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Show 18/5.] MR. A. G. BUTLER ON NEW INDIAN LEPIDOPTERA. 391 4. Descriptions of several new Species of Indian Heterocerous Lepidoptera. By A R T H U R G. B U T L E R , F.L.S., F.Z.S., &c. [Received May 1, 1875.] The following species have recently been added to the National Collection :- Family SPHINGIDCE. Genus P A N A C R A. P A N A C R A PERFECTA, n. sp. Form of P. vigil, but pattern and coloration of P. metallica. Head, palpi, collar, pterygodes, and thorax above olive-brown ; a lateral line on the vertex of the palpi, along each side of the head, collar, and pterygodes lilacine; a central spot on the crest, and another in the middle of the collar, of the same colour ; a whitish line along the inner margins of the pterygodes; abdomen greyish brown in the centre, tinted with lilacine at the base, and with a dorsal double series of indistinct blackish spots, two on each segment; sides of the abdomen mahogany-brown, with a broad paler streak, ferruginous on the basal segments, but golden mottled with ferruginous on the posterior segments; primaries above olivaceous, varied on discoidal area with lilacine streaks, and longitudinal blackish and grey lines on the nervures; a black dot at end of cell surrounded by a lilacine zone; a piceous streak, followed by three blackish parallel oblique lines from internal margin to upper radial nervure ; apical and external areas (including the central portion of the interstices between the oblique lines) buff, varied with olivaceous; an irregular disco-submarginal brown line from apex to external angle, margined by a brownish diffused streak at its extremities and between the radials (at which point the external area is dark olivaceous); an exterior submarginal line parallel to the last, but not reaching the apex; outer margin olivaceous; secondaries rosy brown, clothed at base with greyish olivaceous hairs, external area dark brown, a double submarginal ochreous streak from just beyond the third median branch to the anal angle ; fringe yellow, spotted with black at the ends of the nervures: palpi below white, ferruginous at the sides ; pectus bright golden, varied in front with ferruginous, and at the sides with silver scales; coxae and trochanters sordid white, fringed with ferruginous, anterior femora and tibiae browu, tarsi white ; second pair of legs pale brown, the femora fringed above with orange, below with gold; third pair rosy whitish, the femora fringed below and the tibiae above with golden scales ; venter ferruginous, sprinkled all over with golden scales, a silvery lateral patch on the basal segments, a whitish central streak; a lateral row of black dots; primaries below with the basal half dark greyish brown, costa ochraceous ; external half ochre-yellow, a broad red streak tapering from the end of the cell to the apex ; the oblique lines of the upperside red, the submarginal lines blackish, with white interstitial line at |