212 - BOTANICAL GAZETTE. [ September, 
The large obovate hoods project half their length beyond 
the anthers, which increases their depth, and makes small 
insects less likely to become entangled. The structure of 
the hoods and the great difficulty smaller insects have in 
effecting pollination convince me that bumble-bees have had 
most influence in modifying the flowers, and they are the 
most common visitors except hive-bees 
It is to be remembered that hive-bees do not belong to 
our fauna, so that an adaptation to these flowers was not to be 
expected. By their great abundance, their constant efforts 
to escape, with the fact that their dead bodies occupy the 
flowers and give forth a disagreeable odor, they have pro- 
duced a well marked disturbance of the insect relations of 
this plant. 
a | 8 Kb ibose ibaa 
= a 5) 3 = a 
D a pi 3 & — 
Bits WORE, Lio ct ail 
Se ee 1 6 8 ie 
With pollinia,...........00.00. heed a 
Without pollinia. 0. weer Peer eg tl pe Ee 
Helis aoc ose kat wag 
Be eae Po gcpe ge ta poe 
| coset 
ASCLEPIAS TUBEROSA.—The anther wings are very del- 
icate, as in A. verticillata, and are ted to catch the 
tarsal hairs many specimens bearing pollinia, two small 
the angles of the win : asily 
wings, that only those with long legs & 
piney the pollinia. The bright orange-red Fick of the 
Prabiiin= eyy the structure of the hoods suggest adaptation to 
utterflies, and the small anther wings seem to be especially 
outed to them. The claws of these insects are rather 
os and, when not in use, are held close together and 
rected in line with the leg; so that they do not often enter 
ye eee menoptera. Of fifty-three specimens De 
€pias pollinia, only eight have them on their claws: 
