Insects in Great Britain. 
321 
B' § 3. Blue-flowered Compositae. 
59. Centaurea Cyanus, Linn. [Lit. N.C.E. 1, 3 c, 9, 11, 
14, 16, 18, 32, 34, 40.] 
Visitors. Hymenoptera. Aculeata: Apidae : (1) Andrena analis 
Panz., seeking h. Diptera. Anthomyiidae : (2) 1 sp. Both 11. VII. 
96, 600 ft. 
59 a. Lactuca alpina, Benth. [Lit. N.C.E. Loew 1358; 
Alps 2; Arct. 36.] At 2 ; oooft. The capitula contain 12-20 
flowers, and number 16-20. The neighbouring flowers may 
pollinate each other, but self-pollination by the rolling back 
of the stigmatic lobes seems not to occur. In this our 
observations agree with those of Muller. We have had no 
favourable opportunities for observing visitors. 
B' § 4. Purple-flowered Compositae. 
60. Centaurea nigra, Linn. [Lit. Brit. 23, 39 ; Marquand 
1513; N.C.E. 8; Pyren. 17.] 
Visitors. Hymenoptera. Aculeata: Apidae : (1) Bombus terres- 
tris L., sh. 15-21. IX. 95, 8-900 ft. (2) B. agrorum F., sh. 15-21. 
IX. 95, 8-900 ft. (3) B. lapidarius L., sh. 16-22. IX. 95, 800 ft. 
(4) B. lapponicus F., 16. IX. 95, 800 ft. Diptera. Empidae'. (5) 
Empis grisea Fin., sh. 15-21. IX. 95, 800 ft. (6) Pachymeria pal- 
paris Egg., sh. 16. IX. 95, 800 ft. Anthomyiidae'. (7) Hyetodesia 
incana W., 16. IX. 95, 800 ft. (8) Drymia hamata Fin., sh. and fp. 
15-16. IX. 95, 8-900 ft. (9) Anthomyia sp., sh. 21. IX. 95, 800 ft. 
Coleoptera : (10) Meligethes viridescens F., 15-16. IX. 95, 8-900 ft. 
61. Carduus palustris, Willd. [Lit. Brit. 23 ; N.C.E. 1, 
3 c, 8, 16, 18, 34, 40 ; De Vries 2460 ; Warnstorf 2507 ; Alps 
2, 34.] Bombus terrestris and Empis tessellata show some 
measure of constancy in autumn. 
Visitors. Lepidoptera. Rhopalocera: (1) Argynnis aglaia L., 
sh. 29. VI.-i. VII. 95; 22. VI.-10. VII. 96, 8-900 ft. (2) Lycaena 
icarus Rott., sh. 28. VI. 95, 800 ft. Heterocera : Noduidae\ (3) 
Hydroecia nictitans Bkh., sh. 13-21. IX. 95, 7-1,000 ft. Hymeno- 
