ENGLISH SPECIES OF RED SPIDER. 



59 



tree, horse -cliestnut, coppei-- beech, Scotch laburnum (Kew 

 Gardens), and American flowering currant. Although usually 

 found in the open, in one case I discovered acacias {Acacia Ion- 

 gifoUa etc.) and a Sapindus saponaria under glass infested with 

 numerous specimens of this mite. 



Text-tiffure 5. 



a. Terminal part of palp qf Oligonychus guercinus $ . b. Ditto of O. tilmi <? . 

 c. Ditto of O. simplex ^ . d. Ditto of O. unungids $ . e. Ditto of O. quer- 

 cinus $ . f- Ditto of O. tdmi $ . ff. Ditto of O. simplex $ . h. Ditto of 

 O. ununguis $ . 



2. Oligonychus ununguts Jacobi, 1905. 



(S . Penis very strongly curved, being very like that of 0. ulmi 

 in shape. 



Palp. Terminal finger small, but much longer than wide ; it 

 is shorter than the dorsal sensory finger. 



$ . Palp. Terminal finger very like that of 0. tdmi, being 

 short but not so wide and almost truncate when viewed laterally, 

 whereas in 0. ulmi it is somewhat narrowed or compressed near 

 the base, the distal half being wider, so that it is knob-shaped. 



Colour. This species is deeply pigmented, the abdomen being 

 blackish, but there is usually a pale brownish central streak 

 posteriorly ; cephalothorax ochraceous or red ; legs ochraceous. 



Measurements. S , length 260 yu- ; 5 » 370 /x. 



Host plant. Pinus sylvestris ; Oxshott, Surrey. 



3. Oligonychus quercinus Berlese ?, 1886. 



Tetranychus quercinus Berlese, Acari dann. plant, coltiv., 

 Padua, 1886, p. 23. 



T. telarius Berlese, Acari etc. in Ital. reperta, Ordo Prostig- 

 mata, p. 58. 



