INSECTS IN THEIR RELATION TO FLOWERS. 179 
51.—Same date and place. A similar bee visited 7’. acinos 
6 times, and was lost. 
52.—Same date and place. A similar bee visited ZT’. acinos 
23 times, Lychnis rupestris once (this flower it happened to walk 
over), JZ’. acinos 19 times, and was lost. This bee and the last 
three may have been the same one. 
53.—Same date and place. Near the same spot a small 
humble-bee visited Medicago sativa 20 times, and was then lost, 
having passed over, but rejected, Chrysanthemum leucanthemum, 
Helianthemum vulgare, Campanula (? sp.), Sanguisorba officinalis, 
Trifohum pratense, T. repens, an umbelliferous plant, Anthyllis 
vulneraria, &c. 
54.—July 22, 1882. Same place as obs. No. 49. A small 
striped bee visited Thymus acinos 86 times consecutively, then | 
T’. serpyllum, 8 T’. acinos, 1 Centaurea scabiosa, 87 T’. acinos, and 
was afterwards lost, having avoided all the other flowers. Thus 
one bee paid 133 visits to three species of flower, one of which 
was blue and two purplish red. One species of thyme was visited 
131 times, another once, and a species of Centaurea once. 
55.—July 24, 1882. Same place. A moderate-sized totally 
black humble-bee visited Thymus acinos 34 times, and was then 
lost, it having avoided all the other flowers. 
56.—July 26, 1882. Pine Forest, near St. Moritz. I watched 
a medium-sized humble bee pay 18 visits to Geranium sylvaticum, 
one to Trifolium alpinum, then 12 more to the Geranium, when 
IT lost him. Sosa alpina and a few other flowers grew around. 
57.—July 28, 1882. Same place as obs. No. 49. A good- 
sized black humble-bee visited Thymus acinos 86 times, Medicago 
satwa once, T’. acinos 4, Trifolium repens 1 (then hesitated at, 
but rejected, Medicago satwa), and lastly paid two visits to 
Gentiana, being afterwards lost. This insect paid 94 visits 
to four species of flower, two of which were blue (visits 
numbered 90 and 2 respectively), one white (a single visit), and 
one reddish (also a single visit). 
58.—July 31, 1882. The wide, dry, stony bed of the Surlej 
torrent covered with a profusion of flowers. Watched a smallish 
long-bodied striped humble-bee, which was visiting indifferently 
two somewhat nearly allied flowers, viz. Oxytropis campestris and 
Trifolium repens. It visited them alternately the . following 
number of times, commencing with the former:—7, 5; 4, 2; 
