pools of the shore. But the deep. cold waters of the lake, permitting no growth of water-piants, except occasionally in a sheltered cove, possess no attractions further. Accordmgy, the only water-birds we saw were Larus argentatus. Colymbus glacialis and Mergus cucullatus, all which we usually saw in smal numbers every day, and one specimen of Colymbus sententrionalis. In the neighborhood of Detroit we saw black terns in abundance, and heard that some of the high-colored species bred about St. Josepi's Island, but we saw non of then beyond the St. Clair.

beeng the importance that is beginning to be given to even mmute details of geographical distribution. I have subdivided the fol lowing list of species observed, so as to present first the species of most extensive range, and afterwards those of more confined localities.

IX.

DESCRIPTIONS OF SOME SPECIES OF LEPIDOPTERA, FROM THE NORTHERN SHORES OF LAKE SUPERIOR.

BY DR. THADDEUS WILLIAM HARRIS.

PONTIA OLERACEA H.

Pl. VII., fig. 1.

Pontia oleracea Harris, New England Farmer, vol. VIII., p. 402 (1829). Discourse before the Massachusetts Horticultural Society, p. 7, 21 (1832).-Catalogue of Insects of Massachusetts, in Hitchcock's Report, 1st ed. p. 589 (1833).—The same, 2d ed. p. 590 (1835).-Report on Insects of Massachusetts injurious to Vegetation, p. 213 (1841).-Kirby, Fauna BorealiAmericana, Part IV., p. 288 (1837).

Pieris oleracea Boisduval, Spécies Gén. des Lépidoptères, tome I., p. 518 (1836).

Alis subrotundatis integerrimis albis; anticis basi costaque nigricantibus, subtus apicem et posticis, infra, luteis fusco-venosis. Alar. exp. 2 unc.

Body black above. Antennæ black, annulated with white, and rufous at the tip. Wings yellowish white; the anterior pair dusky on the front edge and base; tip, beneath, pale yellow, with dusky veins. Under side of the hindwings pale yellow, with broad, dusky veins, and a saffron-yellow spot on the humeral angle.

The tip of the forewings is often marked with two or three little dusky stripes, in the males. The dusky veining of the under side of the hindwings is less distinct in the females than in the other sex,

and is sometimes entirely wanting. Specimens of the females have been seen, though rarely, with one or two dusky spots on the upper side of the forewings, towards the outer margin.

The eggs of this insect are pyriform, longitudinally ribbed, and of a yellowish color. The larva is pale green, very minutely sprinkled with darker dots, and with a darker dorsal line. It grows to the length of one inch and a quarter. Its natural food is unknown, but it is found abundantly on the leaves of the mustard, turnip, radish, cabbage, and other cultivated oleraceous plants, to which it is often very injurious. The pupa is pale green or white, regularly and finely spotted with black. There is a conical projection on the front, and a securiform one on the thorax; and the sides of the body are angular and produced in the middle. Length of the pupa eight-tenths of an inch. The pupa state lasts about eleven days in the summer, and continues through the winter; there being two broods of the larva in the course of one season.

This species rarely extends further south than the latitude of New Hampshire. It has not been figured before. Mr. Kirby's Pontia casta may, perhaps, be only a variety of it.

DEILEPHILA CHAM ENERII H.

Pl. VII., fig. 2.

Sphinx Epilobii Harris, Cat. Ins. Mass. in Hitchcock's Report, 1st ed., p. 590 (1833).-The same, 2d ed., p. 591 (1835). Deilephila Chamænerii Harris, Catalogue of North Amer. Sphinges. Amer. Journ. Science, vol. 36., p. 305 (1839).

Olivaceo-brunnea; capite thoraceque linea laterali alba; alis primoribus vitta duplici intermedia, apice attenuata, parte exteriori dentata pallidé ochracea, parte interiori flexuosa fusca; secundariis nigrofuscis, fascia lata macula rubra includente rosea, intus, ciliisque albis; abdomine punctis sex dorsalibus albis, lateribus fasciis duabus nigris et albis prope basin, duabusque albis posterioribus abbreviatis. Alar. exp. 23-3 unc.

Olive-brown, with a white lateral line, extending from the front

above the eyes on the sides of the thorax, where it is margined above with black. Palpi white below. Forewings with a black spot at base and another adjacent to a white dash within the middle of the outer edge; a flexuous buf-colored stripe, beginning near the base of the inner margin, indented externally, extends to the tip, and is bounded within by a dark brown tapering stripe. Hindwings blackish, or dusky brown, with a broad sinuous rosy band including a deep red spot, and uniting with a white one near the inner angle. Fringes of the hindwings, and inner edge of the forewings white. Abdomen with a dorsal series of six white dots; two black and two alternating white bands on each side of the base, and two narrow transverse white lines near the tip; ventral segments edged with white. Legs brown; the tibiæ edged externally with white.

This species, which occurs abundantly in New Hampshire, was taken on the northern shore of Lake Superior, and is now figured for the first time. It is the American representative of Deilephila Galii. Mr. Kirby's D. intermedia, which has the stripe on the forewings of a pale rose-color, and wants the dorsal series of white dots, may possibly be a local variety of D. Chamænerii. The larva of our species lives on the Epilobium angustifolium. It is bronzed green above, and red beneath, with nine round cream-colored spots, encircled with black on each side, and a red caudal horn.

SMERINTHUS MODESTA H.

Pl. VII., fig. 7.

Smerinthus modesta Harris, Catalogue of North American Sphinges. Amer. Journ. Science, vol. 36., p. 292 (1839).

Olivaceo-ochracea; capite parvo non cristato, masculorum antennis subtus transversé biciliatis; alis primoribus crenatis, strigâ flexuosa transversa basali virguloque stigmaticali pallidis, fasciâ lata undulata media, strigisque duabus crenatis posterioribus, saturaté olivaceis; secundariis medio basique purpureis, maculâ transversa nigra fasciâque abbreviata fusca prope angulum analem sitis.

Alar. exp. 5 unc.