ENGLISH SPECIES OF RED SPIDER. 



51 



Note. — Tragardh has created a new genus {Schizotetranychus) 

 for this species, which certainly is veiy peculiar in having all the 

 claws bifid in both sexes. The penis is, however, very like that 

 of T. cratcegi. Moreover, the male of 2\ populi has the first leg 

 shaped like that of T. schizopus. On the whole, I think it is not 

 necessary to place this species in a separate genus. 



Text-figure 1. 



a. Lateral view of penis of Tetranychus schizopiis. h. Ditto of T. popidi. c & 



Ditto of T. tiliar'mm. d, e,f. Ditto of T. talisice. g. Ditto of T. cratcegi. 

 h. Ditto of T. carpini. i. Ditto of T. telarius. l\ Ditto of Oligonyclnis 

 ununguis. I. Ditto of O. qtiercinns. m. Ditto or O. ulmi. n. Ditto of 

 O. simplex. 



2. Tetranychus crat^gi, sp. n. 



. Penis very like that of T. schizopus in shape, being strongly 

 curved and with a long spiniforni process at the end, also a very 

 minute and inconspicuous tubercle which no doubt represents 

 the barb of the other side. 



Palp. Terminal finger in the form of a very minute and in- 

 conspicuous cone or tooth. Dorsal sensory finger apparently 

 variable in length. 



Clmo of first leg in this sex distinctly bifid, being divided 

 into two strong prongs ; one or two frail hairs are pi-esent on 

 these prongs, and no doubt correspond to the spines present in 

 2\ tiliarium. 



$ . Palp. Terminal finger somewhat short but very wide, being 

 rather conical in shape; it seems to be a little shorter than the 

 two rod-like setie near it. Dorsal sensory finger moderately 

 developed. 



Claws of legs ending in long hairs as in T. telay-ius. 

 Measurements. (S , length 340 ; $ , 335-460 ^. 

 Host plant. Hawthorn hedges in the outskirts of Salisbury, 

 Wilts. 



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