CHARLES ROBERTSON 203 
Osmorrhiza longistylis (12: 452, 459-60).—Blooms April 21- 
May 23; 71 visitors observed, May 4-23; Mis, W. 
Long-tongued Bees (8)—Megachil.: Ceratosmia 9, Diceratosmia 
¢; Ceratin.: Zaodontomerus ¢'; Bomb.: Bombus impatiens 9; Ap.: 
Apis; Nomad.: Gnathias cuneatus 2, Nomada parva ¢, sayi 9. 
Short-tongued Bees (24)—Prosopid.: Prosopis illinoensis ¢, 
pygmaea ¢\, sayi ¢ 9, fq, thaspii ¢, ziziae f; Halict.: (2); Aga- 
postemon radiatus se, splendens, Augochlora viridula, Chloralietus 
caeruleus, obscurus sc, type, pilosus sc, sparsus s¢, versatus se, 
Curtisapis coriacea sc, forbesii sc, Evylaeus pectoralis se, ab, 4- 
maculatus se, ab, Halictus lerouxii, Oxystoglossa confusa ab, pura, 
Seladonia; Sphecodini: Proteraner ¢; Andren.: Andrena geranii 
g, sayi 9. 
Other Hymenoptera (4)—Eumen.: Ancistrocerus tigris, Eu- 
menes fraternus; Chrysid.: Holochrysis hilaris; Evani.: Foenus 
tarsatorius. 
Diptera (27)—Bombyli.: Aldrichia, Bombylius major; Empid.: 
Empis distans ab, humilis type, loripedis; Syrph.: Allograpta, 
Chilosia cyanescens fq, petulea, Mesogramma geminata, marginata, 
Paragus bicolor, tibialis, Pipiza femoralis, Rhingia, Sphaerophoria, 
Sphegina campanulata type, rufiventris, Syritta ab, Syrphus 
ribesii; Conop.: Myepa vesiculosa; Tachin.: Gymnosoma, Peleteria, 
Siphona fq; Anthomy.: Hylemyia inornata, Phorbia platura; Psil.: 
Chyliza; Oscin.: Siphonella oscinina. 
Lepidoptera (2)—Papilion.: Eurymus; Hesperi.: Thanaos 
martialis. 
Coleoptera (5)—Bruch.: Bruchus minus; Mordell.: Mordel- 
listena biplagiata; Anthic.: Corphyra terminalis; Curculion.: 
Idiostethus subealvus, tubulatus. 
Hemiptera (1)—Caps.: Lygus. 
Oxypolis rigidior (12: 459-60).—Blooms July 31-September 
8; 157 visitors observed, August 14-September 8; Pol, W. 
Long-tongued Bees (1)—Ap.: Apis. 
Short-tongued Bees (6)—Prosopid. (ff 2): Prosopis pygmaea, 
ziziae ; Halict.: Chloralictus sparsus 2, sc, versatus ¢ 9, se, Halietus 
lerouxii 2; Sphecodini: Sphecodes arvensis ¢. 
Other Hymenoptera (73)—Crabron.: Lindenius errans, Sol- 
enius, Xestocrabro texanus, trifasciatus; Ozybel.: Notoglossa 
americana, frontalis, Oxybelus packardii, 4-notatus; Philanth.: 
Cerceris clypeata, compacta; Sphec.: Chalybion fq, Chlorion, Iso- 
dontia apicalis, Priononyx atrata, Sceliphron; Lerr.: Astatus uni- 
color, Larropis, Lyroda, Tachysphex belfragei, Tachytes elongatus; 
