230 Mr. F. W. Edwards on British Limnobiidae. 
The structure of the hypopygium will distinguish it from 
the somewhat reddish variety of 7. fuscata which is not 
uncommon. 
T. parva Mcq. What I take to be this species has occurred 
at Letchworth, Herts., and Shefford, Beds., and is probably 
common elsewhere. It may be only a variety of 7. hiemalis, 
but seems distinct by the characters given in the key. 
Fic. 
EXPLANATION OF PLATES I. Aanp II. 
1. Dicranomyia halterella sp.n. Hypopygium : a, from below ; 
b, from above. 
2. Ke ventralis Schum. Claspers, from above. 
3. Helius dubius sp. n. “1 Fi 
4. » flavus (Walk.) ws ne 
ay » pallirostris sp. n. oy “ 
6. Gonomyia recta Tonn. Hypopygium from above. 
Tf < simplex Tonn. 18 A 
8. Erioplera meijeret sp. n. Claspers. 
9. 7s verralli sp. n. a 
10. 3 nielseni Meij. R 
11. Molophilus bifidus Goet. a, hypopygium from - side 
(aedoeagus removed); 6b, aedoeagus. 
12. e jlavus Goet. Hypopygium: a, from side, 
b, from beneath. 
13. 5 curvatus Tonn. Hypopygium, half from 
beneath. 
14. Ormosia aciculata sp.n. Hypopygium, half from beneath. 
15. »  albitibia sp. n. Claspers. 
16. Crypleria carteri Tonn. (? = Neolimnophila ultima O.-8.) 
Hypopygium from above. 
17. Idioptera dalei sp. n. a, claspers; b, aedoeagus. 
18. x apicata (Lw.). es 39 > 
Lt) een mundata (Lw.). Claspers. 
20. Hs marmorata (Mg.). 5; 
21. Tricyphona schummeli sp.n. Hypopygium from above. 
22. Ma unicolor Schum. - = > 
23. a claripennis (Verr.). 3 “6 x 
24. bd lucidipennis sp. n. 5 99 » 
25. T'richocera major sp. n. " 99 ” 
