828 Ml'. K. J. Morton's Further Notes on Hyclroptilidx. 



0. sinvplex, Ris (Mitt. Schweiz. entom. Gesell., Bd. ix, 

 p. 420). 

 Described from Switzerland, occurs in different parts 

 of Scotland about springs, sometimes where there is no 

 surface Avater in summer, the moisture being all absorbed 

 by sphagnum or moss. 



0. distindella, McL. 



Taken in Norway (Morton). Thanks to Silfvenius, I 

 have seen abundant material of this species from Finland, 

 and I am enabled to give a better figure of the dorsal 

 processes (called by me superior appendages). 



0. sagittifcra, Ris. 



Was described (op. cit., p. 421) from a unique specimen 

 taken at the Hausersee, near Ossingen. A single $ from 

 Finland was subsequently seen by me and referred with 

 a little hesitation to this species, but all doubt was removed 

 by the capture of 8 ^ and a few ^ at Rannoch, Perthshire, 

 in the past summer. Silfvenius has also been successful 

 in again finding the species, and I have now, through him, 

 examined a great number of specimens. For the sake of 

 comparison, I give a figure of the dorsal process. I may 

 add that in a preparation made from a Finnish example 

 there are four teeth on this process instead of three, the 

 additional tooth being large and conspicuous. 



O.fclina, Ris (op. cit., pp. 422-3). 



Described from a single $ reared from material from the 

 Katzensee. This is the only European species of the genus 

 which I have not personally examined. 



Explanation of Plate XXI. 



1. Apex of abdomen of Hydroptila cintrana from above. 



2. „ „ J, „ beneath. 



3. „ ,, ,, ,, side. 



4. „ ,, Stactobia atra from beneath. 



5. „ „ Oxyethira mirabilis from beneath. 



6. Last dorsal segment of Oxyethira mirabilis. 



7. Dorsal process of Oxyethira distinctella. 



8. „ ,, „ sagittifera. 



JvNE 15th, 1904. 



