24a (23). Mesoscutum with middle lobe bearing fine reticulations (Fig. A); antennal pedicel ca. 2X as long as 1st funicular segment (Fig. B); hind leg with tibial spur barbed (Fig. C); tarsal claw with >5 setae (Fig. D); avg. length of female 1.73 mm, male 1.15 mm; male metallic blue-black and noticeably smaller than female; general appearance (Fig. E); gregarious ectophagous pupal parasitoid inside host puparium; [distribution cosmopolitan].....................................……………….................…......(Chalcidoidea) - Pteromalidae - Nasonia vitripennis (Walker)

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24b. Mesoscutum with middle lobe bearing thick, raised reticulations (Fig. A); antennal pedicel <2X as long as 1st funicular segment (Fig. B); hind leg with tibial spur smooth, lacking spine-like structures (Fig. C); tarsal claw with 5 setae (Fig. D); avg. length of female 2.73 mm, male 1.75 mm; solitary ectophagous pupal parasitoid inside host puparium; [distribution North America] ................. …………….......(Chalcidoidea) - ............................................................................................................................................................................Pteromalidae - Urolepis rufipes (Ashmead)

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