102 FLOWERS AND INSECTS—XXVI 
Seladonia sc, 4; Sphecodini: Proteraner <1, 6; Prosopd.: Prosopis 
sayi J, 1; Andren.: Andrena ecarlini 9, 1, geranii 4’, 3, nasonii 9, 
se, 9, Opandrena cressonii ¢ 9, sec, 10, miserabilis 9, 1, personata 
3 9, 13. 
Other Hymenoptera (2: 2)—Humen.: Leionotus foraminatus 1; 
Sapyg.: Sapyga 1. 
Diptera (9:21)—Syrph.: Mesogramma geminata 4, Syrphus 
americanus f, 6, ribesii f, 5, torvus f, 1; Empid.: Empis humilis 1, 
nuda 1, Pachymeria 1; Bombyli.: Bombylius major 1; Tachin.: 
Siphona 1. 
Arabis laevigata.—Blooms April 10—May 18; 13 species and 53 
individuals observed, April 238, 27, May 5; Mi, W. 
Long-tongued Bees (4:8)—Ceratin.: Ceratina 9, 4, Zaodon- 
tomerus 6, 2; Megachil.: Osmia pumila 9, 1; Nomad.: Gnathias 
ovatus Q, 1. 
Short-tongued Bees (7:40, 2)—Halict.: Chloralictus obscurus 
1, versatus se, 9, Evylaeus 4-maculatus 1, Oxystoglossa confusa se, 8, 
pura 1; Andren.: Andrena arabis se, 18, type, nasonii se, 2. 
Diptera (2:5)—Syrph.: Allograpta f, 1; Tachin.: Siphona 4. 
Arabis virginica.—Blooms March 20-May 15; 11 visitors ob- 
served, April 20, May 3, 8; Mi, W. 
Long-tongued Bees (1)—Nomad.: Gnathias ovatus 9. 
Short-tongued Bees (9)—Halict. (9): Agapostemon radiatus, 
Chloralictus versatsus, zephyrus, Halictus lerouxii, Oxystoglossa 
confusa, similis, Seladonia; Andren.: Opandrena cressonii 9; 
miserabilis <%. 
Diptera (1)—Anthomy.: Anthomyiella. 
Capsella bursa-pastoris (int).—Blooms March 20—December 1; 
60 visitors observed, April 16-June 1; Mi, W. 
Long-tongued Bees (4)—Ap.: Apis fq; Megachil.: Prochelos- 
toma ¢; Nomad.: Nomada parva 9; Hucer.: Tetralonia dilecta ¢. 
Short-tongued Bees (22)—Halict. (2): Chloralictus coreopsis 
se, eressonil, sparsus se, ab, tegularis sec, versatus sec, zephyrus se, 
Curtisapis forbesii sc, Dialictus se, Evylaeus foxii se, fq, pectoralis 
se, Halictus lerouxii se, Odontalictus, Oxystoglossa similis se, fq, 
Seladonia sc; Prosopid.: Prosopis pygmaea 6; Andren.: Andrena 
arabis 9, se, fq, nasonii 9, sec, Opandrena cressonii ¢ 9, se, fq, 
miserabilis 4, personata ¢' 2, se, fq, Trachandrena claytoniae ¢ 9, 
se, forbesii ¢. 
Other Hymenoptera (1)—Vesp.: Polistes pallipes. 
