CHARLES ROBERTSON 157 
PONTEDERIACEAE. 
Pontederia cordata.—Blooms July 1-September 15; 2 visitors 
observed, August 8, September 15; Ma (Mas), R. 
Long-tongued Bees (1)—Eucer.: Florilegus ¢. 
Lepidoptera (1)—Papilion.: Eurymus. 
PORTULACACEAE. 
Claytonia virginica (2:177-8).—Blooms March 16—May 24; 
103 visitors observed, April 8-May 11; Mi, W. 
Long-tongued Bees (21)—Ap.; Apis se, ab; Bomb. (2) : Bombias 
auricomus, Bombus americanorum, consimilis, impatiens; Ceratin.: 
Ceratina ¢ 2, Zaodontomerus ¢; Megachil.: Ceratosmia ¢ 9, fq, 
Osmia atriventris 9, pumila ¢ 9; Nomad.: Gnathias cuneatus ¢, 
ovatus 9, fq, Heminomada 9, Holonomada affabilis 2, Nomada eres- 
sonii ¢ 9, illinoensis 4, sayi ¢ 9, Phor 9, Xanthidium luteoloides 
ob 2, type; Eucer.: Tetralonia belfragei ¢ 9, dilecta 9. 
Short-tongued Bees (37)—Halict. (2): Agapostemon radiatus 
se, splendens, Augochlora viridula, Chloralictus cressonii, illino- 
ensis, pilosus, sparsus, versatus sc, fq, zephyrus, Curtisapis coriacea 
se, Evylaeus arcuatus, foxii, pectoralis, truncatus, Halictus lerouxii 
se, ab, Odontalictus, Oxystoglossa confusa fq, type, similis, Sela- 
donia se, ab; Sphecodini: Sphecodes arvensis; Collet.: Colletes inae- 
qualis ¢ 9; Andren.: Andrena arabis 9, ecarlini ¢ 9, fq, dun- 
ningi 9, erythrogastra 2, erythronii 2, mandibularis Q nasonii 
9, pruni 2, sayi ¢ ?, Opandrena cressonii ¢ 2, se, fq, miserabilis 
3 9, se, fq, personata ¢, fq, Ptilandrena erigeniae ¢ 92, se, ab, 
oligolege, Trachandrena claytoniae ¢ 9, se, fq, type, forbesii 2, se, 
fq, rugosa ¢. 
Diptera (35)—Syrph.: Allograpta, Eristalis dimidiatus, lati- 
frons, Helophilus similis, Melanostoma obscurum, Mesogramma 
geminata, marginata, Paragus bicolor fq, Rhingia, Sphaerophoria, 
Syritta, Syrphus americanus, arcuatus, ribesii, torvus; Empid.: 
Empis humilis, nuda, otiosa; Bombyli.: Bombylius major fq; 
Conop.: Myopa vesiculosa; Sarcophag.: Calliphora erythrocephala, 
Cynomyia, Helicobia helicis, 4-setosa, Sarcophaga sinuata; Musc.: 
Lucilia sylvarum, Phormia regina, Pseudopyrellia; Anthomy.: 
Coenosia antica, Limnophora, Phorbia acra, platura; Scatophag.: 
Seatophaga; Seps.: Prochyliza, Sepsis. 
Lepidoptera (9)—Nymphal.: Phyciodes, Vanessa atalanta; 
Lycaen.: Everes; Papilion.: Eurymus, Iphiclides, Pieris, Pontia; 
Hesperi.: Thanaos icelus, juvenalis. 
Coleoptera (1)—Coccinell.: Megilla f, n. 
