SCOTTISH HAIRWORMS 257 



copulatory " bristles " arc arranged on either side and in advance of 

 the cloacal opening, as in P. violaceus (Fig. 7), two series converging 

 so as to form the two sides of a triangle ; whereas in P. tolosanus 

 the rows of projections are arranged in advance of the cloacal 

 opening in a half-moon or horse-shoe shape. The female of 

 P. tolosanus, in which only one type of cuticular areole is present, 

 may further be distinguished from the females of any British species 

 by its abruptly terminated posterior end, furrowed by a deep groove 

 in which lies the cloacal opening. This groove, which is distinct 

 from the bifurcation in the posterior of males, is bordered by 

 a couple of swellings. These, according to Romer (1896, p. 293), 

 at first allow of a broad and shallow intervening furrow, which with 

 growth gradually becomes narrower and deeper. 



Distribution. — The species is European in range, having been 

 recorded, according to Camerano, from the British Isles, Germany, 

 France, Italy, Galicia, Bohemia. 



In the British Isles the records are from : — 



Scotland.^ — Tweed Area. — Berwickshire: ,^ and 9 (Baird, 

 i853> P- 36). 



England and Wales. — Somersetshire, Wiveliscombe : $ 

 (Baird, 1853, p. 36). 



Ireland. — -No records. 



(3) The Lined Hairworm (Fig. i) Parachordodes pleskei 



(Camerano). 



The occurrence in Scotland of a specimen which agrees with the 

 published descriptions of this species is of great interest ; for not 

 only does the record add a species to the known fauna of Scotland 

 and of the British Isles, but it also shows that in the western limits 

 of the Old World there exists a species hitherto recorded only from 

 its eastern bounds in northern China. The species is also new to 

 the fauna of Europe. 



The single specimen examined by me was a male, 140 mm. in 

 length and 0.5 mm. in diameter. In colour it was of a uniform rich 

 yellow brown (close to the " Argus brown " of Ridgway's Color 

 Standards and Color Mo/nenclator, 1912), with this exception, 



^ As I have not been fortunate enough to olHain Scottish or British examples 

 of this species, the above description and the figures are founded on the examina- 

 tion of specimens received from Germany. 



44 2D 



