1901.] 147 



process, which, however, is, I think, only a secretion (it is curious that it slioulcl 

 assume the same position and form in more than one example). There is also 

 sometimes visible a much exserted slender rod or sheath. 



In the ? , tlie egg-valve is excised on its 

 exposed margin, leaving two prominent lobes 

 on either side ; the side margins are oblique, 

 and also slightly excised, giving rise to minor 

 lobes. These remarks are based on dried ex- 

 amples, prepared by boiling in caustic potash, 

 and subsequently mounted in balsam. 



In the Dovrefjeld ? (in formalin) the 

 form of the egg-valve is practically the same, a slighty sharper outline being natural 

 in a specimen that has never been dry at all. It should be kept in view that the 

 excision of the egg-plate in this species is a real one, and not the result of a mere 

 curving of the plate, which frequently arises in drying (see figures). 



Should this species really pi'ove different from compacta, the name dovreiisis 

 might be retained for it. I have little doubt the insect recorded at p. 30, Ent. Mo. 

 Mag., 2nd ser., vol. x, is the same, although it has full wings. 



ISOGENUS. 



2. nuhecitla, Newman. — One ? from the Grlommen at Saeterstoen appears to 

 belong to the lai'ge form, which in 1-ho nioantimc must be regarded as Newman's 

 species — quite different from the insect found so commonly about Scottish sub-alpine 

 lakes (the name I. rectus has been proposed by Kempny for the latter insect). It is 

 unfortunate that there should remain any doubt as to the true nuhecula of Newman, 

 which, he said, was abundant about running waters in Herefordshire, Worces- 

 tershire, Northamptonshire, &c. My efforts to obtain Isogenus from any of these 

 districts have been unsuccessful, although I owe Dr. John H. Wood, of Tarrington, 

 Ledbury, much for all the trouble he took to find the species without being able to 

 do so. 



3. Nanseni, Kempny. — Several females taken at the River Laagen, near Domaas. 

 This species, which was not separated by me from the other forms when I ex- 

 amined a large collection sent from Finland by Sahlberg, is, I find, represented by 

 examples from Utsjoki, Finnish Lapland. The £ , as far as known, has effective 

 wings. 



Chloropehla. 



4. grammatica, Scop. — Lillehammcr and Molde. 



5. Strandi, Kempny. — Lillchammer and Lesjeverk. 



fi. griseipennis, Piclet. — -Common on the Grlommen at Sneterstoen. Certainly 

 the same as the species recorded by Kempny. I have not been able to compare my 

 specimens with moist material from the central parts of Europe. 



ISOPTEBTX. 



7. Burmeisteri, Pictet. — Two examples from Domaas. 



Capnia. 



8. nigra, Pictet. — Domaas. 



9. atra, Morton. — Fokstuen and Domaas ; only $ of both species. 



