136 MANDIBULATA. — XEUROFTERA. 



Not common in the metropolitan district : it has occurred near 

 Sydenham, on the banks of the Croydon Canal ; but in the north of 

 England, and in several parts of Scotland, it appears to abound in 

 June and the beginning of July : it is, in common with other species 

 the genus, a favourite food of trout. 



Sp. 2. cephalotes. Fusca, capita lato ochraceo-maculato, ihorace transverso- 

 quadrato, rugoso, antennis setisqve brevibus. (Long. corp. $ 5 — 6§lin. j 

 9 6—8 I'm. ; Exp. Alar, $ 9 lin.; 9 1 unc. 10 lin.— 2 unc. 4 lin.) 



Pe. cephalotes. Curtis, v. iv. pi. 100. — Steph. Catal. 315. No. 3536. 



FuscouSj shining : head broader than the thorax, with its base and a transverse 

 streak between the eyes ochreous ; thorax transverse-quadrate, rugged, with 

 a central dorsal channel, having an elevated line on each side curved out- 

 wards ; abdomen ochreous at the tip, of the females frequently entirely so ; 

 setse not so long as the antennae, which are rather short: wings fuscescent, 

 with a greenish tinge in the females ; nervures fuscous, the fourth discoidal 

 areolet of the posterior pair mostly with two transverse nervures at the 

 apex. Pupa fuscous. 



Found on the borders of the lakes in Cumberland and Westmore- 

 land ; also in Scotland in June ; but I believe not within the metro- 

 politan district. 



Sp. 3. bicaudata. Fusca, capite thoraceque lined longitudinali fulva. (Long, 

 corp. $ 8 lin. ; 9 5 — 7 lin.; Exp. Alar. $ 8 lin.; 9 1 unc. 4 — 6 lin.) 



Ph. bicaudata. Linne. — Pe. bicaudata. Steph. Catal. 315. No. 3537. 



Fuscous : head with an irregular longitudinal tawny or orange streak behind; 

 thorax transverse, rugged, with a transverse impressed line in front, and a 

 longitudinal channel, bordered on each side by a raised line, the space 

 between which is tawny or orange, forming a longitudinal streak of that 

 colour ; abdomen ochreous beneath ; setee nearly as long as the body, 

 stoutish ; antennae as long as the setae ; wings fuscescent, with darker 

 nervures. 



Var. j8. Pe. nervosa. Steph. Catal. 315. N'o. 3538.— With the wings broader, 

 of a deeper hue, with very dark and distinct nervures. 



Found occasionally in June, on the banks of the Thames, near 

 London, as at Fulham, Battersea, Hammersmith, &c. ; also in the 

 north of England and in Devonshire. 



Genus XXVII.— ISOGENUS, Newman. 



Antennw remote, slender, shorter than the body, composed of numerous 

 remote articulations, the two basal joints largest, the remainder gradually 



