THE RED SPIDER ON COTTON. 3 



rainfall, and temperature between these coastal and inland zones 

 probably explains the restriction of occurrence. 



CLASSIFICATION AND SYNONYMY. 



Owing to the extreme minuteness of red spiders generally, to 

 marked variations due to age, host plant, environment, or other 

 causes, and to the microscopic characters which are employed in the 

 taxonomic treatment of the group, the spinning mites have afforded 

 much speculation among speciaUsts and have caused considerable 

 duphcation and confusion of names. 



Ewing has pubhshed his opinion that T. himaculatus Harvey, T. 

 sexmaculatus Riley, and T. gloveri Banks are identical with T. tel(b- 

 rius. The final settlement of this question will be possible only after 

 a careful comparative study has been made of material collected from 

 the locahties and hosts recorded for the respective European species. 

 The foUowmg list represents the synonymy of the original European 

 red spider ( T. telarius) as claimed by various workers since Linnseus, 

 chiefly for the purpose of indicating the present confusion in the 

 group. 



Tetranychus telarius L. 



1761. Acanis telarius L.; 1804, Trombidium t. Herm.; 1834, Tetranychus t. Dugds. 

 1804. Trombidium tiliarium Herm.; 1834, Tetranychus t. Duges; 1867, Acaru^ t. 



Tiirpin; 1875, Tetranychus t. Koch. 

 1804. Trombidium. mains TiGYTa.; 1834, Tetranychus m. Duges. 

 1804. Trombidium tenuipes Herm.; 1834, Tetranychus t. Dugea. 

 1804. Trombidium socium Herm.; 1867, Acarus s. Muller; 1875, Tetranychus socms 



Koch. 

 18.32. Tetranychus lintearius Dufour; 1867, Acarus I. Boisduval; 1877, Tetranychus I. 



Murray. 

 1867. Acarus rus-vilus Boisduval ; 1875, Tetranychus r. Koch. 

 1867. ^carws a'/ti Boisduval; 1877, Tetranychus t. Murray. 

 1867. Acarus cucuineris Boisduval; 1877, Tetranychus c. Murray. 

 1867. Acarus rosanim Boisduval; 1877, Tetranychus r. Murray. 

 1867. Acarus cinrmbarinus Boisduval; 1877, Tetranychus telarius var. c. Murray. 

 1867. Amrnis haematodes Boisduval ; 1877, Tetranychus telarius var. h. Murray. 

 1867. Acarus vitis Boisduval; 1877, Tetranychus v. Murray. 

 1867. Tetranychus ferrugineus Boisduval. 

 1875. Tetranychus urticae Koch. 

 1875. Telranychu.8 fernvlu.8 Koch. 

 1875. Tetranychus popuH Koch. 

 1875. Tetranychus pi/jer Donnadiou. 

 1875. Tclranychuji minor Donnadieu. 

 1875. Tetranychus lonf/ilar.ris Donnadieu. 

 1875. Tetranychus plumi^stoma Donnadieu. 

 1875. Tetranychus rube^Oins Donnadieu. 

 1875. Phytor/)pt/'.s epi/krmi DonnadicM. 

 1875. PhytX)Cf>pU:H (faUaru.m Donnadieu. 



1875. l'hytocf>pleH nervonim Donnadieu. 



1876. Tetranychus pilosus 0. and F. 

 J8(K). Tetranychus (j-rrmailnlus Riley. 

 1892. TetrnnychuH birnaculatus Harvey. 

 UK)0. TrtrrifD/rhiiH (/lorrri I{ankH. 



