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208 Mr. F. W. Edwards on British Limnobiidae. 
GONOMYIA. 
1. Cu,a far before the fork of M; discal cell open; R,; curved 
upwards at the tip (subgenus Ptilostena) ; ‘ 2. 
Cu,a close to fork of M (either slightly before or panna it); 
discal cell usually closed; R; almost straight (subgenus 
Tonomyia) “ : a ae 
2. Wings elaborately sootved sexguilala Dale. 
Wings not spotted , 3. 
3. Cross-veins clouded; an extra cross-vein in cell R, jucunda Lw. 
Cross-veins clear; no extra cross-vein. . — connexa Lw. 
4. Rs very short, its base well beyond the apex of Sc 
abbreviata Lw. 
Rs long, its base well before the apex of Se. . 5. 
5. Ro +, nearly straight, shorter or at most very slightly lone 
than R, SR 
Ry +3 more or less sented at eae. atianckty phen than R, 7. 
6. Body mostly shining black; discal cell open . lateralis Meq. 
Body brown, scarcely shining; discal cell closed 
alboscutellata v. Res. 
7. Pleurae usually entirely sulphur-yellow; abdomen above with 
broad yellow margins; scutellum and posterior part of 
mesonotum somewhat shining 4 : 8. 
Pleurae with darker markings; abdomen above with narrow 
yellow margins; thorax entirely dull o: 
8. Discal cell at least twice as long as its greatest breadth 
recla Tonn. 
Discal cell less than twice as long as its greatest breadth 
lucidula Meij. 
tenella Mg. 
10. 
dentata Meij. 
simplex Tonn. 
9. Pleural markings very indistinct 
Pleural markings distinct, black 
10. Proboscis orange-yellow 
Proboscis dark above 
G. sexguttata Dale. Mr. C. G. Lamb has taken this 
species in numbers at St. Merryn, Cornwall, which is the 
only recent record I know of. 
G. jucunda Lw. I have seen no example of this species, 
which is regarded as British solely on the strength of 
Mr. R. C. Bradley's somewhat doubtful record (Ent. Mo. 
Mag. xxix, p. 285). 
G. connexa Lw. Lt.-Col. Yerbury took two females of 
this species at Porthcawl, Glamorgan, 20 v, 1903 and 
3 vill. 1906. These are now in the British Museum. 
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