. Bulletin - New York State Museum. Science. AQUATIC INSECTS IN NEW YORK STATID 227 This is the common and perhaps the only species in New York State. The above account of the habits of the genus has been written with this species in mind. It is as yet recorded from but three localities in the State, but it will doubtless be found in many other places when proper search is made for it. Its nymph has not been described, but in 1880 Dr Hagen drew char- acters distinctive of the genus from nymphs which he referred to H. californica, H. a. mericana, H. titia and an undetermined species from Brazil
. Bulletin - New York State Museum. Science. AQUATIC INSECTS IN NEW YORK STATID 227 This is the common and perhaps the only species in New York State. The above account of the habits of the genus has been written with this species in mind. It is as yet recorded from but three localities in the State, but it will doubtless be found in many other places when proper search is made for it. Its nymph has not been described, but in 1880 Dr Hagen drew char- acters distinctive of the genus from nymphs which he referred to H. californica, H. a. mericana, H. titia and an undetermined species from Brazil,^ and Calvert^ and Williamson* have used these characters in keys to American nymphs. Nymph. Length of body 17mm; antennae 4mm additional; gills 7mm additional. Color greenish or brownish, paler on the sutures, on legs and on margins of gill plates, but without distinct color pattern. Occasional specimens show faint indica- tions of darker transverse bands on the tibiae and gill plates. Head fiat above, with rounded eyes set well forward, with hind angles obtuse and having a much less distinct superior tooth than that of Calopteryx. Antennae long, inserted into large frontal prominences, somewhat shorter than the head is wide, the first segment longer than the following six, which rapidly and successively decrease in length and thickness. Labium long, the hinge extending posteriorly between the bases of the middle legs; mentum suddenly and greatly dilated in its apical half, its median lobe divided into two lobes by a ^,^^ Autenua. ana end of median cleft, which is rounded basally and abdomen showing lateral â â¦' spines and gill plates, of extends barely below the level of the bases am'l'ric°ana°''**^''*"-^ of the lateral lobes of the labium; the distal end of the cleft is closed by the apposition of the two divisions of the median lobe; beside the cleft on either side is a single small spinule. Each lateral lobe of the labium is straight on its outer margin, wi
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