27–30 Mesosoma, lateral view 27 Rhimphoctona macrocephala. ec = epicnemial carina 28 Diapetimorpha brunnea Townes. Arrow indicates sternaulus curving ventrally anterior to posterolateral corner 29 Stethantyx nearctica. Arrow indicates foveate groove 30 Agriotypus armatus. mg = mesopleural groove, st = sternaulus 31–32 Mesosternum, ventral view 31 Therion longipes (Provancher). Arrow indicates incomplete posterior transverse carina 32 Dusona egregia. Arrow indicates complete posterior transverse carina.