340 



1848. Trochosa umbraticola C. Koch, Die Arachn., XIV, p. 137, Tab. 



CCCCXCI, fig. 1368. 

 1851. Lycosa piscatoria Westr., Forteckn. etc., p. 54. 

 1856. Potamia „ Thor., Eec. crit. Aran., p. 64. 

 1871. Lycosa de greyii Cambr., Descr. of some Brit. Spid., cet., in 



Transact, of the Linn. Soc, XXVII, p. 396, 



PI. 54, no. 3. 



The spider, to which Clerck: has given the name of Ar. pisca- 

 torius and which Westring has here described, is widely different 

 from the species, which Blackwall and C. Koch call L. piscatoria. 

 From these as well as from P. piraticus, under which it is taken 

 up by, for instance, Walckenaer (H. N. d. Ins. Apt., I, p. 339), 

 P. piscatorius (Clerck) is distinguished by its more considerable size, 

 as well as by its short legs etc. In the female the cephalothorax 

 attains a length of more than 5 millim. (nevertheless smaller indi- 

 viduals are often met with: I have for instance one, in which the 

 cephalothorax is hardly 4 millim. long), and is equal in length to the 

 tibia + patella of the 4 th pair; its breadth somewhat exceeds the 

 length of the tibia of that pair: the mandibles are as long as the 

 metatarsi of the 1 st pair; the legs of the 4 th pair are about 3 % times 

 as long as the cephalothorax. The first row of eyes is visibly longer 

 than the second row : its centre eyes are considerably larger than the 

 lateral, and are situated rather farther from each other than from 

 the lateral eyes, and are not much smaller than the two eyes of 

 the third row. The sternum is of a darker or paler yellowish brown, 

 with darker margin. The rusty-yellow, spear-shaped spot on the 

 fore part of the abdomen is sometimes wanting (as in Clerck's figure 

 and in the (dried) type-specimens to Westring's and my own above- 

 cited descriptions), but in a number of specimens collected in Skane 

 partly by Mr Both, and communicated by Brof. Wahlgren of Lund, 

 and partly by Mr Eisen , that spot is as conspicuous as on C. Koch's 

 figure, or as in the Bavarian specimens which I have received from 

 L. Koch under the name of Troch. umbraticola C. Koch : it has usu- 

 ally a little tooth or angle on each side near the middle. The vulva 

 is composed of two small, blackish, crescent-shaped, inward- and 

 forward- curved costs, each bending round a little protuberance situ- 

 ated immediately within it. The full-grown male is unknown to 

 me: but Mr Cambridge, to whom I have sent a j, agrees with me 

 in considering it to be the same species, the male of which has 

 been described by him (loc. cit.) under the name L. de Greyii. 



