Insects in Great Britain. 
625 
Myrmicidae : (9) Myrmica rubra L., sh. 16-23. VI. 95; 19. VI. 99, 8-900 ft. 
Petiolata parasitica: Ichneumonidae : (10) 1 sp., sh. 22. V.-3. VI. 95; 23. V. 97, 
10-1,300 ft. Chalcididae : (n and 12) 2 spp., 15-29. VI. 95; 29. VI. 96; n. VI. 
99, 8-2,500 ft. Diptera. Syrphidae : (13) Platychirus manicatus Mg., 21. VII. 
95 i 25. VI. 96, 7-1,000 ft. (14) P. clypeatus Mg., 29. VI. 95, 1,000 ft. (15) 
P. albimanus F., 21. IX. 95, 800 ft. (16) Melanostoma mellinum L., 20. VI. 95, 
1,000 ft. (17) Chilosia fraterna Mg., sh. 26. VI. 95 ; 19. VI. 96, 8-1,300 ft. 
(18) Chrysogaster hirtella Lw., sh. 22. VI. 95, 800 tt. (19) Syrphus sp., 20. VI. 95, 
900 ft. (20) Ascia Ppodagrica F., 26. VI.-i. VII. 95, 800 ft. (21) Sphaerophoria 
scripta L., sh. 19. VI. 96, 2,200 ft. (22) S. nitidicollis Ztt., 20. VI. 95, 1,600 ft. 
E 7 npidae\ (23) Empis lucida Ztt., 12-14. VI. 99, 14-1,600 ft. Bibionidae\ (24) 
Scatopse sp., 29. VI. 96, 1,500 ft. Dolichopodidae : (25) Dolichopus atratus Mg., 
22. VI. 96, 800 ft. (26) D. rupestris Hal., sh. 6. VII. 95, 1,500 ft. (27) Hercostomus 
nigripennis Fin., 1. VII. 95, 800 ft. Tachinidae : (28) Siphona geniculata Deg., 18. 
VI. 99, 800 ft. Muscidae : (29) Calliphora erythrocephala Mg., 4. VII. 95 ; 16. VI. 
99, 8-1,500 ft. ATithomyiidae : (30) Hyetodesia incana W., 26-29. VI. 95 ? 1,000 
and 2,400 ft. (31) Spilogaster nigrivenis Ztt., 30. VI. 96, 2,100 ft. (32) Limnophora 
sp., sh. 19. VI. 96, 15-1,600 ft. (33) Drymia hamata F., 20. VI.-6. VII. 95; 20. 
VI.— 1. VII. 96, 8-2,500 ft. (34) Trichophthicus hirsutulus Ztt., 20. VI. 95 ; 6. VII. 
96, 16-2,000 ft. (35) Hylemyia nigrescens Rnd., sh. 10-11. VI. 99, 7-1,300 ft. 
(36) Anthomyia radicum L., 10-18. VI. 99, 7-2,000 ft. (37) A. sulciventris Ztt., 
20. VI. 95 ; 20-27. V. 97, 5-2,500 ft. (38 and 39) Anthomyia 2 spp., sh. and fp. 20. 
VI. 95; 14-21. IX. 95 ; 22. V. 96 ; 19-22. VI. 96, 8-2,500 ft. (40) Coenosia sp., 
fp. 19-20. VI. 95 ; 27. VI. 96 ; 11. VI. 99, 8-2,000 ft. Cordyluridae : (41) Scato- 
phaga sp., sh. 19. VI. 99, 2,200 ft. Ortalidae : (42) Pteropaectria frondescentiae L., 
sh. 1-6. VII. 95, 9-1,700 ft. Ephydridae : (43) 1 sp. 15. VI. 95, 900 ft. Chloro- 
pidae\ (44) Oscinis sp., 20. VI. 95, 8-1,200 ft. Phytomyzidae : (45) Phytomyza sp., 
14. IX. 95, 1,300 ft. Phoridae\ (46) Phora sp., 20. VI. 95; 20. IX. 95, 10-1,300 ft. 
Coleoptera. (47) Meligethes viridescens F., sh. and fp. 24-29. VI. 95 ; 21. IX. 95 ; 
19-25. VI. 96, 7-2,500 ft. (48) M. aeneus F., 1. VII. 95, 1,500 ft. Hemiptera. 
(49) 1 sp., 10. VI. 99, 700 ft. 
213. Potentilla maculata, Pourr. ( P . anrea , Linn ). [Lit. Brit. 23 ; 
Alps 2, 21 a, 21 b ; Pyren. 17 .] The flower is 18-20 mm. across and very- 
conspicuous. The mechanism seems to agree closely with that of P. 
Tormentilla. Honey is present in fair quantity. 
Visitors. Diptera. Syrphidae'. (1) Platychirus sp., 17. VI. 99, 2,300 ft. 
Anthomyiidae : (2) Drymia hamata Fin., seeking h. 20. VI. 96, 2,300 ft. (3) Anthomyia 
sulciventris Ztt., 25. VI. 96, 2,200 ft. Araneida. (4) Xysticus sp., lying in wait, 
17. VI. 99, 2,300 ft. 
214. Potentilla Comarum, Nestl. [Lit. Brit. 23 ; N.C.E. 1 , 8, 12 , 14 , 
14 a, 18 , 33 ; Arct. 34 .] At the opening of the bud the stamens standing 
erect dehisce ; then they move outwards and the anthers fall off. But it 
would seem that the outermost stigmas are receptive before all chance of 
pollination from the innermost stamens has passed away. The central 
U u 
