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Show 86 DR. A. GtTNTHER ON THE ZOOLOGICAL [Feb. 6, The smaller " nymph " (Tramea 1) (fig. 2) is only 19 millims. long. Uniformly very shining, brown, with a tinge of blackish above ; pale greyish yellow beneath. Eyes deep black. Mouth-parts even still more prominent than in the form above described : mandibles thickly sprinkled with small blackish dots ; the interlocked edges without visible teeth. Head above with an oblong depression behind the region of the ocelli, with a lateral extension on each side, dilated, and forming broad shallow pits, in which the antennae are inserted. Pronotum with a broad yellowish median band ; its posterior edge raised and rounded. Anterior rudimentary wings narrow, extending over the hinder margin of the 7th segment; posterior very broad at the base in the anal portion, network distinct, the apices extending to beyond the middle of the 8th segment. Abdomen very short and broad; each ventral segment with two small blackish spots, having a tendency to form two lines on the terminal segments ; alate lateral portions extremely broad; Sth and 9th segments each produced laterally and posteriorly into a lanceolate acute process, with fine spines on the outer edge, that on the Sth extending to about the apical margin of the 9th, that on the latter equally long, and extending beyond the anal processes. Median dorsal anal process lanceolate, strong, curved downward, its dorsal edge with long blackish spines towards the apex. Lateral superior processes slender and spiniform, blackish at the tips, as long as the dorsal. Lateral inferior processes much longer, stronger, and nearly straight, furnished with long and strong black spines, inferiorly at the base with long yellowish spiniform hairs. Legs much longer than in the form above described, more slender, pale brownish, but with a faint blackish line on the femora and tibiae externally, and with blackish tubercles on their edges, whence arise short yellowish spines. This " nymph " is evidently in its last stage before the exclusion of the imago. The neuration of the hind wings is distinct; and the position of the triangle warrants the belief that it pertains to Tramea. Upon comparing these "nymphs" with those of two familiar European species, viz. Plathemis depressa and Diplax striolata, the most striking feature is the greater prominence of the mouth-parts, the longer and more slender legs, and the absence of the dorsal dentate crest on the abdomen. P. depressa has the angles of the apical segments not produced into processes ; but in D. striolata the processes are very evident, and approach the forms here described. X. LEPIDOPTERA, ORTHOPTERA, and HEMIPTERA. By A. G. BUTLER. The following list contains not only the species collected by Commander W . E. Cookson, but also some Hemiptera discovered by Charles Darwin, Esq., during the visit of the " Beagle," and recently deposited in the British Museum. Among the species most worthy of note may be especially mentioned a beatiful little moth (Cydosia sylpharis, n. sp.) obtained by Commander Cookson, and certainly the most splendidly coloured form of that genus yet described. |