ENGLISH SPECIES OF RED SPIDER. 



59 



tree, horse -cliestniit, copper-beecb, Scotcb laburnum (Kevv 

 Gardens), and American flowering currant. Altbougb usually 

 found in the open, in one case I discovered acacias (Acacia lon- 

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

 numerous specimens of this mite. 



Text-figure 5. 



a. Terminal part of palp of Oligonifchus giievcinus ^. h. Ditto of O. ulmi ^. 

 c. Ditto of O. simplex $ . d. Ditto of O.unungnis $ . e. Ditto of O. quer- 

 einiis S . f- Ditto of O. ^lJmi $ . //, Ditto of O. simplex $ . h. ])itto of 

 O. ununguis $ . 



2. Oligonychus ununguis 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 sensoiy finger. 



5 . Palp. Terminal finger very like that of 0. ulmi, being 

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

 whereas in 0. ulmi it is somewhat naiTowed 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 /x; ^ , "67^ ^jl. 



Host plant. Pinus sylvestris ; Oxshott, Surrey. 



3. Oligonyciius quercinus Berlese ?, 1886. 



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

 Padua, 1886, p. 23. 



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

 mata, p. 58. 



