\t €mdm\ mmmU^hl Vol. XXXII. LONDON, FEBRUARY, 1900. No. 2 CONTENTS. Pcrgande -New plant-louse on violets 29 Banks — On two genera of Mites 30 Coquillett — New genera and species of Ephydrid.-ij 33 I lames — New species and varieties of Lepi-doptera 42 Dyar — North American Vponomentid;e 37 Baker — Four new species of Platymetopius. . 49 Webster and Mally — The Purslane Saw-fly. . 51 Howard — Popular name for Clisiocampa disstria 54 Johnson — The destructive green-pea louse. . . 56 A NEW SPECIES OF PLANT-LOUSE INJURIOUS TO VIOLETS. BY THEODORE PERGANDE, WASHINGTON, D. C. Among several species of insects which have lately come to the notice of the Division of Entomology of the U. S. Department of Agricul-ture, through their ravages upon greenhouse violets, is a little species of plant-louse known to florists as the black or brown aphis. The species is now very generally distributed in the United States and occurs in Canada, although it was not known until within five or six years from the time of writing. As it appears to be undescribed, I propose the specific name vio/ce, and have placed it in the genus Rhopalosiphum, to which it appears to belong. The following description is submitted, pending a more detailed account of the injuries and a consideration of remedies which it is expected will shortly be published by the Department of Agriculture. Rhopalosiphum vioice, n. sp. Apterous females dark cherry-brown and polished, the larvae and pupae generally somewhat paler. Eyes dark brown, third joint of antennse more or less distinctly of a paler colour than the body, the remaining joints black. Legs purplish, the femora darkest towards the end and the apex of the tibiffi and the tarsi black. Nectaries purplish. Head and thorax of the pupte generally paler than the rest of the body. Winged females also dark cherry-brown or purplish-brown, the antennae, thoracic lobes, terminal two-thirds or more of femora, apex of tibiee and tarsi black ; rest of the legs of a dull yellowish colour, with a tinge of purple. Nectaries and tail dusky. Wings clear, the veins stron^^ and black and conspicuously shaded ; stigma black; stigmal vein short
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