Insects in Great Britain . 
55i 
32, 33, 34, 40 ; De Vries 2460 ; Arct. 36 ; Alps 2, 34 ; Pyren. 
17; N.Am . 19 a.] Contrasting it with T. repens the effect 
of the greater length of the tube in inviting long-tongued 
Hymenoptera and Lepidoptera is evident. According to 
Verhoeff insects on the Friesian coast require tongues il- 
ls mm. long, and to Muller 9 mm. long; at Clova 8 mm. 
would suffice. Apis and some of the shorter-tongued Bombi 
and other Hymenoptera are recorded as obtaining honey by 
perforation of the calyx. A honey-bird visits it in the United 
States. Our observations need extending. 
Visitors. Hymenoptera. Aculeata : Apidae : (1) Bombus terrestris 
L., sh. 22. IX. 95, 800 ft. (2) B. venustus Smith, sh. n. VII. 96, 700 
ft. Diptera. Bibionidae\ (3) Bibio pomonae F., seeking h. 11. VII. 
96, 700 ft. Muscidae : (4) Lucilia cornicina F., fp. 5. VII. 95, 700 ft. 
Anthomyiidae'. (5) Anthomyia sulciventris Ztt., fp. 2. VII. 95, 900 ft. 
(6) A. sp., fp. 22. IX. 95, 800 ft. Coleoptera. (7) Meligethes viri- 
descens F., cp. and fp. 23. VI. 95, 800 ft. Each once. 
123. Trifolium hybridum, Linn. [Lit. N.C.E. 3 b, 9, 33, 
34 ; Kirchner 1183.] Cultivated, and well visited by Apis. 
Visitors. Hymenoptera. Aculeata: Apidae : (1) Apis mellifica 
L., sh. 5. VII. and 22. IX. 95, 25. VI. 96, 7-800 ft. Diptera. Mus- 
cidae'. (2) Lucilia cornicina F., fp. 5. VII. 95, 700 ft. 
124. Trifolium repens, Linn. [Lit. Brit. 23 ; Darwin 468 
and 482 ; Marquand 1513 ; N.C.E. 1, 3b, 4, 11, 14, 14a, 15, 
16, 18, 25, 30, 31, 32, 33, 34, 40 ; De Vries 2460 ; Arct . 34, 
36 ; Alps 2, 34 ; Pyren. 17.] A Bombus-flower which by the 
accessibility of the honey attracts Apis in great numbers. In 
Arctic Norway Bombi are its only recorded visitors ; they 
are the most abundant visitors in the Alps and in the 
Pyrenees. In North Central Europe and in Britain where 
bees are kept Apis is perhaps more frequent than the Bombi. 
Darwin demonstrated in England the need of insect aid in 
pollination. 
Visitors. Lepidoptera. Rhopalocera: (1) Coenonympha pamphilus 
L., sh. 22. VI. 95, 800 ft. • (2) Lycaena icarus Rott., sh. 26. VL-i. 
VII. 95, 10. VII. 96, 800 ft. Heterocera: Geometridae : (3) Cam- 
