1894.] Flowers and Lusects. 109 
COLEOPTERA.—Coccinellidae: (4) Megilla maculata DeG., 
f. p.; (5) Coccinella g-notata Hbst., s. 
The three species of Ranunculus, an account of which has 
been given above, are in Competition with one another and 
with other members of the genus, as well as with other mem- 
bers of the order, such as Isopyrum, Anemonella, Myosurus, 
Hydrastis, etc. In the period from the ldfter part of April to 
the middle of May, which is the maximum period of Ranun- 
culacee, Delphinium tricorne and Aquilegia Canadensis are 
also in bloom, but they can hardly be regarded as competit- 
ors, since the former is adapted to bumble-bees and the lat- 
ter to humming-birds. ° 
HYPERICUM CISTIFOLIUM Lam.—The stems grow from 
3-6" high and are often collected in rather conspicuous 
patches. The flowers appear in many-flowered cymes, are 
yellow, and expand about 15"". Of the numerous stamens 
the inner dehisce first, rising to the centre. The flowers are 
homogamous, with a chance of self-pollination. The homo- 
samy, however, does not exist as a provision for self-pollina- 
tion, though under certain conditions, it may be of advantage 
o this purpose; but is correlated with the fact that the 
pent are devoid of nectar, and are visited exclusively for 
en. 
Sty isa common. characteristic of pollen-flowers, 
ets pee many highly organized flowers which secrete 
gam Bes a abundant pollen. The fact is that dicho- 
ous oo sadvantageously in all cases in which a numer- 
tors 4 visitors come exclusively for pollen, for these vis- 
negiect the flowers which are in the pistillate stage. 
TRI a a cistifolium depends almast exclusively on bum- 
«females and workers, which visit it to collect pollen. 
Species were: ent days [| noted them thus engaged. The 
Pennsyloanse, ") Bombus americanorum F.9%, ab.; (2) B. 
occasion | ek eG. 8; (3) B. separatus Cr. 9%, ab. On one 
ob. 9 Sg the pollen collected by Agapostemon bicolor 
€ flowers bloom from June 18 to July 22. 
XYLUM AMERICANUM Mill.—The northern prickly 
uration, Apr ae ly spring, and its blooming time is of short 
tise from 13m 2th to 28th. The shrubs grow insmall clumps and 
Clusters and The greenish flowers are in small umbel-like 
a are NO more conspicuous than the young leaves 
Todd; Am. N 
XANTHO 
ash blosso 
at. 14: 668, and Trelease: ibid., 731. f 
