Insects in Great Britain * 
243 
mouthed corolla, so that the stamens and stigma are freely 
exposed. To anyone accustomed to the Scottish moors, the 
dust that rises from the heather when one walks through it 
on a hot day, more especially if it has been calm beforehand, 
is a familiar phenomenon. On examination, this dust is found 
to be the pollen of the Calluna ; it often rises in dense clouds 
after a few days of warm still weather, when one shakes the 
plants by walking through them. If after such weather 
a breeze spring up, the pollen blows about from flower to 
flower on a large scale, and the freely exposed and rather 
large stigmas will be, almost certainly, pollinated. This 
anemophily of the heather combined with its social growth, 
must be of considerable importance to it, and probably as 
much cross fertilization takes place in this way as by insect 
aid. 
Visitors . Lepidoptera. Rhopalocera : (1) Polyommatus phloeas 
L., s. h. Rase. 7 and 14. 9. 94 [also at Scarborough]. Heterocera : 
Tortricidae\ (2) Peronea aspersana Hub., s. h. Rase. 31. 8. 94. 
Hymenoptera. Aculeata : Acutilingues : (3) Bombus muscorum L., 
s. h. ab. F. H. 6 and 7. 9. 94. (4) B. pratorum L., s. h. Rase. 31. 8. 
94. (5) B. scrimshiranus Kirb., s. h. F. H. 7. 9. 94. (6) B. terrestris 
L., s. h. ab. 30. 8 to 7. 9. 94. (7) Apis mellifica L., s. h. very ab., 
F. H., Rase., and on summit of Screel (1,120 ft.), 30. 8 to 7. 9. 94. 
Diptera. Syrphidae : (8) Sericomyia borealis Fin., f. p., freq. F. H. 
6 and 7. 9. 94. (9) Platychirus albimanus F., s. h. and f. p. freq. 
Rase. 31. 8 and F. H. 6. 9. 94. (10) P. manicatus Mg., s. h. freq. 
F. H. 6. 9. 94. Anthomyiidae : (n) Limnophora sp. ?, f. p. Rase. Rd. 
31. 8. 94. (12) Anthomyia radicum L., s. h., do. (13) A. sp. ?, f. p. 
do. Cordyluridae : (14) Scatophaga stercoraria L., f. p. freq. F. H. 
6. 9. 94. Sepsidae : (15) Themira minor Hal., s. h. ab., do. 
19. Erica cinerea L. [Class H, Lit. 1, 4, 18, 21, 633 a, 
467 b, 478 b. See also Art. 49, below.] Abundant on the 
moors, though not equal to Galkina. The base of the corolla 
was often found to be perforated (presumably by Bombi). 
On the summit of Screel (i,j#o ft.) nearly all the flowers were 
in this condition, but were being visited by great numbers of 
Apis, sucking honey in the proper manner. 
