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23. Transverse frontal suture straight, positioned near median ocellus (a1--sometimes shallowly V-shaped if face is collapsed), and scrobal grooves nearly parallel, close together throughout their length, and mesoscutal midlobe with 1 pair of setae (b1; the setae sometimes very tiny).

Closterocerus subgenus: Achrysocharis Girault, 1913

23'. Transverse frontal suture V-shaped (aa1). Scrobal grooves variable. Only a few Omphale (about 2 species) with 1 pair of mesoscutal midlobe setae, and they have a much different face.

couplet 24

a1

 aa1 b1
achrysface.jpg (144279 bytes)

omphale obscurinotata.JPG (15226 bytes)

 achrysmsc.jpg (73628 bytes)

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Image credits: aa1: Hansson (1996a).