180 FLOWERS AND INSECTS—XAVI 
Short-tongued Bees (23)—Halict. (2): Agapostemon radiatus, 
Chloralictus pilosus se, fq, sparsus sec, ab, versatus se, ab, zephyrus 
se, ab, Evylaeus foxii se, ab, pectoralis sc, fq, Halictus lerouxii se, 
ab, Odontalictus, Oxystoglossa pura, Seladonia se, fq; Andren. 
(fg @): Andrena dunningii, erythrogastra se, ab, mandibularis se, 
salicis sc, sayi fq, Opandrena cressonii se, ab, in cop, miserabilis 
se, ab, Parandrena sc, ab, Trachandrena eclaytoniae se, fq, forbesii 
se, fq, hippotes se, fq, mariae se, fq. 
Diptera (7)—Syrph.: Brachypalpus frontosus, Chilosia punetu- 
lata, Sphaerophoria; Empid:: Rhamphomyia limbata fq, priapulus 
fq; Conop.: Myopa vesiculosa ab; Musc.: Pseudopyrellia. 
On pistillate flowers: 
Long-tongued Bees (3)—Bomb.: Bombus americanorum 9; 
Megachil.: Osmia pumila 4; Nomad.: Nomada salicis 4, type. 
Short-tongued Bees (6)—Halict. (2): Chloralictus ecressonii, 
tegularis fq, Curtisapis forbesii; Andren. (3): Andrena earlini, 
erythronii, Trachandrena rugosa. 
Other Hymenoptera (5)—Vesp.: Vespula germanica; Pompil.: 
Cryptocheilus conicus; Ichneumon.: Glypta rufiscutellaris fq; 
Tenthredin.: Dolerus arvensis, Macrophya epinota, pleuricincta, 
Macroxyela. 
Diptera (18)—Syrph.: Eristalis dimidiatus, Melanostoma ob- 
scurum, Mesogramma marginata, Platychirus quadratus, Syrphus 
americanus, torvus; Empid.: Rhamphomyia gilvipilosa; Conop.: 
Myopa pilosa ab, in cop; Tachin.: Gonia capitata, exul; Sarcophag: 
Cynomyia; Anthomy.: Coenosia antennalis, Hyetodosia, Mydaea 
fusca, Phorbia aera, platura fq; Scatophag.: Secatophaga; Seps.: 
Sepsis. 
Coleoptera (1)—Chrysomel.: Orsodachna. 
Salix cordata (9:76-7)—Blooms March 18—April 30; 123 
visitors observed, March 25—April 29; Mis, Y. 
On staminate flowers: 
Long-tongued Bees (6)—Megachil.: Osmia pumila ¢ 9, ab; 
Nomad.: Nomada denticulata , type, illinoensis ¢ 9, fq, type, sayi 
3, Xanthidium luteoloides ¢, luteolum ¢ 9, ab. 
Short-tongued Bees (16)—Halict. (9): Augochlora viridula, 
Chloralictus illinoensis, tegularis, Odontalictus, Oxystoglossa con- 
fusa fq, similis type; Andren.: Andrena dunningii <4, erythro- 
gastra gi 9, se, ab, in cop, mandibularis <4, type, pruni 4, fq, 
salicacea ¢ 9, fq, sayi J 2 ab, in cop, Opandrena ecressonii ¢ 9, ab, 
dubia 4, type, Trachandrena hippotes 4, fq, nuda 9. 
