334 Mr. J. Blackwall on the Structure, Functions, (Economy, 



my possession until some months had elapsed after the publica- 

 tion of my description of this species in the ' Annals and Maga- 

 zine of Natural History/ I was not aware that in announcing it 

 as new to arachnologists I had been anticipated ; however, such 

 being the case, the specific name atrica, conferred upon it by 

 M. Koch, must take precedence of that of sceva, which will follow 

 as a synonym. 



80. Tegenaria civilis. 



Tegenaria civilis, Walek. Hist. Nat. des Insect. Apt. t. ii. p. 7. pi. 16. 

 fig. 1 ; Koch, Die Arachn. B. viii. p. 37. tab. 264. fig. 618, 619. 



domestica, Koch, Uebers. des Arachn. Syst. erstes Heft, p. 13. 



Agelena civilis, Sund. Vet. Acad. Handl. 1831, p. 127. 

 Titulus\7, Lister, Hist. Animal. Angl. De Aran. p. 59. tab. 1. fig. 17. 



The habits and oeconomy of this common spider are very 

 similar to those of Tegenaria domestica, for which it has frequently 

 been mistaken, even naturalists of high authority having included 

 references to Lister's description and figure of it among the 

 synonyma of that species. During the summer and autumn the 

 female constructs several lenticular cocoons of white silk of a 

 fine texture, measuring about f^ths of an inch in diameter, in 

 each of which she deposits from fifty to sixty spherical eggs of 

 a yellowish white colour, not adherent among themselves ; these 

 cocoons are attached to walls, or other objects in the vicinity of 

 her web, and have generally particles of plaster, whitewash, or 

 mortar disposed on their exterior surface. 



I have ascertained the following remarkable physiological facts 

 in connexion with Tegenaria civilis by observation and experi- 

 ment; namely, that both sexes change their integument nine 

 times before they arrive at maturity, once in the cocoon and 

 eight times after quitting it ; that a leg of a young individual 

 detached at the coxa six times consecutively may be reproduced 

 at each succeeding change of integument after the infliction of 

 the injury ; that the life of this species extends through a period 

 of four years ; that the sexual organs of the male are connected 

 with the digital joint of the palpi ; and that the female, after 

 impregnation, is capable of producing nine sets of prolific eggs 

 in succession without renewing her intercourse with the male, 

 more than two years elapsing before all are deposited, and ten 

 months nearly intervening sometimes between the deposition of 

 two consecutive sets. 



Genus C^elotes, Blackw. 



81. Ccdotes saxatilis. 



Ccelotes saxatilis, Blackw. Linn. Trans, vol. xviii. p. 618. tab. 39. 

 fig. 6-8. 



