36 Mr. Westwood on new Insects. cula slender, slightly conical, obtuse, transparent white with a band of rose-colour. Oral tentacula short, thickish. Branchiae large, ovate, inflated and terminating in a slender white point, transparent, sprinkled with opake white ; placed in a crowded manner down each side of the back, of various sizes, smallest near the foot, and very large and much inflated towards the back. Foot milk-white, broad and rounded in front, and not much produced behind. Length \ of an inch. Among the rocks at low-water mark on the north side of Culler-coats sands ; very rare. Remarkable on account of its large central branchiae, which have a leaf-like outline. E. MINUTA. Body minute, pellucid, of a yellowish white. Dorsal tentacula long, slender, transparent. Oral tentacula very short. Branchiae few, clavate, orange, with white apices of various sizes arranged irregularly down the back, forming about two imperfect clusters, two or three papillae in each cluster being larger than the rest. Foot broad and rounded in front, the angles expanded into curved points. Length not quite ygths of an inch. One specimen found at Whitley under a stone at the lowest spring tide. E. NANA. Body yellowish, rather depressed. Dorsal tentacula linear, smooth, approximating. Oral tentacula shorter than the dorsal ones, linear, transparent. Head produced at the sides beyond their insertion. Branchiae subclavate, rose-coloured, incUning to orange, the central mass of a minute granular appearance ; apices white, disposed in seven or eight close-set rows of seven or eight each down the sides, leaving a broad space on the back. Foot transparent white, short-ish, rounded in front and produced into obtuse angles at the sides. Length 3%ths of inch. Under stones near low-water mark at CuUercoats and Whitley, rather rare. .....I^ewcastle, January 20, 1842. V. — Insectorum novorum Centuria, auctore J. O. Westwood^ F.L.S., &c. Decadis quartce, ex ordine Lepidopterorum et genere Papi-lionis, Synopsis. Papilio Bootes, W. Alls nigris valde elongatis ; posticis spa-thulato-caudatis, harum disco plag^ media alba vena nigra in duas partes divisa, macula ad angulum analem, lunulis tribus submarginalibus rufis ; incisionibus pallid^ marginatis, caudd-que bimaculat^ ; alis subtus similibus at pallidioribus ; omnibus plaga magna basali rufa; maculis lunulisque rufis majoribus, capite, collo et corpore infra rufo. Expans. alar. unc. 5. Hab. Sylhet in the East Indies. Allied to P. Philoxenus.