If the same principles that have influenced those naturalists 
who have studied the Carabidae, were to be extended to the 
Dyticidse, the genus Coiymbetes might easily be divided into 
several genera ; but as we hope to place genera upon a more 
solid basis, we state most unequivocally, that we shall not 
wittingly adopt any that are not founded on essential characters. 
All such therefore as have no better claim to distinction than 
mere outline, or such-like secondary characters, will be rejected, 
excepting in the order of Lepidoptera. 
The insects of this genus inhabit Lakes, Ponds, Brooks and 
Rivers, and are found the whole year, but most abundantly 
from the end of April to July. The following arrangement 
of our British species will, we think, be found agreeable to their 
affinities ; as we do not possess those with a *, their situations 
may possibly require alteration. 
1. C. striatus Linn. — fuscus Fab. 
2. fuscus Linn. ? — striatus Fab. 
— Panz. 86. 5. 
3. Consobrinus Nob. 
4. Grapii Gyl. — A hr. 6. 4. — niger 
JDej. This insect was un- 
known in Britain till I took 
it at Drayton and Horning 
in Norfolk, in the month of 
May. 
5. fontinalis Leacli MSS. 
6. oblongus III. Gyl. 
7. guttatus Paylc. — picinus Mar. 
fenestratus Panz. 90. 1. 
'*8. angustior Gyl. 
9. conspersus Marsh. Gyl. 
10. bipunctatus Fab. Don. 9.303. 
— Panz. 91. 6. 
11. adspersus Fab. — var. collaris 
Marsh. 
12. agilis Fab. — Panz. 90. 2. mas. 
13. collaris Paylc. — adspersus III. 
Panz. 38. 18. 
14. notatus Fab. Oliv. S. tab. 5. 47. 
— frontalis Mar. — virgula - 
tus III. 
15. pulverosus Enoch. — consper- 
sus Gyl. 
*16. congener Paylc. Gyl. 
*17. C. affinis Paylc. Gyl. 
18. paludosus_Fa6. — politusMars/t. 
19. Sturmii Gyl. 
20. bipustulatus Linn. — Oliv. 3. 
t. 3. 26. — acuductus Mar . — 
carbonarius Fab. 
*21. nigro-aeneus Marsh. 
22. chalconotus III. Panz. 38. 17. 
— nitidus Fab. — concinnus 
Mar. 
23. montanus Leach. 
*24. uliginosus Linn. Gyl. Mar. ? 
25. fem oralis Paylc. Gyl. 
26. fuliginosus Fab. — lacustris 
Fab. Panz . 38. 14. — Hyb- 
neri Mar. 
*27. guttiger Gyl. 
28. fenestratus Fab. — aeneus Panz. 
38. 16. 
29. obscurus Marsh. 
30. ater Panz. 38. 1 5. — fenestratus 
Paylc. 
31. vitreus Paylc. — didymus Oliv. 8. 
t. 4. 37. 
32. abbreviates ,Fa5.— -Panz. 14. 1. 
33. maculates _Lmw. Don. 14. 501. 
— var. inaequalis Mar. Panz. 
14. 8. 
Gyllenhal having described a Coiymbetes elongatus , it became 
necessary to drop the MS. name of our insect. A specimen 
was taken many years since near Wanstead House, Essex, 
by the late Mr. Tuther. 
The plant is IJtricularia vulgaris (Great Bladder-snout). 
