22 -FLOWERS AND INSECTS—XXVI 
Diptera (15)—Syrph.: Helophilus similis 1, Syrphus ribesii 3; 
Tachin.: Gonia capitata fq; Sarcophag.: Calliphora erythrocephala 
1, vomitoria 3, Cynomyia 1, Helicobia 4-setosa 1; Musc.: Lucilia 
caesar 4, Muscina 2, Pseudopyrellia 4; Anthomy.: Hydrotaea 3, 
Hyetodosia 25; Agromyz.: Aulacigaster 2; Scatophag.: Scatophaga 
12; Seps.: Prochyliza 10. 
Lepidoptera (3)—Nymphal.: Huvanessa 4, Polygonia comma 2, 
Vanessa atalanta 2. 
AIZOACEAE 
Mollugo verticillata (int, 5: 274).—Blooms June 25—October 
12; 18 species and 29 individuals observed, July 16, August 11, 21; 
Mi, W. 
Short-tongued Bees (5: 13)—Halict.: Chloralictus pilosus 4, 1, 
sparsus 9, se, 4, tegularis J 9, 3, versatus J 9, se, 4, Seladonia J, 1. 
Other Hymenoptera (1: 3)—Philanth.: Cerceris finitima 3. 
Diptera (6: 9)—Syrph.: Mesogramma marginata sf, 4, Paragus 
tibialis 1, Pipiza pulchella 1; Conop.: Zodion nanellum 1; Sarco- 
phag.: Helicobia 4-setosa 1; Musc.: Pseudopyrellia 1. 
Coleoptera (1: 2)—WMalach.: Collops 2. 
ALISMACEAE 
Alisma plantago aquatica—Blooms July 4-August 13; 138 
species and 101 individuals observed, July 20, 21, 1909; Mi, W. 
Short-tongued Bees (6:52)—Halict.: Agapostemon radiatus dj, 
1, Chloralictus coreopsis 9, 1, cressonii (J, 3, sparsus 9, 8, tegularis 
?, 31, Oxystoglossa similis 9, 8. 
Diptera (7:49)—Syrph.: Mesogramma marginata 32, Paragus 
bicolor 2, tibialis 2, Sphaerophoria 10, Syritta 1; Tachin.: Gymno- 
prosopa 1, Senotainia rubriventris 1. 
Sagittaria latifolia—Blooms July 1—-September 25; 122 indi- 
viduals, belonging to 52 species, observed July 25-August 30; 
Mi, W. 
On staminate flowers (24:42) :— 
Long-tongued Bees (2:2, 2)—Ceratin.: Ceratina 9, 1; Mega- 
chil.: Megachile brevis 9, se, 1. 
Short-tongued Bees (5:18, 9, se)—Halict.: Chloralictus sparsus 
5, versatus 7, Evylaeus nelumbonis 1, Odontalictus 4, Oxystoglossa 
confusa 1. 
Other Hymenoptera (4:4)—Humen.: Leionotus anormis 1, 
ziziae 1; Larr.: Tachytes aurulentus 1; Nysson.: Pseudoplisus 
phaleratus 1. 
