APRIL, 190G. SOME NOTES ON THE POLLINATION OF FLOWERS. 
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developed yellow petals, the distinct odor, and above all the 
nectar-secreting staminodia (not mentioned by Meehan as cited 
by Loew point to an adaptation to insects. The list of visitors 
offered below gives evidence of a rather numerous and varied 
gathering of insects at the flowers, and shows the prominent part 
taken by flies, since 75% of the 44 visiting species belong to this 
order. 
A. HYMENOPTERA. 
Vespidse: (1) Vespa germanica Fabr. s. ; Braconidae: (2) 
Microgaster sp. ; Chalcididae : (3) Elachistus cacabciw How., s. ; 
(4) Butelus (Pteromalus) onerati Fitch., s. 
B. diptera. 
Bibionidae: (5) Bibio gracilis Walk.; Phoridae: (6) 
Hypocera femorata Meig. ; Platypezidae : (7) Platypeza twniata 
Snow 7 ; Syrphidae: (8) Chrysogaster nitida Wied. ; (9) Syrphus 
americamis Wied.; (10) 5*. ribesii L. ; (n) Allograpta obliqua 
Say.; (12) Meso gramma geminata Say; (13) Sphcerophoria 
cyUndrica Say ; (14) Eristalis tenax L. ; (15) E. transfer sus 
Wied.; (16) Syritta pipiens L. ; Tachinidae: (17) Phorantha 
occidentis Walk.; (18) Oestrophasia ochracea Bigot; (19) 
Frontina sp. ; Sarcophagidae : (20) Sarcophaga helicis Town.; 
(21-22) Sarcophaga spp.; Muscidae: (23) Pollenia rudis Fabr. ; 
(24) Chrysomyia maccllaria Fabr. ; (25) Lucilia cwsar L. ; (26) 
Morellia micans Macq. ; (27) Pseiidopyrellia cornicina Fabr. ; 
(28) Miisca domestica L. ; (29) Stomoxys calcitrans L. ; An- 
thomyidae: (30) Phorbia fusciceps Zett. ; (31-32) Phorbia spp. ; 
(33) Ccenosia fuse 0 punctata Macq. ; Scatophagidae : (34) Scato- 
phaga squalida Meig.; Sepsidae : (35) Sepsis violacea Meig. ; 
Oscinidae : (36) Chlorops assimilis Macq.; Sapromyzidae : (37) 
Lonchcea polita Say — all s. or f. p. 
C. EEPIDOPTERA. 
Heterocera: (38) Laphygma obscura Riley ; (39) Heliophiia 
iinipuncta Harv. ; (40) Cucullia astcroides, Gn. ; (41) Auto- 
grapha brassicw Riley ; (42) Heliothis obsoleta Fabr. — all s. 
D. COEEOPTERA. 
Carabidae: (43) Lcbia scapularis Dej.; Chrysomelidae : (44) 
Diabrotica vittata, Fabr. — all s. 
The pollen is deposited mostly on the mouth-parts of the 
visitors. At the beginning of the blooming period before the 
