forming large areole enclosing nucha; plicae incomplete, projecting from anterior corners of nuchal areole; carina present posterior to spiracle, patch of setae usually present posterior to carina, distinct from callus setae. Petiole with dorsal and lateral flanges. Occiput strongly concave, vertex carinate, eye reaching posterior margin of head in dorsal half (similar to Hoplocrepis). Basal flagellomeres (b1) in males and females serrate to mildly pedunculate. Pronotum (c1) semiglobose anteriorly, collar relatively long and broader than anterior portion of mesoscutum; sublateral scutellar grooves sinuate and converging medially.
16'. Propodeum (aa1) not at all as above: median carina not forked at nucha; plicae not as above, often completely absent; carina absent posterior to spiracle, without patch of setae distinct from callus setae. Petiole without dorsal and lateral flanges. Head not shaped as above, eye not reaching posterior margin of head in dorsal half. Basal flagellomeres in males and females not serrate. Pronotum (cc1) usually not shaped as above; sublateral scutellar grooves usually not sinuate. [Some apparently undescribed species, especially from the Neotropics, form intermediates between Deutereulophus and Elachertus. These specimens key to Elachertus here. I prefer to define Deutereulophus strictly, as above.].
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Image credits: a1, c1: Schauff, et al. (1997). a2, b1: Schauff (2000). aa1, bb1: Schauff (1985b).