256 THE SCOTTISH NATURALIST 



River Tay ; ? specimen, 1866, in collection of Prof. 

 W. C. M'Intosh. 



Clyde Area. — Lanarkshire : $ specimen in Kelvingrove 

 Museum, collected July 1909. 



Argyll Area. — Ben Cruachan ; $ specimen from hill-burn 

 500 feet above sea-level, 9th June 1908, in Royal 

 Scottish Museum (presented by Mr C. H. Alston). 



Kinlochleven ; $ example found in village reservoir 

 (1914), now in the collection at Millport Marine 

 Station. 



England. — No records are known to me. 



Ireland. — Lambay (Southern, 1907, p. 84); and from localities 

 in the following counties : Clare, Galway, Dublin, Meath, 

 Sligo, and Donegal (Southern, 1909, p. 116, from Cam- 

 erano, 1908). 



(2) The Large-spot^ Hairworm (Figs. 2 and 5) Farachordodes 

 tolosanus (Dujardin) (= Gordius tolosanus). 



Varies from 5 to 7 inches in length ; generally coloured a rich 

 dark brown in the male and a paler golden brown in the female. Both 

 sexes are marked by a dark band or collar with indefinite margins 

 surrounding the base of the head, the tip of which is white. Except 

 for these markings the colour is uniform and is unbroken by white 

 flecks. 



\w the two sexes the cuticle under high magnification is seen to 

 differ. Li both, however, there is an exceedingly finely marked 

 substratum, over which lies the characteristic skin pattern composed 

 of areoles (Fig. 2). The general areole is a more or less rounded 

 clear space, 12 /v. in diameter, bounded by about a dozen com- 

 paratively large refringent tubercles, on which prominent spines are 

 set (Fig. 5). In the females such areoles only are present, but 

 in the males, distinguished by their distinctly forked tail, there are 

 scattered amongst these much larger oval spaces, also bounded by 

 tubercles, but dark in colour, 30 \>. to 32 p. in length by 20 \j. to 

 25 /A in diameter, with the centre perforated by a small pore. 



This male pattern, composed of two types of areoles, closely 

 resembles that of Farachordodes piistulosi/s, which has been recorded 

 from England, but the two species can readily be distinguished by 

 reference to the characters of the forked tail. In F. pustiilosiis the 



^ In reference to ihe large, scattered Lype of areole. 



