and Systematic Arrangement of British Spiders. 253 



M. Walckenaer does not admit the validity of the well-defined 

 genus Oonops (misprinted Conops), but has placed this spider in 

 the genus Dysdera. See the synonyma. 



Oonops pulcher occupies interstices in rocks and walls, and 

 among lichens growing on trees, in Lancashire, Denbighshire 

 and Caernarvonshire, being abundant in the wooded parts of the 

 last two counties. By the agency of a small scopula, connected 

 with the extremity of each tarsus, it is enabled to move with 

 celerity and security on dry objects having polished perpendi- 

 cular surfaces. In May the female fabricates near her retreat 

 several contiguous subglobose cocoons of white silk of a delicate 

 but compact texture, measuring about y^^th of an inch in dia- 

 meter, in each of which she usually deposits two spherical pink 

 eggs, not cemented together. 



Family Scytodida. 



Genus Scytodes, Latr. 



209. Scytodes thoracica. 



Scytodes thoracica, Walek. Hist. Nat. des Insect. Apt. t. i. p. 270 ; 



Latr. Gen. Crust, et Insect, tom. i. p. 99. 

 tigrina, Koch, Die Arachn. B. v. p. 87. tab. 167. %. 398. 



Dr. Leach has stated in the Supplement to the 4th, 5th and 

 6th editions of the ' Encyclopaedia Britannica,' article Annulosa, 

 that Scytodes thoracica has occurred twice near Dover ; but that 

 both individuals were females. 



Genus Savignia, Blackw. 



, 210. Savignia frontata. 



Savignia/rontata, Blackw. Lend, and Edinb. Phil. Mag. Third Series, 

 vol. iii. p. 105 ; Research, in Zool. p. 312. pi. 2. fig. 1, 2. 



The male of this small and interesting species was discovered 

 on iron rails at Crumpsall Hall in the autumn of 1832, and has 

 since been met with, at different seasons of the year, in various 

 parts of Lancashire, Yorkshire, Cheshire, Denbighshire and Caer- 

 narvonshire. As regards its oeconomy, I can merely state that 

 it is active during the day, decidedly aeronautic, making frequent 

 ascents into the atmosphere, and that it can exist for a long period 

 immersed in water. Though the male is far from being uncom- 

 mon, yet I have not succeeded in capturing a single female. 



By the conical protuberance on the anterior part of the ce- 

 phalo-thorax, the relative length of the legs, the converging 

 maxillse and semicircular lip, Savignia frontata is connected with 

 the spiders belonging to the genera Walckena'era and Neriene. 



