CHARLES ROBERTSON 177 
Houstonia purpurea calycosa (5: 275).—-Blooms May 18—July 
4; 37 visitors observed, May 25—June 12; Mi, W. 
Long-tongued Bees (9)—Ap.: Apis; Bomb.: Bombias separa- 
tus 9; Ceratin.: Ceratina ¢ 9, sec, ab; Megachil.: Neotrypetes pro- 
ductus 4, type, Alcidamea simplex 4; Nomad. (2) : Centrias ameri- 
canus, Holonomada affabilis, superba; Eucer.: Tetralonia rosae ¢. 
Short-tongued Bees (9)—Halict. (2): Chloralictus albipennis 
s¢, pilosus se, versatus sc, Evylaeus pectoralis, Odontalictus, Oxysto- 
glossa confusa sc, similis sc, Seladonia; Panurg.: Calliopsis andreni- 
formis ¢ 9, se, ab. 
Diptera (9)—Syrph.: Eristalis dimidiatus, Mesogramma margi- 
nata, Paragus bicolor, tibialis, Sphaerophoria sc, ab, Syritta; 
Bombyli.: Bombylius atriceps; Tachin.: Archytas analis, Spallan- 
zania. 
Lepidoptera (7)—Nymphal.: Charidryas fq; Lycaen.: Chryso- 
phanus fq; Papilion.: Pieris, Pontia; Hesperi.: Ancyloxypha ab, 
Pholisora catullus, Polites. 
Coleoptera (3)—Curculion. (f, n): Centrinites, Centrinus seu- 
tellum-album ; Scarabae.; Trichius piger sf, ab. 
RUTACEAE 
Ptelea trifoliata (9: 155-7) —Blooms May 7—June 23; 68 vis- 
itors observed, May 22—June 8; Mis, W. 
Long-tongued Bees (5)—Ap.: Apis se, fq; Bomb.: Bombias 
auricomus 9, sc; Ceratin.: Ceratina 9, se, ab; Nomad.: Gnathias 
ovatus 9; Eucer.: Tetralonia dilecta Q, sc. 
Short-tongued Bees (28)—Halict. (2): Agapostemon radiatus, 
viridulus, Chloralictus cressonii sc, pilosus, sparsus sc, tegularis se, 
versatus sc, Curtisapis coriacea, Halictus lerouxii, Odontalictus, 
Oxystoglossa confusa; Sphecodini: Drepanium fq; Prosopid.: 
Prosopis sayi 4, ziziae ¢; Collet.: Colletes eulophi 4, inaequalis 9, 
se; Andren.: Andrena platyparia ¢ 9, sc, Opandrena cressonii Q, 
miserabilis 9, sc, fq, serotina 9, se, fq, Trachandrena clay- 
toniae 9, crataegi 9, se, forbesii 9, heraclei 9, se, hippotes 
9, se, ab, type, nuda Q, se, fq, rugosa 9, spiraeana 9. 
Other Hymenoptera (14)—Sphec.: Sphex vulgaris; Scoli.: 
Campsomeris; Philanth.: Cerceris compar; Eumen.: Ancistrocerus 
tigris, unifasciatus, Eumenes fraternus, Leionotus clypeatus, 
foraminatus, scrophulariae, ziziae; Crabron.: Solenius; Oxybel.: 
Notoglossa americana, inornata; Chalcid.: Leucospis. 
Diptera (19)—Stratiomy.: Stratiomyia meigenii; Syrph.: Mal- 
lota cimbiciformis, Myiolepta nigra, Sphaerophoria, Syritta, Volu- 
cella vesiculosa; Empid.: Empis distans, levicula; Conop.; Conops 
