Acroceridae. 163 



margin, Ihough narrow, yet slightly broader than in the male. The 

 abdoraen is more black, the pale coiour oniy forming narrow hind 

 margins of the segments, broadest on the last segments. 



Length 5 — 7 mm. 



O. gibbosiis is perhaps rarer than the preceding species; Jægerspris 

 (Schlick), at Næstved and Vordingborg ; Lolland and Falster (Schiødte) ; 

 Jutland at Silkeborg (Esben Petersen) ; it has been taken from ^"/e— "/s. 

 In habits it is chiefly similar lo the preceding species; it has been 

 taken on Salix and Alnus. 



Geographical distribution: — Northern and middle Europe from 

 the middle of Sweden to France. 



Obs. On fig. 8 cf and fig. 119 an error in the drawing has nccurred, the an- 

 tennæ being drawn with a joint too many. 



Page llii. Line 31. For ,on the first segment" read ,on the fourth segment". 



