. Annual report. New York State Museum; Science -- New York (State); Plants -- New York (State); Animals -- New York (State). os:o NEW YORK STATE MUSEUM been studied and collected suflScientlr for the determination of this matter. It would be utterly impossible at present to give a key that would distinguish females, and a key for the males based on coloration would have to be offered tentatively, since the range of variability in color pattern has not been determined. Instead of attempting a key, I have thought best to present herewith drawings of the appendages of the male of all species kno
. Annual report. New York State Museum; Science -- New York (State); Plants -- New York (State); Animals -- New York (State). os:o NEW YORK STATE MUSEUM been studied and collected suflScientlr for the determination of this matter. It would be utterly impossible at present to give a key that would distinguish females, and a key for the males based on coloration would have to be offered tentatively, since the range of variability in color pattern has not been determined. Instead of attempting a key, I have thought best to present herewith drawings of the appendages of the male of all species known from the State, these being the surest criteria for the recognition of the species. The males can ^hen be determined by comparison with the figures, and the females can be kept with the males with which thev are found associated in nature. As is to be expected in such a genus, the nymphs are very much alike. A brief general description here will therefore save much repetition in treating of the sjiecies. Nymph. The nymph of Enallagma is slender, nearly smooth, with the head a third wider than succeeding parts of the body (the excess of width being wholly due to the lateral prominence of the eyes), and with abdomen very slightly taper- ing posteriorly. The head is one half wider than long, with frons moder- ately xu'ominent, broadly rounded hind angles, and a wide posterior excava- tion between them. Antennae long, slender, seven jointed, the segments increasing in length to the third, and decreasing thereafter to the tip. Legs slender, nearly smooth, often banded with brown. Wing cases reach pos- teriorly to the middle of the fourth abdominal segment. Abdomen cyliu- drie, its segments decreasing a very little both in length and in diameter toward the apex. Gills lanceolate, pointed, with variable color ]>attern. Labium slender, with prominent median lobe, lateral lobes upcurved at. Fig 10 The nymph of En al lag ma s 1 g n a t u m: ^1, lateral view of median glU lamella. ^
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