14 NEUROPTERA. 



that they could hardly have escaped the observation of 

 English naturalists. 



EPHEMERA, Linne. 



Head moderately broad ; eyes simple, semi-conical, rather 

 large, far apart ; wings four, with numerous transverse veins ; 

 the anal forceps of the male is long and four-jointed; the 

 penis is double, like a fork; egg-valve hardly present; three 

 long caudal filaments of equal length ; the first tarsal joint 

 very short. 



Larva long, round ; head two-pointed ; mandibles ensiform. 

 curved upwards. Legs flat, the anterior legs fitted for bur- 

 rowing, on each side are six tufts of branchiae. 



The larvae live in the banks of sluggish streams. 



L E. VULGATA, Linne; Stephens, 55, 1. 



Imago. Head and thorax shining dark black-brown ; 

 mouth beneath yellow ; antennae black-brown, the 

 apex of the bristle whitish; abdomen yellowish- 

 brown, with two black longitudinal streaks on the 

 back, these expand externally at the base of each 

 segment, so as to form a row of triangular spots ; 

 between these streaks are two black longitudinal 

 streaks on each segment; anal forceps yellowish- 

 brown; caudal filaments of the same colour, the 

 joints annulated a little darker; legs yellowish-brown ; 

 fernora and tibiae of the anterior legs black. Wings 

 smoky-brown, with a hyaline spot at the base, trans- 

 vej'se veins generally margined with brown ; marginal 

 field of the anterior wings and a broader mai'gin on 

 the posterior wings darker; in the middle of the 

 anterior wings near the costa are three or four qua- 

 drate brown spots, and a single one near the base ; in 



