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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 



