56 



MR. STANLEY HIRST ON THE 



T. telarius is our Common Ked Spider, being found on many 

 plants, both in the open and in greenhouses, It is especially fond 

 of hollyhocks (Althcea), but attacks numerous other cultivated 

 flowers and also weeds. It often infests strawberries, beans, mint, 

 peaches, cucumbers, and melons (in hothouses), also grape-vines. 

 The hop-gardens in Kent and elsewhere are often greatly 

 damaged by this pest. It sometimes attacks bushes and trees — 

 for instance, elders, rose-trees, laburnum, poplars, etc. 



6. Tetranychus lintearius Duf., 1832. 



Tetranychus lintearius L. Dufour, 1832, Ann. Sci. Nat. (1) 

 XXV. pp. 276-283, pi. ix. figs. 4 & 5. 



T, lintea7'ius Lucas, Ann. Soc. Ent. France, 1868, (4) viii. 

 pp. 741-743. 



T. telarius (ad part.) Canestrini, Prospett. Acarof. Ital. 1890, 

 iv. p. 434. 



T. telarius (ad part.) Berlese, Acari etc. in Ital. reperta, 1889, 

 fasc. Ivi. no. 5. 



T. telarius Berlese, Gli Insetti, 1912, ii. p. 95. 



(5 . Penis very like that of T. telariits, but wider and shorter. 



Palp. Terminal peg-shaped, sensory bristle comparatively short 

 and of moderate width. Dorsal sensory finger short and club- 

 shaped. 



Legs. Both the first and second legs of the male have the claw 

 modified so as to form a kind of comb of minute teeth, whereas 

 in T. telarius the claw of the second leg ends in the usual six 

 fine hairs. 



$ . Palp. Terminal finger rather short and wide, being shorter 

 than in T. telay^ius. Dorsal sensory fiuger rather short but 

 not slender. 



Measureynents. $ 450-530 



Host plant. Gorse (Ulex europoius) \ many hundreds of speci- 

 mens collected by the author from infected bushes on Malvern 

 Hills in 1917 ; unfortunately only one male example was present 

 in this material. The masses of white web formed this species 

 are very obvious, and at once attract attention. Considerable 

 damage is done to the gorse by this mite in certain areas on the 

 Malvern Hills, and it is sometimes necessary to fire the bushes to 

 get rid of it. 



7. Tetranychus carpini Oudemans. 



S'. Penis very like that of T. tiliarium, but always strongly 

 sinuous, instead of being practically straight as in that species. 



Palp. Terminal finger very like that of T. tiliarium, being long 

 and slerder. Dorsal sensory finger very slender. 



Claiv of first leg bifid ; each of the two prongs consists of a 

 fairly strong middle tooth or spine, from which spring a dorsal 

 and a ventral hair or seta (in 2\ tiliarium the dorsal and ventral 

 offshoots are much stronger, being spiniform like the middle one). 



