CHARLES ROBERTSON 135 
Short-tongued Bees (8)—dHalict.: Agapostemon radiatus ¢ 9, 
se, Curtisapis coriacea 9, Evylaeus arcuatus ?, Halictus lerouxii 9, 
Seladonia ¢ 9, in cop; Collet.: Colletes brevicornis 2, fq, eulophi 
& 2, se, ab, in cop; Panurg.: Calliopsis andreniformis ¢ 9, se, ab, 
in cop. 
Other Hymenoptera (7)—Sphec.: Priononyx atrata, thomae, 
Sphex gracilis; Scoli.: Elis 5-cincta; Ewmen.: Leionotus arvensis, 
dorsalis, Pterochilus. 
Diptera (7)—Syrph.: Tropidia mamillata; Bombyli.: Anthrax 
parvicornis, sinuosa fsp, Bombylius atriceps, Exoprosopa fasciata ; 
Conop.: Physocephala tibialis, Stylogaster biannulata. 
Lepidoptera (6, n)—Papilion.: Laertias, Pontia; Hesperi.: 
Epargyreus, Thanaos juvenalis; Sphing.: Hemaris thysbe; Noctu.: 
Schinia. 
Robinia pseudacacia (int).—Blooms April 21—May 28; 11 vis- 
itors observed, May 9-25; Ma, R. 
Birds (1)—Trochil.: Trochilus ab. 
Long-tongued Bees (7)—Ap.: Apis; Bomb. (2): Bombias auri- 
comus fq, scutellaris, separatus, Bombus americanorum fq, impa- 
tiens ab; Eucer.: Tetralonia dilecta 9. 
Lepidoptera (3, n)—Nymphal.: Anosia; Papilion.: Iphiclides; 
Sphing.: Deilephila. 
Strophostyles helvola (3:199).—Blooms July 7-—October 19; 
8 visitors observed, July 31—August 26; Ma, R. 
Long-tongued Bees (8)—Bomb.: Bombus americanorum 9%; 
Megachil.: Megachile brevis ¢ 9, se, fq, generosa ¢ 9, se, ab, mendica 
3 2, petulans Q, se, fq, strophostylis 9, se, fq, oligolege, type, Oligo- 
tropus ¢, Xanthosarus 9. 
Ezxtra-floral nectaries—The following 45 species were taken on 
the extra-floral nectaries, July 31-September 8: 
Ants (3, $)—Formic.: Formica fusea ab, schaufussi, Lasius. 
Short-tongued Bees (2, 2)—Halict.: Oxystoglossa confusa; 
Sphecodini: Sphecodes arvensis. 
Other Hymenoptera (23) —Sphec.: Chalybion, Sceliphron; 
Philanth.: Cerceris clypeata, finitima, kennicottii fq, Philanthus 
punctatus; Vesp.: Polistes variatus, Vespula germanica; Eumen.: 
Leionotus vagus; Ozybel.: Oxybelus 4-notatus; Trypozyl.: Try- 
poxylon frigidum; Larr.: Astatus unicolor, Tachysphex mundus; 
Nysson.: Zanysson aurinotus; Pompil.: Ageniella longula, Lopho- 
pompilus atrox; Mutill. (4): Mutilla serupea, Sphaerophthalma ; 
Chrysid.: Hedychrum parvum, Tetrachrysis venusta; Bracon.: 
Agathis vulgaris; Ichnewmon.: Diplazon, Limneria fura. 
