100 NEUROPTERA. 



43. Sericostoma Spencii, Steph. 111. 184, 1 ; S. Latreittii, 

 Curt. Phil. Mag. 214 ; S. collara, Pict. ; Ramb. ; 

 Kolen. ; Potamaria assimilis, Steph. 111. 183, 2 ( ? ) ; 

 P. analis, Steph. 111. 183, 1, tab. 34, 4 ( ? var. alis 

 griseo-variegatis) ; P. hyalina, Steph. 111. 183, 3 

 ( $ with the wings deprived of hairs). 



Slack ; antennas brown, not annulated ; vertex and 

 prothorax clothed with golden yellow hairs ; legs 

 brownish, tibiae and tarsi of the four posterior legs 

 testaceous ; wings clothed with golden brown hairs, 

 the posterior darker, blackish ; in the females the an- 

 terior wings are sometimes spotted with grey (vide 

 Brauer, N. A. fig. 35). 



Length 5 lin. ; exp. 9 lin. 



Hab. New Forest, Brockenhurst, West of England, 

 South Wales, Carlisle, Scotland, Devonshire, and 

 near London ; in June and July. 



I am now acquainted with eight very similar European 

 species, some of which probably occur in England. I have 

 hitherto only been able to distinguish the males with cer- 

 tainty. The best characters are furnished by the colour of 

 the antennas and legs (especially the anterior) and more par- 

 ticularly by the app. anales. Amongst the latter this applies 

 especially to two narrow sheaths, forked at the apex, situated 

 near the penis ; their proportions are very different in the 

 different species, and the English species must be tested by 

 these characters. In S. Spencii the points of the fork are 

 of different lengths, the lower being shorter. 



Genus Notidobia, Stephens. 

 Maxillary palpi of the males three-jointed, spoon-shaped. 



