Insects in Great Britain. 
265 
of the many small lakes in the district. It was never found 
more than a few yards back from the edge of the water, and 
consequently it must often become submerged, in which case, 
as is well known, it ceases to bear flowers and propagates 
itself extensively by runners, at the same time producing 
a new type of leaf. The flowers are in groups of three, 
a male in the centre, on the end of a peduncle, and two 
sessile female flowers at the base of it. The stamens are long 
and flexible with large versatile anthers, and the stigmas 
long and brush-like. The flowers are anemophilous, and the 
female flowers come out before the male to which they are 
attached, thus hindering self-fertilization. Nearly all the 
specimens we examined had set a full complement of seed. 
No insect visitors were seen. 
ERICACEAE: 48. Calluna vulgaris Salisb. [See No. 18, 
Auchencairn.] Frequent in the drier parts of the hills, but 
not abundant in the district. 
Visitors. Lepidoptera. Rhopalocera : (1) Coenonympha pamphilus 
L., s. h. 800-1,050 ft. (on Plynlimmon) 28. 8 to 5. 9. (2) Polyommatus 
phloeas L., s. h. 800 ft. 30. 8 to 10. 9. 93. (3) Lycaena icarus Rt., s. h. 
700 ft. 30. 8. 94. (4) Vanessa urticae L., s. h. 800-1,150 ft. 28. 8 
to 10. 9. 93. Heterocera: (5) Moth unnamed, s. h. 1,050 ft. 28. 8. 93. 
Hymenoptera. Aculeata : Acutilingues : (6) Bombus terrestris L., s. h. 
freq. 300-1,100 ft. 28. 8 to 5. 9. 93. (7) B. lapidarius L., s. h. 600- 
1,800 ft. 28. 8. 93. (8) B. lapponicus F., s. h. 1,800 ft. 29. 8. 93. 
(9) B. scrimshiranus Kirby, s. h. 800 ft. 10. 9. 93. (10) B. hortorum 
L., s. h. 600-1,800 ft. 28. 8 to 4. 9. 93. (11) B. muscorum L., s. h. 
300-800 ft. do. Vespidae : (12) Vespa vulgaris L., s. h. 400 ft. 1. 9. 
93. Formicidae\ (13) Formica fusca L., do. Diptera. Syrphidae. 
(14) Melanostoma scalare F., s. h. 300 ft. 30. 8. 93. (15) Platychirus 
manicatus Mg., 700 ft., do. (16) Sericomyia borealis Fin., s. h. 200 ft. 
30. 8 to 1. 9. 93. (17) Eristalis tenax L., s. h. freq. 600 ft. Aug. 
Muscidae\ (18) Lucilia cornicina F., freq. 800-1,800 ft. 28. 8 to 10. 
9. 93. (19) Calliphora erythrocephala Mg. (20) C. cognata Mg. 
(21) C. sepulchralis Mg., 800-1,000 ft. 9. 93. (22) Pollenia rudis F., 
700 ft. 30. 8. 93. 
Of these visitors, Nos. 4, 6, 7, 8, 10, 18, occur at alpine levels 
(No. 8 only observed at 1,800 ft.). 
