30 



Cyrnm urhanus, Stephens, belongs to Anticyra (Psi/chonua),si8 does 

 also probably O. unicolor, of whicb there is no type. 



ECKOMTJS — new genus. 



I propose this generic term for the single species that I am at 

 present acquainted with, in which the first apical sector in the anterior 

 wings ends in a forked cell, but with the following characters presented 

 in the posterior wings. These wings are very narrow at the base and 

 scarcely folded ; the costal margin is slightly elevated in the middle; 

 the ramus discoidalis runs close to the costal margin, the upper branch 

 simple, the lower forked, but no closed discoidal cell. The intermediate 

 tibiae and tarsi in the female are only slightly dilated. 



Ecnomus tenellus — Eambur. 



PMlopotamus tenellus, E-amb. Hist. Nat. Nevrop. p. 503, 4 (1842) ; 



Poli/centropus concinnus, Hag. Ent. Ann. 1861, p. 5. 93, not of 



Stephens. 



Of this I possess several specimens, taken in the fens of Norfolk 



by Mr. Winter. Mr. Wormald has found it in Hyde Park in June. 



It is wanting in Curtis' and Stephens' collections. In the male the 



inferior appendices are long, and at the apex are furnished internally 



with numerous little teeth or spines. 



Dr. Hagen has, I believe, seen Eambur's type, and informs me that 

 there is no doubt as to the identity of the insects. 



KETJEECLiPsis — now genus. 



This genus is formed for the reception of the species that is con- 

 sidered as the Fliryganea himaculata, of Linnseus. This existed in 

 Curtis' collection as Polyeentropus memordbilis, but this name was never 

 published. Dr. Hagen likewise places it in the genus Polyeentropus, 

 but it appears more advisable to transfer it to a separate genus in con- 

 sequence of the very considerable differences in the neuration. 



One striking character that I consider of primary importance is 

 the absence of the transverse nervule, placed between the costa and 

 suh-costa, towards the middle of the costal margin. This is present in 

 all the other genera of HydropsycMdce, with tricalcarate anterior tibiaa, 

 and also in Philopoiamus, and an allied genus. In other respects the 

 neuration of the anterior wings is similar to Polyeentropus, as here 

 restricted, the first apical sector ending in a forked cell. The posterior 

 wings are also similar in form to those of Polyeentropus; the first 



