CHARLES ROBERTSON 27 
Diptera (8)—Syrph.: Syrphus americanus; Sarcophag.: Cyno- 
myia fq, Helicobia helicis, 4-setosa, Sarcophaga: sinuata; Musc.: 
Phormia regina; Anthomy.: Phorbia platura; Scatophag.: Scato- 
phaga. 
APOCYNACEAE 
Apocynum androsaemifolium.—Blooms May 10—July 28; 12 
visitors observed, July 16, 25; Mis, W. 
Long-tongued Bees (1)—Nomad.: Centrias americanus ?, mp. 
Short-tongued Bees (5, no pol.) —Halict.: Chloralictus versatus 
9, zephyrus 2, Oxystoglossa confusa ¢, similis ¢ 9; Prosopid.: 
Prosopis sayi 9. 
Other Hymenoptera (1)—Sphec.: Sphex vulgaris, no pol. 
Diptera (5, n)—Tachin.: Linnaemyia, Trichophora; Musc.: 
Graphomyia, Lucilia sylvarum ; Anthomy.: Phorbia acra. 
Apocynum cannabinum (4:70).—Blooms May 18-August 12; 
48 visitors observed, June 1—July 17; Mis, W. 
With pollinia (9) :— 
Long-tongued Bees (3)—Ap.: Apis lp; Nomad.;: Centrias ameri- 
eanus ¢ 9, fq, mp, lp; Holonomada affabilis ¢, lp. 
Short-tongued Bees (3, mp)—Halict. (2) : Agapostemon radia- 
tus, Oxystoglossa confusa; Collet.: Colletes productus 0, type. 
Other Hymenoptera (3)—Sphec.: Isodontia apicalis t; Bembic.: 
Bicyrtes ventralis mp ; Ewmen.: Leionotus foraminatus t. 
Without pollinia (39) :— 
Long-tongued Bees (3)—Stelid.: Microstelis 9; Megachil.: 
Megachilini: Chelostomoides 2; Coelioxyini: Coelioxys 8-dentata 
o 2. 
Short-tongued Bees (6)—Halict.: Augochlora viridula Q, 
Chloralictus versatus ¢ 2, Seladonia 2; Prosopid.: Prosopis ziziae 
2; Collet.: Colletes aestivalis ¢; Macropid.: Macropis ¢, fq. 
Other Hymenoptera (4)—Sphec.: Priononyx atrata, thomae, 
Sphex vulgaris; Larr.: Astatus unicolor. 
Diptera (21, n)—Mycetophil.: Sciara atrata; Syrph.: Allo- 
grapta, Eristalis dimidiatus, Helophilus laetus, Sphaerophoria, 
Tropidia mamillata, quadrata; Empid.: Parempis; Bombyli.: 
Anthrax alternata, Bombylius atriceps; Tachin.: Archytas analis,, 
Cistogaster occidua, Linnaemyia, Ocyptera tenuis, Spallanzania, 
Trichophora; Sarcophag.: Helicobia helicis; Musc.: Compsomyia, 
Phormia regina ; Anthomy.: Limnophora, Phorbia acra. 
Lepidoptera (2, n)—Nymphal.: Argynnis; Lycaen.: Thecla 
calanus. 
