214 



Mr. R. Gui-ney on the British Species 



M^ is simple; it is very faint, and the edge of the wing is 

 folded over at the point where a brancli mi^ht be. 



Fig. 2. 



Eophlcbotomus connectons, sp, u. 



XXVI. — The British Species of the Opepod Genus Nitocra^ 

 Boeck, By Robert GurneYj M.A, 



The species of the genus Nitocra, hitherto recorded as 

 British, are — N. hibernica (Brady), N. palustris (Brady), 

 JV. palustris, var. elongata, Scott, N. simplex, Schmeil"^^ 

 N. otiyochaia, Giesb., and N. {Aineira) amphibia, Brady. 

 Of these iV. hibernica is a purely fresh- water species, quite 

 distinct from the rest, and JV. simplex is also undoubtedly 

 a distinct species ; but, concerning the remaining species, 

 there is some confusion as regards their validity and relation- 

 ship to one another. Prof. Sars, in his ' Crustacea of Norway,' 

 has treated N. palustris, N. olipochata, and Ameira amphibia 

 as synonyms of A^. typica, Boeck, while he regards A^. palus- 

 tris, var. elongata, Scott, as identical with N. sj)inipes, Boeck. 

 With regard to N. oligocli(sta and A. amphibia, he is 

 unquestionably right, but some uncertainty remains about 

 N. palustris (Brady). Having recently met with the species 

 attributed by Prof. Sars to N. spinipes, Boeck, I Avas led 

 to re-examine specimens which 1 had previously referred to 

 N, palustris, and found that, in all cases, these specimens 

 were properly to be referred to N. njjinipes. This species is 



* Ann. & Mag. Nat. Hist. (9) v. p. 3oG (1920). 



