184 FLOWERS AND INSECTS—XXVI 
pulchella, Platychirus quadratus, Sphaerophoria fq, Syritta, 
Syrphus americanus; Hmpid.: Empis avida, distans, Parempis, 
Rhamphomyia limbata fq, priapulus fq, Tachydromia; Bombyli.: 
Bombylius major; Conop.: Myopa pilosa, vesiculosa, Zodion fulvi- 
frons; Tachin.: Euphorocera claripennis, Gonia capitata, Linnae- 
myia, Peleteria, Phorantha humeralis; Sarcophag.: Cynomyia fq, 
Helicobia helicis, Sarcophaga cimbicis, sinuata; Musc.: Pseudo- 
pyrellia; Anthomy.: Coenosia ‘antica, Phorbia platura fq; Ortal.: 
Chaetopsis; Scatophag.: Scatophaga. 
Lepidoptera (1)—JZycaen.: Kupsyche. 
Coleoptera (2, fq¢)—Chrysomel.: Diabrotica vittata; Coccinell.: 
Megilla in cop. 
Salix nigra—Blooms April 22—May 29; 97 visitors observed, 
April 22—May 29; Mis, Y. 
On staminate flowers: 
Long-tongued Bees (14)—Ap.: Apis se, fq; Bomb.: Bombias 
separatus 9, Bombus americanorum 9; Ceratin.: Ceratina 
Zaodontomerus ¢; Megachil.: Ceratosmia 2, se; Nomad.: Gnathias 
cuneatus ¢ 9, fq, ovatus ¢ 9, fq, Heminomada ¢ 9, fq, Nomada 
eressonii <i 9, denticulata § 9, illinoensis ¢ 9, fq, sayi ¢ 9, 
Phor Q. 
Short-tongued Bees (43)—Halict. (2) :—Agapostemon radi- 
atus sc, Augochlora viridula, Chloralictus pilosus se, fq, pruinosus 
se, sparsus sc, ab, tegularis sc, versatus sc, ab, zephyrus sc, ab, 
Curtisapis forbesii sc, Evylaeus arcuatus se, foxii se, fq, pectoralis 
sc, 4-maculatus, Halictus lerouxii se, Odontalictus se, Oxystoglossa 
confusa se, fq, similis fq, Paralictus cephalicus, Seladonia se; Sphe- 
codini: Machaeris stygia; Collet.: Colletes inaequalis 9; Andren.: 
Andrena carlini 9, dunningii 9, se, erythrogastra ¢ 9, se, ab, illino- 
ensis 6 9, sc, fq, macoupinensis 9, sc, type, mandibularis Q, sce, 
nigrae 9, se, type, salicis 9, se, salictaria ¢ 9, se, fq, sayi ¢ 2, se, fq, 
Opandrena cressonii ¢ 9, se, ab, dubia <, miserabilis ¢ 9, se, ab, 
personata (¢, Parandrena ¢ 9, se, ab, Trachandrena claytoniae 9, 
se, crataegi ¢' 9, se, ab, forbesii ¢, heraclei 9, sc, hippotes 9, se, 
nuda Q, se, rugosa Q, se. 
Other Hymenoptera (3)—KHumen.: Ancistrocerus  tigris; 
Chrysid.: Holochrysis hilaris; Bracon.: Microdus fq. 
Diptera (32)—Bibion.: Bibio albipennis, pallipes; Syrph.: Allo- 
grapta, Chilosia capillata, punctulata, Chrysogaster nigripes, Eris- 
talis aeneus, dimidiatus, Helophilus similis, Mesogramma marginata, 
Psilota, Sphaerophoria, Syritta, Syrphus americanus, ribesii; 
Empid.: Rhamphomyia limbata, priapulus fq, sordida; Bombyli.: 
