On British Freshwater Harpactids. 185 



the front has a few transverse strise. Mesonotum closely 

 and rather stronj^ly punctured and thickly covered with short 

 fuscous puhescence. The pyramidal scutellum is more 

 sparsely punctured and is covered with long pale fuscous 

 hair; on its sides are two or three longitudinal keels or striae. 

 The basal half of the postscutelium is closely longitudinally 

 striated. Median segment closely and strongly punctured^ 

 except the areola, which is smooth and shining ; the posterior 

 median area is coarsely transversely striated, more regularly 

 at the base than elsewhere ; in the centre is a stout longi- 

 tudinal keel. Mesopleurse closely punctured, except on the 

 apex above, where it is smooth. The spiracular area, behind 

 the spiracles, coarsely obliquely striated ; the metapleurse 

 strongly and closely punctured, the punctures running into 

 striations. Abdomen uniformly coloured ; the postpetiole 

 obliquely stoutly striated in the middle; the segments are 

 closely and uniformly punctured ; the basal half of the 

 second is stoutly, longitudinally, closely striated ; the gastro- 

 coeli smooth, with curved stout strise on the basal half. 



May be known from E. ferruyinea by the abdomen being 

 entirely ferruginous. 



Layenesta ferrvyinea, Cam.* 



The male of this species agrees with the female in colo- 

 ration. It has a long and narrow abdomen, as in Erythro- 

 jojjpa ferruyinea, with which species it agrees closely in form 

 and coloration. It may be known easily from the latter 

 by the flat, not pyramidal^ scutellum. The autennse are 

 serrate. 



[To ba continued.] 



XXI. — So)ne Observations on British Freshioater Harpactids. 

 By Thomas Scott, F.L.S. 



Since tlie publication of the Monograph of the free and 

 seniiparasitic Copepoda of the British Islands by Professor 

 G. is. Brady — a work which gave a fresh impetus to the 

 study of these interesting organisms and which is indispens- 

 able to those who desire to become familiar -with the group — 

 greater attention has been devoted to the examination of the 

 freshwater forms, and a number of rare and, in some cases, 

 * Ann. & Mag. Nat. Hist. ser. 7, vol. vii. p. 377. 



