4 1893.) Flowers and Insects. 271 
nectaries in seventy-six flowers. On the otherhand, Bomdus 
americanorum, which is larger, more time-saving and less fa- 
miliar with the flower, more frequently neglects to visit the 
nectary under the column and seldom turns back, so that it 
__ misses the lower nectaries even more frequently. I saw fifty- 
_ six individuals of this species miss eighty-five nectaries in 
fifty-six flowers. Both species also often miss the lower nec- 
taries because, after inserting their proboscides into the upper 
ones and finding them empty, they arrive at the erroneous 
conclusion that the lower ones are in the same condition. 
In their economy, the flowers of this plant and the bee first 
mentioned, Emphor bombiformis, stand in a very close rela- 
tion. With the exception of single individuals taken on 
flowers of Cephalanthus occidentalis and I. Tromaea pandurata, I 
have never take this bee on any other flower. On the Azé- 
“ta [have never failed to find it in favorable weather, and 
os found the males in the closed flowers in bad weather. 
»\” Specimens have been observed by me except during the 
eae Agra of the plant, from July 25th to Sept. 16th. 
she se € : provided with a large loose scopa which seems 
Cae y fitted to retain the large pollen grains, and — 
a oe only flower on which I have seen it collecting pol- 
Hibise cordingly, I think the bee depends exclusively upon 
"s pollen for food for its larvae. I have seen the fe- 
¢ making excavatio wey aenne 
a w yards o 
the plants for her nest within a few y 
*eleart other insect at all frequent on the flower is Bom-" 
as td pameiga F.29%. Ihave never found this bee half 
Emphoy a nt, and commonly absent altogether, while the 
Pollen “a abundant. This bumble-bee never collects the 
n addition to these insects I have seen the flowers 
visited fo 
by ee . Oney only by Melissodes bimaculata Lep. 6 ? and 
faureq individuals of Bombus separatus Cr. 9, Entechnia 
P. and Pg eachile brevis Say 4, Euphoria sepulchralis 
IBIScU To, colubris L. | 
itate stj im, RIONUM L.*++Ady. from Eur.”—The five cap- 
ges 0 stand close together, and pollen only touches 
Mas are thas ¢ to the dehiscent anthers, Most of the stig- 
pollinated j be from pollen and can be effectually cross- 
N case of insect visits. After the flowers close; 
the styles bend ° 
utward and downward forcing the stigmas 
"See 
Sprengel: Das entdeckte Geheimniss. 
' 
