. Bulletin - New York State Museum. Science. AQUATIC INSECTS IN THE ADIRONDACKS 537 1867 Libellula trimaculata Packard, Am. nat. 1 : 310, pi. 9, fig. 1 1861 PI a the mis trimaculata Hagen, Synopsis Neur. JST. Am. p. 149 1873 Libellula trimaculata Riley, Ins. Mo. 5tb rep't, p. 14 (This article contains a woodcut of this species which has been most extensively copied in this country.) 1893 Plat hemi s trimaculata Calvert, Am. ent. soc. Trans. 20:259 1895-97 Platherais trimaculata Calvert, N. Y. ent. soc. Jour. 3 ; 47 and 5: 94 (listed from New York, Dobbs Ferry, Ithaca, Schoharie, Albany and Buf
. Bulletin - New York State Museum. Science. AQUATIC INSECTS IN THE ADIRONDACKS 537 1867 Libellula trimaculata Packard, Am. nat. 1 : 310, pi. 9, fig. 1 1861 PI a the mis trimaculata Hagen, Synopsis Neur. JST. Am. p. 149 1873 Libellula trimaculata Riley, Ins. Mo. 5tb rep't, p. 14 (This article contains a woodcut of this species which has been most extensively copied in this country.) 1893 Plat hemi s trimaculata Calvert, Am. ent. soc. Trans. 20:259 1895-97 Platherais trimaculata Calvert, N. Y. ent. soc. Jour. 3 ; 47 and 5: 94 (listed from New York, Dobbs Ferry, Ithaca, Schoharie, Albany and Buffalo) 1898 Li bell ul a trimaculata Needham, Outdoor studies, p. 57 and 65, fig. 56 and QQ 1899 Plathemis trimaculata Kellicott, Odon. Ohio, p. 102 (description) 1900 Plathemis lydia Williamson, Dragon flies Ind. p. 333 (description) This is another well known, widely distributed and generally common species, which inhabits ponds and ditches generally. I present herewith (fig. 32) a figure of its nymph, which I have pre- viously pubhshed in Outdoor studies. It differs from Libellula and Ladona in having the head widest behind the eyes, and from Libellula in having the front margin of the median lobe of the labium Nymph. Total length 24 mm ; abdomen 14 mm; hind femur mm; width of head mm, of abdo- men mm. Body elongate, rather smooth, and more free from dirt than most Libellulas, generally showing two bands of blackish brown extending from beneath the tips of the wing cases to the bases of the lateral ap- pendages. Head not widened behind the eyes, but with sides parallel; median lobe of labium promi-nymph of piathemis nent, but with no middle tooth on its fore margin ; ^^^'^^ ^''"• lateral setae 10; mental setae eight; of which the five outer ones are longer; abdomen triquetral, with moderate lateral spines on segments 8 and 9, and with rudimentary dorsal hooks on segments 3-5, highest on the fourth segment, absent from the hinder segments; latera
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