208 BOTANICAL GAZETTE. [ September, 
fact, does not need to, as itis better adapted to fix its cor- 
puscula directly upon the insect. On account of the short- 
ness of the hoods, the position of the corpuscula on the legs: 
of insécts depends on how much the length of the legs ex- 
ceeds that of the slits. ‘The feet of the smallest visitors reach 
below the angles of the wings, and corpuscula are found on 
their tarsi. Large insects, bumble-bees, have pollinia om 
hairs from the claws to the middle of the tibie. I have found 
more species of Hymenoptera. As the hoods increase 1p 
depth from this through A. incarnata, Cornuti, and Sulh- 
vanti, long tongued bees increase in number of individuals, 
while the number of species of Hymenoptera decreases. The 
number of species of butterflies in the table is quite mislead- 
ing. The most common were small ones, which seldom 
remove pollinia of any Asclepias, the large species bene 
represented by only one or two individuals of each. 
In color, accessibility of nectar, and, consequently, 1» 
the general character of its insect visitors, A. verticillata 
shows more resemblance to certain Umbellifera than to the 
other species referred to in this paper. 
Observations were made in a patch about fifteen feet long 
o an 
and four feet wide : rag d 
August a1, HM AEP days, between July 
NOS ie eae oh ee 
aa iene oy 
eet 2 ot eg 
eee ee 
& md ae 
ee ee ea 
RRR aren eee | |e 
With pollinia.......0..0 00... | Siief4 ie! 
Without pollinia........... | 9 11 1 he 
er | | |r 
Bei el 
