ON NEW AND RARE ARACHNIDS. 45 



Kulczynski, and their absence, even though there may be 

 a row of small dots on each side, denotes Kulczynski's T. 

 oblongus. Immature examples may be thus distinguished 

 as well as the adults. Since arriving at the above con- 

 clusions I have been able to refer to a paper by Professor 

 Kulczynski, in which he also notes the two spots on 

 the abdomen as distinctive of the two forms. It becomes 

 now a question as to which of the two forms the T. 

 oblongus of Blackwall (who is our first recorder of a 

 British species) may be relegated. It appears to me that 

 the T. oblongus of Blackwall is undoubtedly the T. 

 parallelus of Kulczynski, his figures (and the type 

 specimens from which they were drawn, and which are in 

 my possession) plainly . show the two abdominal spots, 

 although both the sexes he figures are immature. The 

 complete and certain elucidation of the various synonyma 

 of Tibellus oblongus, Walck., and others would be a very 

 difficult task, and in the absence of typical examples 

 examined by those specialists who have included them 

 under the one form or the other of the two species now 

 recognised, it would probably be impossible. Walckenaer, 

 to whom the first description of T. (Philodromus) oblongus, 

 is due, plainly notes the presence of the two distinctive 

 abdominal spots ; and we may, therefore, take it as fairly 

 certain that the spider named parallelus by Kulczynski 

 must be included as synonymous with Blackwall's T. 

 oblongus, which would thus be rightly given as T. oblongus 

 Walckenaer. What, then, is our other British form in 

 which the two critical abdominal spots are absent ? It is 

 certainly as it seems to me, the T. oblongus of Kulczynski ; 

 but it cannot bear that specific name as it differs from 

 Walckenaer's form in the absence of the spots ! The 

 species which Kulczynski includes as synonymic with his 

 oblongus, viz., T. maritimus , Menge, male, would appear to 

 be the form which (also on other grounds than those of 

 the abdominal markings) we have now to include in our 

 British List. Our British forms would, therefore, now 



