. Annual report of the Regents. New York State Museum; Science. 434 NEW YORK-STATE MUSEUM Family aesckcnidae This family contains four subfamilies that are so different in character and habits they may be best discussed separately. The following keys will serve for their separation. KEY TO SUBFAMILIES Iniagos a Stigma braced at its inner end against an inclined cross vein in the space below it (see fig. 9) 6 Cubital vein in the fore wing extending directly to the hind angle of the tri- angle, not appearing forked ; subtriangle consisting of one cell, or indistinctly developed c Eyes widely sep
. Annual report of the Regents. New York State Museum; Science. 434 NEW YORK-STATE MUSEUM Family aesckcnidae This family contains four subfamilies that are so different in character and habits they may be best discussed separately. The following keys will serve for their separation. KEY TO SUBFAMILIES Iniagos a Stigma braced at its inner end against an inclined cross vein in the space below it (see fig. 9) 6 Cubital vein in the fore wing extending directly to the hind angle of the tri- angle, not appearing forked ; subtriangle consisting of one cell, or indistinctly developed c Eyes widely separated on the top of the head Gomphinae CO Eyes approximated on the top of the head Aeschninae p. 462 Ih Cubital vein in the fore wing apparently forked at the base of the second cubito anal cross vein; subtriangle of three cells. Petal urinae p. 472 aa Stigma without a brace vein Cordulegasteriuae p. 473- Aymp/is a Labium flat (or with the edges of the lateral lobes slightly upturned in Tachopteryx), and without raptorial setae & Labium with its median lobe entire; antennae four jointed, the fourth joint rudimentary ; fore tarsi two jointed: burrowing nymphs. Gomphinae &6 Labium with a short median cleft (fig. 8B); antennae seven jointed, setaceous; tarsi three jointed ; climbing nymphs, with eyes at sides of head Aeschninae 66& Labium with a shallow median cleft (fig. 15); antennae seven jointed, short; squatting nymphs, with face vertical, and eyes on anterolateral angles; depressed, hairy; tarsi three jointed P e t a 1 u r i n a e aa Labium spoon sbaped, with raptorial setae, differs from libellulid nymphs in having the prominent median lobe of the labium cleft into two vari- ously formed teeth at apex (fig. 16) Cordulegasterinae Subfamily goimfhinae Mostly large species, with clear wings, bodies striped with black and green or yellow, of strong but not well sustained flight, inhabiting mostly. Fig. 10 Diagram illustrating the parts of the bead and thorax chiefl
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