^^Q^^and Si/stemaiic Arrangement of British Sj^ideiy.^y^ 399 



Blackw. Linn. Trans, vol. xix. p. 120; Koch, Die Arachn. 



B. xiv. p. UG. tab. 485. fig. 1352, 1353. 

 Dolomedes limhatus, Halin, Die Arachn. B. i. p. 15. tab. 4. fig. 11. 

 —T- marginatus, Ilahn, Die Arachn. B. i. p. 15. tab. 4. fig. 12. 



In the fens of Cambridgeshire, this fine spicier, which presents 

 remarkable difierences of colour in its several stages of growth, 

 is of frequent occurrence. Like Lycosa piratica, it descends 

 spontaneously beneath the surface of water, the period of time 

 during which it can respire when immersed depending upon the 

 supply of air enveloping its body. In May the female deposits 

 several hundred eggs in a globular cocoon of brown silk of a 

 compact texture, measuring |ths of an inch in diameter, which 

 she carries under the sternum, supporting it there by the instru- 

 mentality of the falces and palpi. 



The Dolomedes limbatus and Dolomedes marginatus of M, Hahn 

 arc immature individuals of this species. See the synonyraa. 



Genus Hecaerge, Blackw. 



■di •^Is-jo 



' r " 18. Hecaerge spinimana. 



'Hecaerge maculata, Blackw. Lend, and Edinb. Phil. Mag. Third 

 Series, vol. iii. p. 193 ; Researches in Zoology, p. 413. pi. 3. 

 fig. 8. 



Lyccena spinimana, Sund. Vet. Acad. Handl. 1832, p. 266. 



Lycodia spinimana, Sund. Conspectus Arachnidum, p. 22. 



Bolomedes lyccBna, Walck. Hist. Nat. des Insect. Apt., t. i. p. 348. 



Zora«pemV«anfir, Koch, Die Arachn. B. xiv. p. 102. tab. 481. fig. 1343, 

 1344. 



Hecaerge spinimana occurs in woods in various parts of Great 

 Britain ; it is active in its movements, and being provided with, a 

 small scopula or climbing apparatus at the extremity of each 

 tarsus, can run with facility on diy objects having polished per- 

 pendicular surfaces. Tn June the female constructs a lenticular 

 cocoon of white silk of a slight texture, measuring about y^ths 

 of an inch in diameter, which she usually attaches to the under 

 side of g, stone, depositing in it between 20 and 30 sphe? ical eggs 

 of a yellowish white colour, not agglutinated together. 



In its general organization this species approximates most 

 nearly to the spiders belonging to the genus Dolomedes, among 

 which it is still retained by M. Walckenaer (see the synonyma) ; 

 the propriety of constituting a new genus for its reception is 

 rendered sufficiently manifest, however, by difierences in the dis- 

 position, of its eyes, in the structure of its mouth and. legs, and 

 also in its habits and oeconomy. These differences present distinct 

 characters admitted to bes generic by Professor Sundevall and M. 

 Koch : indeed the generic name l4ic<gm,. pooposed bv the former 



