CHARLES ROBERTSON 153 
tomerus 1; Megachil.: Ceratosmia 1, Diceratosmia 7, Osmia atri- 
ventris 3, pumila 6; Lucer.: Tetralonia belfragei 17, dilecta 5. 
Short-tongued Bees (9:21)—JWHalict.: Agapostemon radiatus 1, 
Chloralictus coreopsis 1, pilosus 3, versatus 1, Curtisapis coriacea 
2, Oxystoglossa pura 6, similis 2; Andren.: Andrena pruni 1, Pti- 
landrena polemonii 4. 
Diptera (2:2)—Syrph.: Pipiza femoralis 1; Bombyli.: Bom- 
bylius major 1. 
Lepidoptera (4: 20)—Papilion.: Eurymus 5; Hesperi.: Thanaos 
juvenalis 6; Sphing.: Hemaris thysbe 1; Noctu.; Plusia simplex 8. 
POLYGALACEAE 
Polygala sanguinea.—Blooms June 8—-August 27; 4 visitors 
observed, August 26, 27; Mas, R. 
Long-tongued Bees (2, ¢)—Epeol.: Triepeolus cressonii; 
Eucer.: Melissodes nivea fq. 
Short-tongued Bees (1)—Panurg.: Calliopsis andreniformis ¢ 
9, se, fq. 
Diptera (1)—Bombyli.: Systoechus. 
POLYGONACEAE 
Polygonum acre.—Blooms June 24—October 26; 10 visitors 
observed, August 26—-September 16; Mis, W. 
Long-tongued Bees (1)—Ap.: Apis. 
Short-tongued Bees (1)—Halict.: Augochlora viridula 9. 
Other Hymenoptera (5)—Vesp.: Polistes pallipes; Humen.: 
Ancistrocerus capra, Eumenes fraternus; Crabron.: Xestocrabro 
6-maculatus; Nysson.: Pseudoplisus divisus. 
Diptera (3)—Syrph.: Platychirus quadratus, Syritta; Tachin.: 
Archytas aterrima fq. 
Polygonum amphibium.—Blooms August 2—October 30; 1 vis- 
itor observed, August 30; Mis, R. 
Other Hymenoptera—Vesp.: Vespula germanica. 
Polygonum hydropiper.—Blooms July 26—October 6; 3 visitors 
observed, September 16; Mis, W. 
Short-tongued Bees—Halict.; Halictus lerouxii 9. 
Other Hymenoptera—Vesp.: Polistes variatus. 
Diptera—Tachin.; Tachina mella. 
Polygonum hydropiperoides (9: 72-3).—Blooms July 11-Sep- 
tember 20; 73 visitors observed, August 30, September 20; Mis, W. 
Long-tongued Bees (4)—Ap.: Apis; Ceratin.: Ceratina Q; 
Megachil.: Megachile brevis ¢, mendica 9. 
