ON SOME RARE ARACHNIDS 59 



distinguished from the fact that those of the latter species are 

 described as possessing a pair of lateral processes springing 

 from the labium and separating the maxillae of each side from 

 the anterior border of the sternum. Such are completely 

 absent in /. velox. The females are distinguished by the 

 spiny armature of the anterior femora. These joints bear 

 some long, strong, spines on the inner side near the apex. 

 There are three of these in the females of /. actileafus, and 

 two only in the present species. M. Simon kindly examined 

 my specimens. He informed me as to the difference in 

 the females, and stated that in his opinion the present 

 specimens belonged to an undescribed species. It has 

 been found, as before stated, in London, Chester, and 

 Alnwick, and is thus at least wide-spread in Britain. The 

 fact that individuals of all ages were found shows that it is 

 breeding in this country. It is almost certain that it would be 

 found in other localities if hot greenhouses were investigated. 

 It is, of course, not indigenous to this country, but appears to 

 be obtaining a footing here ; at any rate it is as much of a 

 native as Hasarius adansonii (Sav.) and possibly Theridioti 

 tepidarioriDii (C. L. Koch) and Pholcns phalangioides (Fuess.) 

 It is so unlike anything else we possess, and so interesting in 

 its structure, that I have ventured to deal with it more fully 

 than would have been the case had it been more common- 

 place. 



Bianor senescens (Sim.) Plate IV., figs, i, 2, 3 and 30 d. 



Mr. W. H. Bennett obtained two females of this interesting 

 spider by sweeping herbage near Hedley in Surrey during 

 June, 1907. The species has occurred in France, Germany, 

 Poland, Galicia, and Sweden, but this is its first British record. 

 The spider is of a somewhat elongated form, and of a dark 

 grey colour. Under the microscope it is seen to be covered 

 with a coating of short, somewhat squamous, hoary hairs. 

 The abdomen above sliows a very indistinct median pattern. 

 This consists of a central fascia with three or four consecutive 

 lateral processes. Between these processes are a series of 



