1887. | BOTANICAL GAZETTE. 209 
ASCLEPIAS INCARNATA.—The small anther wings are 
adapted to fasten the corpuscula upon the legs of large 
insects from the claws to the middle of the tibia, and on the 
claws and tarsal hairs of the small ones; but they catch the 
hairs much more frequently. Of 153 specimens bearing cor- 
puscula, 103 have them on the hairs alone, 42 have them on 
the hairs and claws, and 8 on the claws alone; or, 145 have 
pollinia on the hairs, and 50 have them on the claws. That 
is, about one-third of the specimens bearing pollinia have 
the corpuscula attached to their claws. ‘These processes are 
not so easily caught, because they are so large. Corpuscula 
much more readily than in A. verticillata. Sometimes a 
dead insect is found on the flowers. This occurs only when 
render the insect absolutely helpless. I have found Pelo- 
peus cementarius and a Colletes killed in this way. As the 
flowers become larger, in the next two species, insects are . 
killed more frequently. 
__ The hoods are comparatively broad and shallow, and 
their tips do not project beyond the anthers. The visitors 
are more miscellaneous than those of the other species we 
have to consider. 
The most abundant insects observed by me on the flowers 
were bumble-bees, especially Bombus separatus, wasps 
(Sphex and Tachytes) and butterflies ( Papilio and Danais). 
Notes were made in a patch covering two or three acres, on 
twenty-one days, between July 22 and August 21. 
ES een ee Shean 
gee eye Soe Tae | 
£2 | 82 || 8 | 22) 2 
ho | B bis = iC) = 
= FJ S717 Bhs a 
With pollinia i ae ee era SOG Ga 
Without pollinia ......0.. se: 5 | 5 1 bi rs 
Dieses, Coe Pt peta eee pe 
| ag to 20d tees eae foe 
Ap ee ee | Das illeaenemiennaion 
