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Leaf Beetle - Lema trivittata - male - female

Leaf Beetle - Lema trivittata - Male Female
Spiderweb, Aiken County, South Carolina, USA
May 10, 2011
Size: ~4mm Male - ~6mm Female
Found this morning on a Brugmansia suaveolens leaf.

Either Lema trivittata or Lema daturaphila.

Images of this individual: tag all
Leaf Beetle - Lema trivittata - male - female Leaf Beetle - Lema trivittata - male - female

probably Lema trivittata --det. S.M. Clark
Moved from Lema.

Vassili asked me to look into these. I've tried to key them out using Ciegler's 2007 treatment of the chrysomelids of SC. The key characters in that book are exclusively color patterns.

The color on the head (esp. around the eyes) and apparent width of sublateral black maculae on elytra point to L. daturaphila.

The lack of pronotal maculae tends to support(?) L. trivittata. However, apparently, most L. trivittata have black around the margins of the eyes, something these specimens do not.

If I had to chose, I'd guess these are L. daturaphila that happen to lack black maculae on the pronotum (not sure how reliable this feature is). Looking among other pics on BugGuide, I think both species have few to several images in the wrong place.

thanks, Blaine; very thorough
so you corroborate my suspicion about the mess on the two sp. pages... i'll try to involve the chrysomelid gurus and sort it out

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