47 



gnatha, and which he supposes to have been confounded together 

 under the designation of L. triangularis, it appears to me that L. 

 macrognatha is identical with the real L. triangularis (Clerck), where- 

 as L. micrognatha has never, as far as I am aware, been found in 

 Sweden. Menge's descriptions indeed, both of the to me unknown 

 L. micrognatha and of L. macrognatha, are so far deficient that in 

 describing the mandibles, on the different structure of which the 

 difference between the two forms seems principally to depend, nothing 

 is said of the dissimilarities that exist in these organs between the 

 two sexes. The description of the mandibles of L. macrognatha 

 applies accurately to the male of L. triangularis , but not to the 

 female, whose mandibles, as is known, have an appearance entirely 

 different from that of the male's. In all the male specimens I have 

 seen, the united length of the mandible and its claw are (as in 

 L. macrognatha cf) greater than the length of the cephalothorax 

 or of the palpus — which is also seen in Clekck's figure PI. 3, 

 Tab. 2, fig. 1 — and the claw is almost straight or slightly sinu- 

 ated in the middle. In the female on the contrary the length of 

 the mandible together with the claw is something less than that of 

 the cephalothorax, and the claw is uniformly curved, as is said to 

 be the case in L. micrognatha, both cf and $, in contradistinction 

 to L. macrognatha. According however to Menge's measures, the 

 length of the mandible + the claw in the female of this last is not 

 greater than, but only equal to that of the cephalothorax. — The 

 mandible in /,. triangularis cT is at the base slightly, outwards not 

 at all thicker than the thighs of the I s * pair of legs: without the claw 

 it is, at least sometimes (in dried specimens), as long as the tarsi of 

 that pair, as Westring states, but which Menge seems to deny to 

 be the case in his L. macrognatha. — 71. micrognatha appears to me 

 to be nothing more than a variety (or rather race) of L. macro- 

 gnatha or triangularis. 



Lin. triangularis Ohlert (Aran. d. Prov. Preuss., p. 44), of 

 which Ohlert himself has sent me specimens, is a totally different 

 species, and identical with L. emphana Walck. (= 71. scalarifera 

 Menge '))• This species , of which I captured a couple of specimens 

 (females) at Pyrmont, but which has not hitherto been met with in 

 Sweden , is easily distinguished both from L. triangularis (Clerck) and 

 L. marginata C. Koch, by the circumstance, among others, that the 



1) Preuss. Spinn., I, p. 110, PI. 19, tab. 37. 



