20 NEUROPTERA. 



On a comparison of the types I have noted their identity 

 as above ; the description is made from Enghsh specimens 

 which have not been compared with the types. P, hrunneus, 

 Pictet, Ephem. 217, 6, tab. 27. 



Imago. Head and thorax shining pitchy-black ; abdo- 

 men brown, the middle segments rather paler in the 

 middle at the base ; anal forceps brown ; caudal fila- 

 ments pale, the joints with darker annulations ; legs 

 pale-yellow, the anterior legs brown, the femora black. 

 Wings hyaline ; the posterior very small ; venation 

 very fine, the veins near the costa yellowish, in the 

 apex of the marginal field are six straight, rather 

 darker transverse veins. 

 Female similar to the male ; egg- valve quadrate, a rec- 

 tangular incision goes more than half the length and 

 makes it two-pointed. 

 Length of the body ^ 2|, $ 3 fines ; expansion of the 



wings ^ 6|, 2 6| lines ; setae <J 5|, $ 4J fines. 

 Habitat Hertford in June. 



The description of Ephemera fusca suits very well. Ejih. 

 rosea is probably discoloured ; B. obscura certainly appears 

 to belong here. With reference to Ephemera rufescens^ 

 comparison should be made with P. erythrojyhthalmus, 



5. P. ci>XTUs, De Geer; Pictet, Ephem. 219, 7, tab. 28; 

 Ej^h. diLbittf Stephens, 59, 15 ^. 

 Imago. Head and thorax shining black-brown ; the 

 upper segment of the eyes red ; abdomen snow-white, 

 the first and the three last segments black ; anal for- 

 ceps and caudal filaments white ; legs white ; femora 

 of the anterior legs and the tips of the tibiae black- 

 brown ; wings hyaline, the posterior very small ; vena- 



