Size and color discrimination of the robber fly Efferia tricella (Diptera: Asilidae) as a predator on tiger beetles (Coleoptera: Cicindelidae)

Shelly, TE.; Pearson, DL.

Environmental Entomology 76: 790-793

1978


ISSN/ISBN: 0046-225X
DOI: 10.1093/ee/7.6.790
Accession: 000747314

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Abstract
A size continuum of 8 similarly-shaped species of Cicindela with dark or orange abdomens was presented to wild females of Efferia tricella (Bromley). A significant inverse correlation between prey size and attack rate was found. In addition, medium-size Cicindela spp. (surface area of 86 mm2) with orange abdomens were attacked 13-18% less frequently than were medium-sized tiger beetles with dark abdomens. However, small tiger beetles (surface area of 53 mm2) with orange abdomens were attacked only 7% less frequently than were small tiger beetles with dark abdomens.