ENGLISH SPECIES OF RED SPIDER. 57 



5 . Palp. Terminal finger very like that of T. tiliarium, beirag 

 well developed and of moderate stoutness. Dorsal sensory finger 

 quite slender. 



Colour pale greenish or yellowish, sometimes with dark lateral 

 spots. 



Measurements. S , length 215 /x ; $ , 340 fx. 



Host plant. Hornbeam [Carjyimi^ hettdus) ; a number of speci- 

 mens from a tree of this species growing in London. 



8. Tetranychus TILIARIUM (Herm.), Koch 1838. 



Trombidium tiliarium (ad part.) Hermann, Mem. Apt. 1804, 



pp. 42, 43, pi. ii. fig. 12. 

 „ telariiis (ad part.) Hermann, op. cit. pp. 40, 41. 



,, sociiom Hermann, op. cit. p. 43, pi. ii. fig. 13. 



Tetranychus tilia7-iicm Koch, Deutsch. Crust., Myr., Arachn. 



1838, heft 17, no. 12. 

 ,, socius Koch, op. cit. heft 17, no. 16. 



„ telarius (ad part.) Oanestrini, Prospett. Acai-of. 



Ital. 1890, iv. p. 434. 

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



reperta, 1889, fasc. Ivi. no. 5. 

 „ telaritts Von Hanstein, Zeitschr. wiss. Zool. 1901, 



Ixx. p. 74. 



c? . Penis very long and slender, being in the form of an almost 

 straight (only slightly sinuous) style. 



Palp. Terminal finger long and slender, being more slender 

 than in the female. Dorsal sensory finger short but slender. 



Claw of first leg bifurcated, each fork bearing three minute but 

 sharp denticles ; claws of the other legs ending, as in T. telarius, 

 in six fine hairs. 



5 . Palp. Terminal finger well developed, being fairly long and 

 of moderate width. Dorsal sensory finger short and slender. 



Colour. Pale green, yellowish, or whitish, with minute dark 

 markings, chiefly lateral in position, but occasionally there are 

 one or two minute dark specks in the centre of the dorsum 

 as well. 



Egg whitish. 



Measurevients. d , length 260-305 /x ; $ , length 420-490 /a : 

 penis about 57 yu in length. 



Host plant. Lime-tree (Tilia europcea). I ha,ve also found 

 specimens of this mite on a hawthorn and on a willow, also in 

 abundance on hazels near Exeter. 



Note. — Hermann was the first author to use the name tiliarium 

 as a specific name, but he mentions it as occurring also on Alcea 

 [Althcea] rosea, and his specimens from this plant are probably 

 referable to T. telarius. Fortunately, C. L. Koch limits the 

 species to examples from lime-trees only, and there is a good deal 

 of reason in this, for it occurs on very few other plants. 



