CHARLES ROBERTSON 171 
Diptera (7)—Syrph.: Paragus tibialis, Syritta; Tachin.; 
Apinops, Cistogaster occidua ; Sarcophag.: Helicobia helicis ; Muse.: 
Lucilia caesar; Anthomy.: Phorbia platura. 
Lepidoptera (1)—Nymphal.: Phyciodes, 
Potentilla monspeliensis norvegica.—Blooms May 19-Novem- 
ber 19; 23 visitors observed, July 25, 27; Mi, Y. 
Short-tongued Bees (13)—Halict.: Agapostemon radiatus ¢, 
fq, Chloralictus pilosus 4, sparsus 9, sc, fq, versatus ¢ 9, se, fq, 
Evylaeus pectoralis 2, Odontalictus ¢, Oxystoglossa similis 9, se, 
Seladonia ¢ 9, fq; Sphecodini: Sphecodes arvensis 2, Sphecodium 
cressonii 2 ; Prosopid.: Prosopis pygmaea ¢ 9, fq, ziziae 9; Panurg.: 
Calliopsis andreniformis ¢. 
Other Hymenoptera (1)—Ozybel.: Notoglossa frontalis fq. 
Diptera (8)—Syrph.: Mesogramma geminata, marginata, 
Sphaerophoria fq, Syritta; Conop.: Onecomyia; Tachin.: Gymno- 
prosopa; Sarcophag.: Helicobia helicis; Anthomy.: Phorbia acra. 
Lepidoptera (1)—Lycaen.: Everes. 
Prunus americana (15: 435-6).—Blooms March 31—May 5; 76 
visitors observed, April 17-29; Mis, W. 
Long-tongued Bees (14)—Ap.: Apis se, ab; Bomb.: Bombus 
americanorum 92, impatiens 9; Ceratin.: Ceratina 4, ab, Zaodonto- 
merus 4, fq; Nomad.: Gnathias ovatus ¢, Heminomada ¢ 9, fq, 
Holonomada superba ¢, Nomada denticulata ¢, illinoensis ¢ 9, 
Phor ¢, Xanthidium luteoloides ?, luteolum 9; Lucer.: Tetralonia 
dilecta ¢ 9, ab. 
Short-tongued Bees (26)—Halict (2): Agapostemon radiatus, 
Chloralictus pilosus se, ab, pruinosus se, ab, sparsus, tegularis, ver- 
satus se, ab, zephyrus sc, Evylaeus arcuatus, Halictus lerouxii se, 
Seladonia se; Sphecodini: Sphecodes arvensis; Prosopid.: Prosopis 
pygmaea ¢'; Collet.: Colletes inaequalis ¢ 2, fq; Andren.: Andrena 
erythrogastra ¢ 9, ab, erythronii 9, se, illinoensis ¢, fq, mandibu- 
laris 2, pruni J, salicis 4, sayi f 9, se, fq, Opandrena ecressonii ¢ 9, 
se, ab, miserabilis ¢ 9, se, ab, Parandrena ¢ 2, ab, Trachandrena 
claytoniae ¢ 2, se, ab, forbesii 4, hippotes ¢ 9, se, fq. 
Other Hymenoptera (3)—Vesp. Polistes pallipes, variatus; 
Ichneumon.: Bathycetes. 
Diptera (23)—Syrph.: Brachypalpus frontosus, Chrysogaster 
ontario, Eristalis dimidiatus, Helophilus similis, Mesogramma 
geminata, marginata ab, Orthoneura nitida, Platychirus hyper- 
boreus, Sphaerophoria, Syrphus americanus, torvus; Empid.: 
Empis otiosa fq, Rhamphomyia priapulus; Bombyli.: Bombylius 
