26 



Tho following attempt at a tabular arrangement of the genera, 

 according to my views, may be useful. 



A. — With a transverse vein towards the middle of the costal mar- 

 gin of the anterior wings, uniting the costa and sub-costa. 

 «• — Anterior branch of the ramus discoidalis (first-apical sec- 

 tor) in anterior wings, forming a forked cell on the apical 

 margin. 

 h. — Posterior wings broad ; the anal portion well developed ; 

 costal margin slightly concave. 

 c. — Intermediate legs of the female not dilated. — Plectroc- 



nemia. 

 cc. — Intermediate legs of the female dilated. — Polycen- 

 tropus. 

 hi. — Posterior wings narrow, especially at the base ; costal 

 margin with a slight elevation near the middle. — Ecnomus. 

 aa. — Anterior branch of the ramus discoidalis in anterior wings, 

 simple, not forked. — Cyrnus. 

 A. A.. — Without a transverse vein uniting the cosia and sub-costa 

 near the middle. — JVeureclipsis. 



PLECTKOCNEMiA — Stephens. 



The single described species of this genus has great analogies with 

 Polycentropus, and differs chiefly in the imdilated intermediate legs of 

 the female. It is also a larger and more robust insect than any species 

 of Polycentropus, but the ueuration is almost identical with that of some 

 species of that genus. In the posterior wings the anterior branch of 

 the ramiLS discoidalis forms a forked cell at the apex, and the discoidal 

 cell is closed. 



The synonymy of the single species is as follows : — 



Plectrocnemia conspersa — Curtis. 



PMlopotamus conspersus. Curt. Phil. Mag. 1834, p. 213, 5; Flectroc- 



nemia conspersa, Hag. Ent. Ann. 1861, p. 2, 87; Sydropsyche 



senex, Pict. Eecherch, p. 219, 28, pi. 19, fig. 1 (1834) ; Flec- 



irocnemia senex, Steph. 111., p. 168, 1 ; Brauer Neurop. Aust., 



p. 39. 



A widely distributed insect, probably not very common anywhere. 



N.B. — Plectrocnemia atomaria (Schranck), Kol. gen. et spec. 



Trichop. pt. 2, p. 212, 1, has certainly no right to the synonyms there 



given, at any rate as far as regards the names of Curtis, Pictet, Stephens, 



and Brauer. Kolenati's species is a Polycentroptisiyide P. muUigut talus') . 



