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1.         Spiracular cleft at apex of anal division with long marginal hydrofuge (water-repelling) setae. . . .
            . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

            Spiracular cleft situated dorsally near apex of anal division and, if bordering hydrofuge setae,
            very short and inconspicuous. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

2.         Abdominal segments with lateral margins thinly compressed and biolbate; anterior lobe small
            and sharply pointed; posterior margin of anal division rounded. . . . . . . . . . . . Allognosta sp.

            Abdominal segments with lateral margins not stongly cocmpressed or appearing bilobate,
            anterior lobe blunt and not sharply pointed; posterior margin of anal division concave. . . . .
            . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Nemotelus sp.

3.         Antenna situated anterolaterally on head capsule and directed anteriorly or somewhat
            ventrally. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

            Antenna situated dorsolaterally on head capsule and directed dorsally. . . . Myxosargus sp.

4.         Anal division long and slender; apical portion with lateral margins nearly parallel; anus
            located anteriorly and swollen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Stratiomys sp.

            Anal division rarely over twice as long as broad, uniformly tapered posteriorly; anus
            not conspicuously swollen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

5.         Abdominal sternite 7 lacking sclerotized hooklike spines on poaterior margin; integument
            covered with minute peltate scalelike pubescence. . . . . . . . Odontomyia (Catatasina) sp.

            Abdoninal sternite 7 with hooklike spines on posterior margin; integumental pubescence
            variable. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

6.         Only abdominal sternite 7 with hooked spines. . . . . . . . Odontomyia (Odontomyiina) sp.

            Abdoninal sternites 6 and 7 with hooked spines. . . . . . . . Odontomyia (Odontomyia) sp.

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Key to Stratiomyidae Nymph Genera

From Courtney & Merritt, 2008