22 NEUROPTERA. 



tinguishing characters of P. erythrophthalmus, and have 

 probably been in error in referring E. rufescens to P.fusciis. 



The description is made from EngHsh specimens, which 

 however I have not compared with the types. 



Possibly B. cmtumnalis, Stephens, 67, 17, of which the 

 description is only copied from Curtis, also belongs here ; 

 onlv as a JBa'etis it should have onlv two caudal filaments. 



BAETIS, Leach, Stephens. 



Head rather long ; eyes simple, in the male large, conical, 

 almost confluent; in the female far apart; wings four, the 

 posterior wings hardly one-fourth the size of the anterior 

 wings ; venation considerable and distinct ; the males witli 

 long four -jointed anal forceps; penis furcate, securiform; 

 egg-valve short, broad ; two long caudal filaments. 



Larva short, flat and broad ; mandibles slight ; branchial 

 tufts on the side of each segment but the last ; caudal fila- 

 ments fringed. They swim freely or hide under stones in 

 rapid streams. 



1. B. VENOSA, F. ; Pictet, Ephem. 167, 2, tab. 20, 1 ; 

 B. dispavy Stephens, 63, 1, $ imago ; Curtis, Brit. 

 Ent. fol. 484 ; B. venosa, Stephens, 63, 2, $ imago. 

 Imago. Head and thorax shining chestnut- brown ; 

 abdomen yellowish-brown ; the tips of the segments 

 with broad dark-brown margins ; anal forceps black- 

 brown ; caudal filaments very long, brown, at the 

 base black-brown ; wings hyaline, yellowish towards 

 the base ; costa yellowish, apical half of the wings 

 brown, with irregular double cells in the marginal 

 field ; legs pale brown, tarsi darker ; anterior legs 

 bJack-brown. Female of similar colouring, but the 



