233 



I have received from the late Dr. Ohlert under the name of X. lanio 

 an entirely different male spider: a similar r? has also been found 

 by Mr Eisen in Skane, and it appears to me probable, that this is 

 just the male to the female called by Westring Thomisus lanio. I 

 call this spider X. impavidus (see above, p. 230, the foot-note). It 

 is easily distinguished from A', lateralis, or X. lanio C. et L. Koch, 

 not only by its colour, its dark palpus-lamina and its more consider- 

 able size, but especially by the form of the processes on the under 

 side of the bulbus, which are both strong and of nearly equal length, 

 the interior directed almost accurately downwards, but somewhat 

 inwards and forwards, compressed and somewhat dilated towards the 

 slightly inwards curved extremity; the other process, which has at its 

 base a strong tooth pointing forwards, is sharp and directed at first 

 downwards, but afterwards curved backwards and inwards, towards 

 the firstnamed process. In size and colour X impavidus bears a 

 close resemblance to X. bifasciatus cf, from which it may however 

 without the least difficulty be distinguished by the palpi (see Thorn, 

 bifasciatus Westr. further on). Ohlert has, as I perceive by the 

 specimens he has sent me, confounded this X. impavidus with X. 

 viaticus C. Koch or X. Kochii Thor. (concerning which more under 

 Thom. cristatus Westr.), in which the processes of the bulbus are 

 very similar to those of X. impavidus; but they are in X. Kochii 

 directed inwards and somewhat forwards, and the posterior process 

 is strongly and rapidly curved, so that it externally forms an angle 

 or corner, and has almost the form of a boot. — Another species 

 that appears to be nearly related to X. impavidus, is X. luctator 

 L Koch '), but in this species the two processes on the under side 

 of the bulbus are said to cross each other, and the back one to be 

 "am Ende kurz gespalten," which is not the case in X. impavidui. 



Thom. lanio Westr., which I conceive to be the female to X. 

 hnpavidus, is, as may be seen from his description, considerably 

 larger and darker-coloured than the female of the true A", lanio or 

 X. lateralis (Hahn). The length of the tibia and patella together is 

 5 millim.; in A\ lateralis $ it is not more than about 4 millim. 

 What particularly distinguishes this X. impavidus V is, that the 

 forehead is almost semicircularly rounded off, not truncated, as in 

 the related species (Conf. Westr., Aran. Suec , p. 413); the great 

 number of short spines on the under side of the anterior tibiae and 



l) Beitr. z. Kenntn. <1. Arachn. -fauna Galiziens, p. 29. 



