CHARLES ROBERTSON 147 
Long-tongued Bees (2:6)—Bomb.: Bombus americanorum 9, 
1; Ceratin.: Ceratina 9, se, 5. 
Short-tongued Bees (9:86)—Halict.: Augochlora viridula 9, 
se, 1, Chloralictus obscurus 9, se, 1, sparsus 9, 1, versatus 9, se, 30, 
Curtisapis fuscipennis ?, sc, 14, Evylaeus pectinatus 9, se, 1, pee- 
toralis ?, 1, 4-maculatus ¢ 9, se, 22, Oxystoglossa confusa 9, se, 15. 
Other Hymenoptera (1: 1)—Chalcid.: Smicra debilis. 
Diptera (6:11)—Syrph.: Allograpta 1, Mesogramma geminata 
5, marginata 1, Baccha fuscipennis 1; Bombyli. (f, n): Anthrax 
sinuosa 2, Argyramoeba oedipus 1. 
Gaura biennis (5: 273).—Blooms July 2—October 24; 7 visitors 
observed, August 23—September 10; Ma, W. 
Long-tongued Bees (5)—Ap.: Apis se; Bomb.: Bombus ameri- 
eanorum ¥, sc, ab, impatiens §%, ¢; Megachil.: Megachile mendica 
9, ¢; Eucer.: Melissodes bimaculata 9, se. 
Short-tongued Bees (1)—Halict.: Chloralictus versatus 9, ¢, n. 
Diptera (1)—Syrph.: Syrphus americanus f, n. 
Ludvigia alternifolia (5: 271).—Blooms July 11—August 23; 17 
species and 40 individuals taken on August 3, 8; Mi, Y. 
Long-tongued Bees (3:4)—Bomb.: Bombus americanorum 4, 
1; Megachil.: Megachile brevis 9, 1, petulans 4, 2. 
Short-tongued Bees (10: 32)—Halict. (2): Chloralictus pilosus 
se, 6, pruinosus 2, sparsus ¢, 1, versatus sc, 13, Halictus parallelus 
se, 1, Odontalictus se, 4, Oxystoglossa confusa 1, pura 1, similis se, 
1, Seladonia 2. 
Other Hymenoptera (2:2)—Philanth.: Philanthus ventilabris 
1; Crabron.: Anacrabro 1. 
Diptera (1:1)—Mycetophil.: Sciara atrata 1, n. 
Lepidoptera (1: 1)—Lycaen.: Everes 1. 
Ludvigia polycarpa (5:272).—Eighteen species and 59 indi- 
viduals, August 3-19; Mi (Pol), Y. 
Short-tongued Bees (5:40)—Halict.; Chloralictus cressonii 9, 
1, versatus 9, se, 36, zephyrus ?, 1, Evylaeus pectoralis ¢, 1, Oxy- 
stoglossa similis 9, 1. 
Other Hymenoptera (6:8)—Scoli.: Elis interrupta 1; Phi- 
lanth.: Cerceris compacta 1; Vesp.: Polistes pallipes 1, variatus 1; 
Pompil.: Lophopompilus atrox 2, philadelphicus 2. 
Diptera (7: 11)—Syrph.: Mesogramma marginata 4, polita 1; 
Tachin.: Archytas analis 1, Belvosia unifasciata 1, Spallanzania 1; 
Sarcophag.: Sarcophaga sinuata 2; Anthomy.: Limnophora 1. 
