66 



THE SCOTTISH NATURALIST 



incompletely anchylosed. Second pair small, their posterior 

 margins with those of the first pair almost describing an arc. 

 Third pair narrow, outer half of anterior margin with a hyaline 

 subcutaneous edge. Fourth pair with the outer half broad, 

 contracting in the inner half to about two-thirds of the width. 

 Inner half of posterior margin with a hyaline subcutaneous 

 edge passing round to part of the inner margin. 

 Legs. Fi rs t pair -90 mm.; second pair 1-09 mm. ; third pair 1-14 

 mm.; fourth pair 1-48 mm. in length. Swimming hairs long 

 and slender, relatively few in number. On flexor surface a 

 considerable number of shorter and stouter hairs arranged 







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Arrhenurus freemani . i epimeia and genital area. 



along the segments, or grouped in small clusters, chiefly on 

 proximal segments of longer limbs. On the extensor surface of 

 all segments, except sixth of fourth pair of legs, a row of short 

 hairs, curved in the proximal segments, straighter and more 

 adpressed in the distal. Each double claw bifid. 



Genital area having a considerable resemblance to that of A. 

 caudatus (Geer) $ . Chitinous outer ring of the genital labia 

 thin, rounded; posterior portion rather flatter; attachment to 

 the lateral plates narrow. Plates nearly twice as long as broad, 

 slightly tapered to the outer end ; corners rounded. Acetabula 

 small and numerous. 



Anus lying close up to posterior body margin. 



Distribution. Ireland : 



Scotland : near Bangour, W. Lothian. 



