38 



August 2, 1900. its occurrence on Apios tuberosa was reported by 

 the late Thomas A. Williams, of this Department. 



Violets and carnations were seriously injured during the last two 

 years in the District of Columbia, and we received in a letter dated 

 March 19, 1901, information concerning general destructiveness by 

 this species to strawberry in the vicinity to Galloway. Polk County. 

 Fla. Our correspondent. Mr. E. G. Gardner, stated that the mites 

 were always found on the underside of the leaves. 



IDENTITY OF THE SPECIES*. LITERATURE. 



The subject of the specific identifications of the different species of 

 red spiders which occur in this country, of which there are 11 distinct 

 forms described, together with the characteristics which distinguish 

 them, and other information of more or less technical import, has been 

 already made public in a paper entitled "The Red Spiders of the 

 United States." by Mr. Xathan Banks, published on pages 65-77 of 

 Technical Series Xo. 8 of this Division. 



Tebranyekus Mmaculatus was first described by the late Prof. F. L. 

 Harvey in 1S93 (Annual Report Maine State College Agr. Exp. Sta- 

 tion, Part IY. pp. 133-111. pi. 3). This account includes valuable 

 notes on the insect's habits and injuries, a tabulated list of host plants, 

 extracts from correspondence, and a consideration of remedies, besides 

 technical descriptions of the different stages of the species. 



In Galloway's Commercial Violet Culture, already quoted, consider- 

 able space is devoted to a consideration of this specise. mentioned as 

 " red spider " (pp. 190-198), particular attention being given to remedial 

 treatment based upon years of experience with it as it occurs on 

 violets grown under glass. 



The above-mentioned publications have been freely used in the prep- 

 aration of the present article. 



The species has been treated from the standpoint of an enemy of 

 sugar beets, with brief mention of its occurrence on hemp near Tre- 

 mont and Pekin. 111. . in 1899 and 1900, on pages 406 and 407 of Bulletin 

 No. 60 of the University of Illinois Agricultural Experiment Station, 

 by Messrs. Forbes and Hart. 



FOOD PLANTS AXD NATURE OF INJURY. 



The two-spotted red spider is inclined to be omnivorous, attacking 

 a wide range of both glabrous and hirsute plants belonging to several 

 families. It is present in greenhouses throughout the year, and appears 

 to be able at all times to be destructive if permitted to propagate. 

 Few plants are. in fact, free from the attack of this red spider, and it 

 is present in most greenhouses. \Yhcn only a few mites are present, 

 the plants seldom show any external evidences of injury, but as they 



