CHARLES ROBERTSON 105 
Short-tongued Bees (12: 35)—Halict.: Agapostemon radiatus ], 
Chloralictus coreopsis 1, tegularis 1, versatus 1, Evylaeus arcuatus 1, 
pectoralis 6, Oxystoglossa similis 6, Seladonia 4; Prosopid.: Prosopis 
pygmaea 4, sayi 2, ziziae 5; Andren.: Opandrena personata 3. 
Other Hymenoptera (4: 6)—Humen.: Leionotus elypeatus 1, 
histrionalis 3; Pompil.: Anoplius illinoensis 1, Psammochares tene- 
brosus 1. 
Diptera (16: 114)—Stratiomy.: Nemotelus 1; Syrph.: Eristalis 
dimidiatus 1, Helophilus, similis 1, Mesogramma marginata 33, 
Paragus bicolor 1, tibialis 1; Conop.: Zodion fulvifrons 6; Tachin.: 
Apinops 1, Cistogaster occidua 1, pallasii 1, Ocyptera tenuis 1; 
Sarcophag.: Helicobia helicis 1; Musc.:; Pseudopyrellia 1; An- 
thomy.: Limnophora 1, Phorbia acra 52, platura 12. 
Radicula obtusa.—Twenty-three visitors observed, May 1, 3, 8; 
MY, 
Long-tongued Bees (3)—Ap.: Apis fq; Megachil.: Alcidamea 
simplex 2; Nomad.: Nomada illinoensis 9. 
Short-tongued Bees (11, 2)—Halict.: Chloralictus albipennis, 
pilosus, versatus se, fq, zephyrus, Evylaeus arcuatus, Odontalictus, 
Oxystoglossa confusa, similis fq, Seladonia fq; Andren.: Andrena 
erythrogastra, Opandrena cressonii. 
Other Hymenoptera (3)—Crabron.: Clytochrysus; Tiphi.: Ti- 
phia clypeata; Ichnewmon.: Metopius terminalis. 
Diptera (6)—Syrph.: Sphaerophoria, Syrphus americanus; 
Tachin.: Peleteria; Sarcophag.: Sarcophaga sinuata ; Musc.: Lucilia 
sylvarum ; Anthomy.: Limnophora. 
Radicula palustris—Blooms May 6—October 16; 6 species and 
22 individuals observed, May 31, June 3; Mi, Y. 
Short-tongued Bees (4: 18, 2?)—Halict.: Chloralictus tegularis 
se, 2, versatus se, 9, zephyrus 2, Evylaeus pectoralis 5. 
Diptera (2: 4)—Syrph.: Mesogramma marginata sf, 3; An- 
thomy.: Phorbia platura 1. 
Sisymbrium canescens.—Blooms April 13—June 8; 13 visitors 
observed, May 2, 3; Mi, Y. 
Short-tongued Bees (11)—Halict. (2): Chloralictus pilosus se, 
fq, pruinosus se, sparsus, tegularis, versatus sc, fq, Evylaeus pecto- 
ralis, Oxystoglossa similis se, fq, Seladonia sc; Andren.:; Andrena 
nasonii ¢, Opandrena cressonii 9, se, personata J Q, se. 
Diptera (2)—Tachin.: Gymnosoma; Anthomy.: Phorbia acra. 
