40 FLOWERS AND INSECTS—XXVI1 
Sambucus canadensis (5: 274-5).—Blooms May 27—August 9; 
32 visitors observed, June 7—-July 11; Pol (Mis), W. All visits are 
for pollen. 
Long-tongued Bees (2, ¢).—Ap.: Apis fq; Ceratin.: Ceratina 9. 
Short-tongued Bees (6, ?, ¢)—Halict.: Chloralictus sparsus ab, 
versatus ab, zephyrus ab, Evylaeus arcuatus, Halictus parallelus; 
Andren.: Trachandrena claytoniae. 
Diptera (19, f)—Syrph.: Allograpta fq, Baccha fuscipennis, 
Eristalis dimidiatus, tenax, Mallota cimbiciformis fq, Mesogramma 
geminata, marginata, Orthoneura nitida ab, Spilomyia hamifera 
fq, Syritta, Syrphus americanus, ribesii fq, Xylota fraudulosa; 
Bombyli.: Anthrax sinuosa, Argyramoeba oedipus; Musc.: Musca, 
Pseudopyrellia; Anthomy.: Phorbia acra, platura. 
Coleoptera (5, £)—Cerambyc.: Euderces; Dermest.: Attagenus 
fq; Malach.: Anthocomus; Mordell.: Pentaria; Scarabae.: Euphoria 
fulgida. 
108 individuals taken on the flowers, July 8-10, 1920, showed: 
Long-tongued Bees (4, ¢)—Apidae. 
Short-tongued Bees (68, 2, ¢)—Halictidae. 
Diptera (32, £)—Syrphidae 31, Anthomyidae 1. 
Coleoptera (4, f). 
Symphoricarpus orbiculatus (16:173-4)—Blooms July 6- 
September 10; 120 visitors observed, July 8-August 30; Mis, Y. 
Long-tongued Bees (10)—Ap.: Apis ab; Bomb.: Bombias sepa- 
ratus 2 %, Bombus americanorum Q, sc, consimilis $, se, impatiens 
2 s, 9 se, fq; Megachil.: Megachilini: Megachile mendica ¢ Q, 
Oligotropus <; Coelioxyini: Coelioxys 8-dentata J, sayi ¢ 9; 
Eucer.: Melissodes bimaculata J. 
Short-tongued Bees (27)—Halict.: Agapostemon radiatus ¢ 9, 
ab, Augochlora fervida 9, viridula ¢ 9, ab, Chloralictus coreopsis 9, 
cressonii ¢ 9, fq, obscurus ¢ 9, ab, sparsus J 9, se, ab, tegularis 
& , fq, versatus 9, sc, ab, zephyrus J 9, ab, Curtisapis coriacea 
3& &, forbesii J 9, Evylaeus foxii 2, pectoralis ¢' ?, fq, 4-macu- 
latus ¢ 9, Halictus lerouxii J 9, ab, parallelus ¢ 9, Odontalictus Q, 
Oxystoglossa confusa ¢ 9, ab, pura ¢ Q, ab, similis ¢ 2, ab, Sela- 
donia ¢ 2; Sphecodini: Sphecodes arvensis ¢ 2, ab, heraclei ¢ 9; 
Prosopid. (8 @): Prosopis sayi, ab, ziziae fq; Collet.: Colletes 
nudus ¢ . 
Other Hymenoptera (48)—Sphec.: Ammobia ichneumonea, 
nuda, pennsylvanica, Isodontia apicalis, macrocephala, Sphex gra- 
cilis, nigricans fq, vulgaris fq; Bembic.: Bicyrtes 4-fasciata, Mega- 
stizus; Scolt.: Elis obscura, 5-cincta fq, Scolia bicineta; Philanth.: 
