86 TRANSACTIONS, NATURAL HISTORY SOCIETY OF GLASGOW. 
make out, little or no difference is made between the various species 
of Salix. On Heather (Callwna Hrica, DC.), bees are also fairly 
constant, though, with the Humble-bees at any rate, changes to the 
two common species of heath (Hrica Tetralia, Linn., and L. cinerea, 
Linn.) are very frequent, and between these two I have seen 
Bombus muscorum, Linn., change as often as five times in eight 
visits. I will now give one or two striking instances of the ~ 
‘‘inconstancy” of the bee. There is a bank on the road from 
Busby Station to Carmunnock, where the two species of Avens, 
Geum rivale, Linn., and G. wrbanwm, Linn., and also the hybrid 
G. intermedium, Ehrh., are all growing together. On this bank 
I have watched bees often working at these flowers, and have 
never seen a single instance of strict constancy. Visits to Gewm 
urbanum, Linn., were by no means so frequent as to the other 
two, and some bees confined themselves to Gewm rivale, Linn, 
and the hybrid. The following record of the behaviour of a 
Humble-bee (Lombus sylvarum, Linn., I believe) is perhaps the most 
striking :— 
Geum rivale, Linn., 2 visits 
intermedium, Ehrh., 1 visit. 
rivale, Linn., iMate 
intermedium, Ehrh., 2 visits 
wrbanum, Linn., 5a aaa 
rivale, Linn., 6) 
imtermedium, EKhrh., oe 
wrbanum, Linn., 1 visit 
or 7 changes in 18 visits. 
At Chryston, in June, 1892, I watched a number of bees work- 
ing at Marsh Marigold and the Lesser Celandine. Almost every 
one of them shifted at intervals from one plant to the other. 
A Hive-bee gave— 
Caltha pulustris, Linn., eB 7 visits. 
Ranunculus Ficaria, Linn., 
Caltha pulustris, Linn., 
Ranunculus Ficaria, Linn., ... 
Caltha pulustris, Linn., 
oO bo W& bl 
4 changes in 17 visits. 
