FIGURES 253–257. Female postabdomens. 253 Procystiphora coloradensis Felt, 7 in Key to Adults of North American Genera of the Subfamily Cecidomyiinae (Diptera: Cecidomyiidae)

FIGURES 253–257. Female postabdomens. 253 Procystiphora coloradensis Felt, 7th segment to cerci (dorsal). 254, Vitisiella brevicauda (Felt), 7th segment to cerci and detail of posterior end (dorsolateral). 255, "Mayetiola" californica Felt, protrusible part of ovipositor and detail of covering microtrichia (dorsolateral).256, Acericecis ocellaris (Osten Sacken), protrusible part of ovipositor (dorsolateral). 257, Mayetiola destructor (Say), 6th segment to cerci (dorsal).