IOWA ACADEMY OP SCIENCES. 
151 
Cimirhita. The three stamens effectively block the way for the 
larger insects. The flower is adapted to hummingbirds, which 
can easily get the nectar with their long tongues. The color 
and odor would seem to indicate that it is adapted to Sphingidm, 
but as the plants were so far away observations were not made 
at night. In addition to the hummingbird, Boraljics 2 ^ennsylvanica 
was observed collecting pollen. Diabrotica vittata was also 
found covered with pollen. 
PLATE XI. 
Hubbard Squash, Cucurbit a Maxima. Fig. 1. Pistillate 
flowers showing shallow nectary with membrane. Fig. 2. 
Staminate flowers. Fig. 3 and 4. Pollen grains; 3, before the 
addition of water; 4, pollen grains after the addition of water. 
Large nectar on one side, and drops of oil over the surface. On 
addition of water several of the spines come off in the form of 
caps. Camera sketches from Zeiss B. B., obt. and compensat- 
ing ocular, reduced one- half. Pigs. 1 and 2 one-half natural 
size. Drawn by Charlotte M. King, except Figures 3 and 3. 
PLATE XII. 
Cucurhita pepo. Figs. 1 and 2. Perfect Gem Squash. Fig, 
3. Pistillate flower showing stigma, style and saucer like nec- 
tary. Fig. 4. Bush Scalloped Squash, pistillate flower with 
open nectary. Figs. 3 and 5. Long warted staminate flowers. 
Pig. 3 Cut lengthwise to show slits near base of filaments, 
used by insects to get the nectar. One-half natural size. All 
drawn by Charlotte M. King. 
PLATE XIII. 
Pig. 1. Musk Melon, Oucumis melo. Fig. 2. Perfect Gem 
Water Melon. Citullus vulgaris. Pigs 3 and 4. Pollen grains 
of Lagenaris vulagris; fig. 3, previous to the addition of water; 
fig. 4, on the addition of water, nucleus shown at one side. 
Figs. 5 and 6. Pollen grains of Ecliinocystis ecMnata. fig. 5, 
before the addition of water; fig. 6, after the addition of water. 
Drawn to same scales as pollen grains in plate XI. Figs. 1 and 
3 drawn by Charlotte M. King. 
PLATE XIV. 
Figs. 1 and 2. Largenaria vulgaris. Pig. 1. Staminate 
flower showing corolla. Fig. 2. Pistillate flower with petals 
removed. Fig. 3. Staminate flower of Perfect Gem Squash 
11 
