ENGLISH SPECIES OF RED SPIDER. 



55 



Colour. Body pale yellowish green ; sometimes minute dark 

 specks, arranged in four small clusters, are pi-esent at the sides 

 and posterior end of the dorsum. 



Measurements. 6 , length 220-250 ^ ; $ , 340-380 

 Host plant. South American tree (Talisia p7nnceps), growing in 

 Tropical Greenhouse, Kew Gardens. 



5. Tetranychus telarius L. 



Acarus telarius (ad part.) Linnaeus, Syst. Nat. 1758, Ed. 10, 

 p. 616. 



Tetranychus telarius C. L. Koch, Deutsch. Crust., Myr., Arachn. 

 1838, heft 17, no. 12. 



T. russeolus C. L. Koch, op. cit. heft 17, no. 15. 



T. urticcB C. L. Koch, op. cit. 1835, heft 1, no. 10. 



Acai^us telarius Boisduval, Ent. Hort. 1867, pp. 82-84, text- 

 fig. 4. 



A. cucumeris Boisduval, op. cit. p. 84. 

 A. vitis Boisduval, op. cit. pp. 92-93. 



Tetranychus althcece Von Hanstein, Zeitschr. wiss. Zool. 1901, 

 Ixx. p. 74. 



T. telarius Ewing, Ann. Soc. Ent. America, 1913, vi. pp. 455- 

 457, text- fig. 1. 



T. althcece Trag;irdh, Stockholm Medd. Centralanst. Forsoksv. 

 Jordbruksomr. 1915, vol. 109, pp. 36-40 & 57. 



(S . Penis strongly curved near the end, and the tip furnished 

 with two minute but distinct barbs. 



Palj). Terminal finger of moderate length (about as long as the 

 two rod-like setaB situated near it). Dorsal sensory finger varying 

 slightly, but usually short and slender (sometimes, however, it is 

 sonjevvhat club-shaped). 



Claw of first leg in this sex with a little dorsal oftshoot, the 

 rest of the claw being divided into six short slender forks or teeth 

 (three on each side). 



$ . Palp. Terminal finger fairly well developed, but not very 

 long. Dorsal sensory finger also fairly well developed. 



Colour usually pale, being either whitish, greenish, or yellowish 

 in tint, with dark lateral spots or patches varying in extent, 

 sometimes quite extensive. More rarely pink or reddish indi- 

 viduals are met with. 



This species occurs on many plants, and was confused by 

 Linnseus, and later by Hermann, with the form occuiring on the 

 lime-tree (the latter creates the name tiliariu7n, but says that the 

 species occurring on the lime-tree is also found on Althcea, 

 a typical plant host for T. telarius proper). This mistake is 

 followed by many other authors, including recent authors of great 

 repute, nnd several other quite distinct species — viz., 2\ lintearius 

 Dufour (from gorse), T. popuU C. L. Koch (from poplar trees), 

 and the species living on the oak {Oligonychus querciuus) — have 

 also wrongly been regarded as synonyms of T. telarius. 



