CHARLES ROBERTSON 209 
Oxystoglossa confusa; Prosopid.: Prosopis pygmaea ¢, saniculae 
3; type, sayi g', ziziae 9; Andren.: Opandrena cressonii 2, se, per- 
sonata <j, ziziae 9, sc, Trachandrena rugosa 9, se. 
Other Hymenoptera (3)—Kumen.: Ancistrocerus tigris Sym- 
morphus debilis, Bracon.: Bracon ashmeadi type. 
Diptera (12)—Mycetophil.: Sciara atrata; Empid.: Brachy- 
stoma robertsonii type, Empis distans, nuda; Syrph.: Mesogramma 
geminata, marginata; Tachin.: Siphona; Musc.: Myospila; An- 
thomy.: Homalomyia prostrata; Sapromyz.: Sapromyza longipen- 
nis; Heteroneur.: Clusia; Oscin.: Siphonella oscinina. 
Hemiptera (2)—Corimelaen.: Corimelaena pulicaria; Caps.: 
Lopidea. 
Sium cicutaefolium (12: 459-60).—Blooms July 19-—Septem- 
ber 7; 220 visitors observed, July 20-September 1; Pol, W. 
Long-tongued Bees (4)—Bomb. (9, ¢) : Bombus americanorum, 
impatiens; Ap.: Apis; Eucer.: Melissodes agilis ¢. 
Short-tongued Bees (17)—Prosopid.: Prosopis pygmaea ¢, 
sayi Q, ziziae 2; Collet.: Colletes americanus ¢, eulophi ¢; Halict.: 
Chloralictus illinoensis ¢ 9, sparsus ?, versatus ¢ 9, se, zephyrus 
3 9, Curtisapis coriacea ¢ 9, Evylaeus arcuatus 4, truncatus 9, 
Halictus lerouxii ¢, Odontalictus ?, Seladonia 2; Sphecodini: Mach- 
aeris stygia ¢ 9, fq, type, Sphecodes arvensis ¢. 
Other Hymenoptera (97)—Crabron.: Clytochrysus fq, Ectem- 
nius fq, Lindenius errans fq, Solenius, Xestocrabro 6-maculatus, 
trifasciatus; Oxybel.: Notoglossa americana fq, emarginata, fron- 
talis fq, Oxybelus niger type, packardii, 4-notatus fq; Trypozryl.: 
Trypoxylon clavatum ; Philanth.: Cerceris bicornuta, clypeata, echo, 
finitima, kennicottii, prominens, Philanthus punctatus; Sphec.: 
Chalybion, Chlorion, Isodontia apicalis, Priononyx thomae, Seeli- 
phron, Sphex gracilis, vulgaris; Larr.:; Larropsis, Lyroda, Noto- 
gonidea fq, Tachysphex terminatus, Tachytes elongatus; Bembic.: 
Megastizus; Nysson.: Hoplisoides, Nysson plagiatus, Zanysson 
plesia, Pseudoplisus phaleratus; Pompil.: Ageniella accepta, 
longula, Ceropales fraterna, Episyron, Lophopompilus atrox, phil- 
adelphicus, Pompiloides marginatus, subviolaceus, Psammochares 
relativus, tenebrosus; Vesp.: Polistes pallipes, variatus, Vespula 
germanica; Eumen.: Ancistrocerus campestris, tigris, Eumenes 
fraternus, Leionotus foraminatus, scrophulariae, ziziae, Monobia; 
Scoli.: Elis interrupta, 5-cinecta, Scolia bicincta; Tiphi.: Tiphia 
punctata ; Bethyl.: Goniozus; Thynn.: Methoca; Myrmos.: Myrmosa 
parvula type; Mutill.: Sphaerophthalma ¢; Chrysid.: Holochrysis 
verticalis, Holopyga, Tetrachrysis caerulans; Figit.: Eucoila mel- 
