. Aquatic insects in New York state ; a study conducted at the entomologic field station, Ithaca, N. Y. under the direction of Ephraim Porter Felt. Insects; Aquatic insects; Dragonflies; Fishes. AQUATIC INSECTS IN NEW YORK STATE 471 of the fore wings. Prothorax quadrangular, much narrower than the head and shorter than the mesothorax and the meta- thorax combined; large toothlike angles on the back part of the sides of the head; three large approximate ocelli facing at about 120° from each other; antennae filiform moniliform or slightly serrate in a few species, as long as, or much longer than
. Aquatic insects in New York state ; a study conducted at the entomologic field station, Ithaca, N. Y. under the direction of Ephraim Porter Felt. Insects; Aquatic insects; Dragonflies; Fishes. AQUATIC INSECTS IN NEW YORK STATE 471 of the fore wings. Prothorax quadrangular, much narrower than the head and shorter than the mesothorax and the meta- thorax combined; large toothlike angles on the back part of the sides of the head; three large approximate ocelli facing at about 120° from each other; antennae filiform moniliform or slightly serrate in a few species, as long as, or much longer than the head and thorax combined; mandibles prominent, not concealed by the labrum when closed, those of the male more or less elon- gated and annular, incurved, suited only for clasping. Wings numerously veined, the accessory veins of the radial sector ex- tending backward from E2 in both pairs of wings, and media has more than two branches [fig. 26]; hind wings broad at base and folded in the anal area when at rest; wing expanse 100 to. Pig. 86 Fore wing of Corydalls cornuta x2 150mm. Tarsi cylindric; male caudal appendages long and usually strongly forcipate; in the female they are short and simple. Larva. When full grown, the larva is about 80 to 90 mm long. The general color is dusky; the head and thorax are supplied above with pretty figured markings; the whole body is supplied with black clavate projections except in the intersegmental folds and on the parts heavily clothed with chitin. The last four or five segments of the abdomen taper toward the caudal end of the body. The first eight segments of the abdomen are each pro- vided with a pair of unjointed lateral filaments, 6 to 7 mm long, somewhat clothed with hairs; the first seven of these segments are each provided with a pair of ventral tufts of tracheal gills. Spiracles are found on each of the firsit eight abdominal seg- ments and on the fold between the prothorax and the meso- thorax, and a rudimentary pair on a fo
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