148 THE ENTOMOLOGIST. 
phloxes, pink stock, yellow pyrethrum, dxhlia, and a quantity 
of Campanula (? media—the large Canterbury bell). Late in the 
evening I watched a humble-bee at work on the Campanula, and 
kept account of the number of flowers it visited on each different 
plant. The results were as follows:—6, 5, 1, 8, 1, 2 (on the 
plant visited first), 2, 1, 1, 1,.0—8)-41, 1,8, 2, 2, 2, 2, 8, 8, 3, te, 
58 flowers in all on 21 plants. 
15.—Same date and place. A similar bee visited the 
Campanula as follows :—7, 4, 2 and 2, i.¢., 15 flowers on 4 plants. 
16.—Same date and place. A similar bee visited the Cam- 
panula 5 and 10 times, 2.e., 15 flowers on 2 plants. 
17.—Same date and place. A _ similar bee visited the 
Campanula 2, 10, 4, 8, 6 and 11 times, #.¢., 41 flowers on 6 plants. 
These four observations show absolute constancy, inasmuch as 
4 humble-bees paid 129 visits to flowers on 84 plants of Cam- 
panula, without once visiting another species, though in the last 
case the bee settled momentarily on a flower of pink stock. 
Many flowers of Campanula were, however, obviously rejected— 
the bee going to the entrance but no further, perhaps because the 
flower was withering or had just been visited, so that the bee was 
in some way enabled to perceive the absence of nectar. 
18.—Oct. 2, 1881. Meadow in Navestock Park. No flowers 
present, but a quantity of Scabiosa succisa and an occasional 
Ranunculus (? acris). A humble-bee was observed to make 13 
visits to the former. 
19.—Same date and place. Another humble-bee paid 382 
consecutive visits to Scabiosa succisa, and was lost. 
20.—Same size and place. Another humble-bee visited 
Scabiosa succisa 57 times, although in this case there were 
several other species near. Several times I caused a head 
of flowers to be twice visited thoroughly, by picking it and 
presenting it to the bee. 
21.—March 8, 1882. Garden at Chignal. <A hive-bee which 
I watched, clearly rejected several flowers of Galanthus nivalis 
and red Primula vulgaris, but paid 14 visits to flowers (some 
of them visited twice) on 4 different plants of yellow P. vulgaris, 
and was then lost. Other early spring flowers grew around. 
22.—March 12, 1882. Near Audley End, Essex. Observed 
a hive-bee to visit 14 flowers of Ranunculus ficaria and then fly 
away. No other species on the same spot. 
