44 



spicuously clouded with dull black, as figured. The tail is short and 

 inconspicuous; the nectaries are clavate, reaching to the tip of the 

 abdomen. The species is somewhat remarkable on account of the incon- 

 stancy of the wing venation. Certain of the terminal veins are often 

 wanting, as illustrated at b. The apterous or wingless female, shown 

 at<°, and the last stage of the nymph. (V7), are of similar general color 

 to the winged form, but usually paler. 



The length of the body and head together is about T V of an inch 

 (nearly 2 mm ) and the wing expanse about \ of an inch (5-»; mm ). 



Fig. 1.5. — RhopaZosiphum violas: a, winged female; b, wing of same, showing aberrant venation; 

 c, "wingless (agamic 1 ) female: d, nymph — all much enlarged (original i. 



DISTRIBUTION. 



This plant-louse is of doubtful nativity. The fact that it appears to 

 confine its attack to plants grown indoors would indicate a tropical 

 and therefore foreign origin: but as the species has been described 

 from this country, and is not known elsewhere, it will have to be con- 

 sidered native until we learn to the contrary. The present distribu- 

 tion includes the following localities, the list being necessarily small 

 on account of the newness of this insect as a pest: Toronto, Canada: 

 Poughkeepsie, Rochester, and Cornwall-on-Hudson. N, Y. ; Newton 

 Center, Mass.; Providence. P. I.; Garrett Park. TVaverly. Brooklyn, 

 and elsewhere in Maryland: District of Columbia: Gordonsville, Ya. 



DIVISIONAL RECORDS OF INJURY. 



In August. 1898, Mr. Dorsett visited Mr. Theodore Diedrich at 

 Anacostia. D. C, and ascertained from that gentleman that this 

 species had done immense injury to violet blossoms, the cash estimate 

 of his losses being placed at 81,000 to 81.200 for that year. 



