1981] 
Tepedino & Parker — Flower-Visiting Insects 
327 
tion was accomplished without landing and the cue was probably 
scent of nectar (Heinrich 1979). Future field studies should explore 
the use of these more subtle cues by foraging insects. 
Acknowledgments 
We thank Drs. Ivan Palmbad and Richard Rust for reviewing the 
manuscript. 
Appendix 
Insect taxa visiting sunflower and onion plantings. 
Sunflowers 
Hymenoptera: 
Bees — Andrenidae [ Andrena helianthi Robert- 
son, Perdita sp., Pseudopanurgus sp., Ptero- 
sarus sp.]; Anthophoridae [Melissodes agilis 
Cresson, Svastra obligua (Say), Triepeolus heli- 
anthi (Robertson)]; Apidae [ Apis mellifera Lin- 
naeus, Bombus spp.]; Halictidae [Agapostemon 
sp., Dialictus sp., Halictus farinosus Smith, 
Halictus ligatus Say]; Megachilidae [Megachile 
paralella Smith, Megachile pugnata Say]. 
Diptera: 
Lepidoptera: 
Syrphidae 
Hesperiidae 
Onions 
Hymenoptera: 
Bees — Apidae [Bombus sp.]; Halictidae [Evy- 
laeus sp, Halictus farinosus Smith, Halictus 
ligatus Say]; Megachilidae [Hoplitis fulgida 
(Cresson), Megachile pacifica (Panzer), Mega- 
chile sp.]. 
Wasps — Eumenidae [Euodynerus sp., Ptero- 
cheilus sp.]; Ichneumonidae; Sphecidae [Am- 
mophila sp., Astata sp., Cerceris sp., Philanthus 
sp., Podalonia sp., Sphex sp., Tachytes sp.] 
Diptera: 
Muscidae; Nemestrinidae; Sarcophagidae; Syr- 
phidae; Tachinidae. 
Lepidoptera: 
Hesperiidae 
