CHARLES ROBERTSON 25 
Diptera (22)—Stratiomy.: Stratiomyia meigenii; Syrph.: 
Allograpta, Mesogramma marginata, Syritta fq; Conop.: Conops 
brachyrrynchus, Oncomyia, Physocephala tibialis, Zodion nanellum ; 
Tachin.: Archytas analis fq, Linnaemyia fq, Ocyptera lata, Phor- 
antha purpurascens, Senotainia trilineata fq, Trichopoda pennipes, 
Trichophora; Sarcophag.: Helicobia helicis, Sarcophaga cimbicis; 
Musc.: Compsomyia fq, Lucilia sylvarum, Musca, Pseudopyrellia 
fq; Anthomy.: Calythea. 
Rhus glabra (7: 111-12)—Blooms May 27-—July 7; 114 vis- 
itors observed, June 5—July 7; Mis, Y. 
On staminate flowers (57) :— 
Long-tongued Bees (4)—Bomb.: Bombias separatus %, sc; 
Stelid.: Microstelis 9; Megachil.: Trypetini: Neotrypetes truncatus 
3b 2, se, fq; Coelioxyini: Coelioxys sayi 9. 
Short-tongued Bees (11)—Halict.: Curtisapis fuscipennis 9, se, 
Evylaeus arcuatus ¢ 9, se, ab, Oxystoglossa confusa ?, se; Sphe- 
eodini: Sphecodes arvensis 2; Prosopid.: Prosopis illinoensis 9, 
ziziae ¢ 9, sf; Collet.: Colletes aestivalis J 9, nudus ¢; Andren.: 
Andrena platyparia 9, se, Opandrena cressonii ?, se, Trachandrena 
nuda ¢. 
Other Hymenoptera (10)—Bembic.: Bicyrtes ventralis; 
Philanth.: Cerceris compar, fumipennis, insolita, Philanthus pune- 
tatus; Eumen.: Ancistrocerus campestris, Leionotus arvensis, 
Monobia, Zethus; Crabron.: Solenius. 
Diptera (29)—Stratiomy.: Stratiomyia apicula, meigenii, 
quaternaria; Syrph.: Baccha fuscipennis, Ceria, Eristalis dimidi- 
atus, flavipes, tenax, transversus, Mallota cimbiciformis, posticata, 
Mesogramma geminata, Orthoneura nitida, Sphaerophoria, Sphe- 
gina rufiventris, Syrphus americanus, ribesii; Empid.: Parempis 
fq, Bombyli.: Anthrax alternata, sinuosa f, Bombylius atriceps; 
Conop.: Conops brachyrrhynchus, Zodion fulvifrons, nanellum; 
Tachin.: Hypostena variabilis, Siphona; Musc.: Lucilia caesar, 
Morellia; Anthomy.: Limnophora. 
Lepidoptera (3)—Nymphal.: Neonympha; eens Cyaniris, 
Thecla calanus. 
On staminate and pistillate flowers (18) :— 
Long-tongued Bees (1)—Ceratin.: Ceratina 9, se. 
Short-tongued bees (10)—Halict.; Agapostemon radiatus 9, 
se, viridulus 9, se, Chloralictus pilosus 9, sc, pruinosus ¢ 9, se, 
sparsus 9, sc, ab, versatus ¢ 9, se, ab, zephyrus ¢ 9, se, ab, Halictus 
lerouxii ¢ 9, se, fq; Collet.: Colletes eulophi ¢ 9, ab; Andren.: 
Opandrena serotina ¢ 9, se, fq. 
