Dyscinetus morator or Euetheola humilis? - Euetheola rugiceps

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Home » Guide » Arthropods (Arthropoda) » Hexapods (Hexapoda) » Insects (Insecta) » Beetles (Coleoptera) » Polyphaga » Scarabaeoidea » Scarab Beetles (Scarabaeidae) » Rhinoceros Beetles (Dynastinae) » Pentodontini » Euetheola » Sugarcane Beetle (Euetheola rugiceps)

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Copyright © 2015 Steve Scholnick

Dyscinetus morator or Euetheola humilis? - Euetheola rugiceps

Scotland Beach, St. Mary's County, Maryland, USA
May 9, 2014

I’m uncertain whether this is Dyscinetus morator or Euetheola humilis. Unfortunately, the shape of the clypeus is somewhat obscured by sand and the BugGuide species pages don’t make it clear what the differences are supposed to be in the shape of the apical edge of the hind tibia. Arnett et al., state that the hind tibia of Euetheola is “strongly broadened to the apex” (vol. 2, page 64) but any difference in this regard between these species is too subtle for me.

Thanks for the help.

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Dyscinetus morator or Euetheola humilis? - Euetheola rugiceps

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Contributed by Steve Scholnick on 4 January, 2015 - 3:29pm
Last updated 6 January, 2015 - 8:35pm

Moved

Moved from ID Request.

… Alan Jeon, 6 January, 2015 - 8:35pm

Thanks

what characteristics did you use to decide between the 2? The more I learn the less I'll have to bother editors at BugGuide for ID help

… Steve Scholnick, 6 January, 2015 - 9:40pm

One way to tell them apart

is to look at the clypeus. D. molitor has a round, oval looking clypeus whereas E. humbles has somewhat pointy clypeus resembling isosceles trapezoid. You'll notice the difference when you compare the pics of the two.

… Alan Jeon, 6 January, 2015 - 11:24pm

thanks again

Never having seen either species before and with sand on the clypeus of this beetle, I wasn't confident I could make that call myself

… Steve Scholnick, 7 January, 2015 - 8:21am

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