66 



Linyphia arcuata Thor. or L. pygmcea Westk. is certainly the 

 same spider, which Eeuss has described under the name of L. tene- 

 bricola. In this species the abdomen is said to be dark brownish grey, 

 with a row of light angular lines on the upper part, and tivo round- 

 ed white spots on the sides, one in the middle of the side, the 

 other near the spinners — a description, which exactly suits the 

 species now before us, but not L. alacris Blackw., which Westring 

 has described under the name of L. tenebricola. Both L. tenehrieola 

 Westr. and L. pygmcea id. are probably included in the L. terricola 

 of C. Koch: on this subject vid. p. 57, L. tenebricola Westr. 



Blackwall's L. terricola I cannot distinguish from Westring's L. 

 pygmcea or L. tenebricola Eeuss. The armature of the legs (see We- 

 string's description!), as also the structure of the organs of copidation , 

 is, as far as I have been able to see, absolutely the same in both, and 

 only the colour, which however varies much , appears to be in general 

 somewhat lighter in the English "L. terricola"; this form has on 

 the sides of the abdomen a longitudinal yellowish band , which how- 

 ever is often broken in two, or replaced by two rounded spots, as in 

 most of my Swedish specimens of L. tenebricola. In cf of this latter 

 form, the cephalothorax is in general dark, blackish, and the abdo- 

 men not only on the underside, but also above, very dark, almost 

 black, generally without any lighter design: in Blackwall's L. terri- 

 cola cf the cephalothorax is in general greyish yellow, with a fine 

 black border; the upper part of the abdomen is of the same light 

 ground-colour as in the female, with a row of dark angular lines, 

 and blackish on the underside. — The L. temds (or L. pusilla) of 

 Blackw all, of which species, as well as of L. terricola Blackw., I 

 have received specimens, determined by Blackwall himself , from the 

 Kev. Mr. Cambridge, is certainly not specifically different from L. 

 tenebricola Eeuss and L. terricola Blackw.; the specimens I possess of 

 L. temds appear to be distinguished from L. terricola Blackw. only 

 by having the dark angular lines on the upper part of the abdomen 

 more or less strongly dilated at the extremities, or even interrupted 

 in the middle, in which case they form a double row of blackish 

 spots along the back. — Both of "L. pygmcea" Westr., "L. terricola" 

 Blackw. and "L. tenuis" id., I have myself captured specimens in 

 various parts of Germany; a ? with the abdomen of an almost uni- 

 form brownish colour has been captured in Skane by Dr. T. Tullberg. 



In L. tenebricola Eeuss, nob., or L. pygmcea Westr., the fema- 

 le's vulva, seen from the side, forms a generally strong protuberance, 



