170 FLOWERS AND INSECTS—XXVI 
Geum vernum (15:439-40).—Blooms April 12—May 24; the 
first 100 individuals, belonging to 18 species, were taken May 1-15; 
Mi, Y. 
Long-tongued Bees (2:17)—Ceratin.: Zaodontomerus 4, 1; 
Nomad.: Nomada parva 6 Q, 16. 
Short-tongued Bees (13: 67)—Halict. (2) : Chloralictus sparsus 
7, tegularis 1, versatus 4, Evylaeus foxii 1, pectoralis 3, Oxystoglossa 
confusa sec, 3, similis sc, 6, Seladonia 3; Sphecodini: Sphecodium 
eressonii 1; Prosopid. (¢): Prosopis pygmaea 2, sayi 1, ziziae 2; 
Andren.: Opandrena personata ¢ 9, 33. 
Diptera (3:16)—Syrph.: Mesogramma geminata 2, Paragus 
bicolor 3; Tachin.: Siphona 11. 
Gillenia stipulacea (16: 169-70)—Blooms June 3-July 7; 25 
visitors observed, June 15-30; Ma, W. 
Long-tongued Bees (11)—Ceratin.: Ceratina 9, se, ab, Zaodon- 
tomerus ¢'; Megachil.: Trypetini: Neotrypetes truncatus J Q, se, 
fq; Osmiini: Alcidamea simplex ¢ 9, se, ab, truncata @, se, Leu- 
cosmia 9, sc, Osmia atriventris 9, distincta 2, sc, ab; Megachilini: 
Megachile addenda 2, se; Nomad.: Holonomada affabilis 2; Antho- 
phor.: Anthemoessa <j. 
Short-tongued Bees (6)—-Halict.: Chloralictus sparsus 9, ¢, fq, 
n, versatus 9, sc, Evylaeus pectoralis ¢ 9, sc, 4-maculatus 9; 
Panurg.: Calliopsis andreniformis ', Heterosarus ¢ 9, se, ab. 
Diptera (4)—Syrph. (f, n): Baccha fuscipennis, Pipiza nigri- 
barba; Bombylt.: Bombylius atriceps; Conop.: Stylogaster bian- 
nulata fq. 
Lepidoptera (4)—Papilion.: Euphoeades, Laertias; Hespert.: 
Thorybes bathyllus, pylades. 
Potentilla canadensis (15:441)—Blooms April 23-June 17; 
30 visitors observed, May 14-June 2; Mi, Y. 
Long-tongued Bees (8)—Bomb.: Bombus americanorum 9; 
Ceratin.: Ceratina ¢ 9, fq, Zaodontomerus ¢'; Stelid.: Microstelis 
3; Megachil.: Alcidamea simplex (J, Osmia pumila 2; Nomad.: 
Centrias americanus 3“, Nomada parva ¢. 
Short-tongued Bees (10)—Halict. (2): Chloralictus versatus, 
Evylaeus pectoralis, Odontalictus, Oxystoglossa confusa sec, ab, 
similis se, ab, Seladonia; Sphecodini: Proteraner, Sphecodium 
eressonii; Prosopid.: Prosopis ziziae ¢:; Andren.: Opandrena per- 
sonata J 9, ab. 
Other Hymenoptera (4)—Humen.: Leionotus anormis, clypeatus 
fq, histrionalis, ziziae. 
