281 



shows itself to be bounded by two low, broad, more or less curved 

 costae diverging backward. 



L. agrkola varies considerably both in size and colour. The 

 lateral spots on the cephalothorax are often very small, sometimes 

 altogether absent. From Gotland I have received a particularly 

 dark, greyish black variety. In this variety the lateral spots on 

 the cephalothorax are either very small or altogether wanting; the cen- 

 tral band is also less distinct than in the chief form of the species, 

 and its anterior (first contracted, then dilated) part has usually dis- 

 appeared. The markings of the abdomen are scarcely visible, and 

 the darker rings on the yellowish black legs are indistinct. The 

 male, as has been already said, has the tarsi of the first pair black, 

 slightly tinged with yellow at the base, the other tarsi of a uni- 

 I form yellowish colour; but the palpi are entirely black-haired, with- 

 i out any traces of white hairy covering, a circumstance, which, com- 

 bined with the unusually dark colour, makes this form a perfectly 

 distinct variety. — L. agrestis has also its varieties, larger and 

 smaller, darker or paler: one variety especially deserves to be noticed, 

 as having the central band on the cephalothorax but little, if at all, 

 dilated behind the posterior row of eyes, narrow and equably drawn 

 to a point in front, as in L. monticola and L. palnstris (tarsalix), 

 from which it is however easily distinguished by the form of the 

 vulva, which, as well as the entire form and colour of all the rest 

 of the body, is exactly the same as in the ordinary form of L. agre- 

 stis. That Westring also was acquainted with this variety, is plain 

 from his expression: "Thoracis vittse mediae amplificatio lateralis pone 

 OCulos posticos scepe dcleta." Also of L. agricola or arenaria Westr. 

 individuals occur, where the central line of the cephalothorax, after 

 rapidly narrowing in front of the middle furrow, is continued for- 

 ward as a narrow, even line, without any dilatation behind the po- 

 sterior eyes. (It is just such a variety that I, in Rec. crit. , called 

 L. agricola, erroneously imagining it to be identical with L. saccata 

 C. Koch). A form, of which I have found several females at Upsala 

 and Pyrmont, has yellowish grey legs, with scarcely any traces of 

 the darker rings, the central line of the cephalothorax narrow and 

 uniformly pointed, but the lateral bands, vulva etc. exactly as in 

 L. agi'estis, of which it is assuredly only a variety. 



Very nearly allied to L. agricola both in form and colour, 

 is L. amnicola L. Koch (loc. cit., p. 41): the male is however ea- 

 sily distinguished from L. agricola (f by having all the tarsi of 



