I40 THE SCOTTISH NATURALIST 



'a. Surface pattern consisting of numerous tubercles bordering 

 (A) small oval or roundish clear spaces, and (B) much 

 larger, scattered, dark spaces, irregularly oval in shape, 

 and without any dividing line ; posterior end bifurcated ; 

 precloacal bristles set in two rows, forming a horse- 

 shoe shaped arch behind the concavity of which lies 

 the cloaca (Fig. 2) . , . . Parachordodes iolosanus 



(male specimen). 

 , Surface pattern consisting of numerous tubercles bordering 

 (A) small polygonal or roundish clear spaces, and (B) 

 much larger, scattered, dark spaces, polygonal in shape, 

 and divided into two or more polygonal compartments 

 by clear lines ; in male, precloacal bristles set in two 



'\^ rows which converge at an angle . . Parachordodes pitstulosus 



III. Descriptions and Distribution of Scottish 



Hairworms. 



In the following account short descriptions are given 

 of Scottish Hairworms, to supplement the summary of 

 characters in the key. There also appear, in tabular form 

 for reference, lists of the localities in the British Isles from 

 which definite specific records of Gordiidae are available. 

 Naturally the list is more complete as regards Scottish 

 distribution, for during several years I have made efforts 

 to obtain for examination individuals from widely scattered 

 districts in this country. 



The results, due in great part to the interest of the 

 many naturalists who have collected specimens for me, 

 form a definite foundation from which future distributional 

 investigations may proceed. In place of two species of 

 Scottish Hairworms, four are now known, one of which 

 {Parachordodes pleskei, a new record for the British Isles and 

 for Europe) has not hitherto been found outside the limits 

 of China. Further, in place of two solitary localities (both in 

 Berwickshire) from which specifically determined Hairworms 

 were recorded, we have now a list which probably gives in 

 skeleton the general distribution, and indicates the frequency 

 of occurrence of the various species in Scotland. From this 

 it is apparent that the most common Scottish Hairworm is 

 Parachordodes violaceus, a form widely distributed in all 

 southern Scotland, from the Borders to Argyllshire and 



