Thoron, Haliday. Six, 1833

JOHNSON, NORMAN F. & MASNER, LUBOMIR, 2004, The Genus Thoron Haliday (Hymenoptera: Scelionidae), Egg-Parasitoids of Waterscorpions (Hemiptera: Nepidae), with Key to World Species, American Museum Novitates 3452, pp. 1-16 : 5-6

KEY TO WORLD SPECIES OF THORON

Females (Unknown for T. spinifer )

1. Mesoscutum and scutellum with regularly spaced, deep, thimblelike, setigerous punctures; notaulus reduced to short, isolated furrow in anterior third of mesoscutum and absent near transscutal articulation (fig. 15); Indonesia (Seram)... T. dayi , n.sp.

– Mesoscutum and scutellum at most with minute setigerous punctures; notaulus clearly present posteriorly near transscutal articulation, often very long (figs. 3, 16–18)... ................................. 2

2. Apex of A1 distinctly extending above top of head (lateral view with A 1 in flexed position (fig. 8)...................... 3

– Apex of A1 at same level as top of head (lateral view with A 1 in flexed position, fig. 2) ................................ 4

3. Mesoscutum with only long semidecumbent bristles and no micropilosity; notaulus short, not extending anteriorly to level of posterior margin of tegula, simple, without crenulae (fig. 18); Bolivia.. T. rex , n.sp.

– Mesoscutum with both long bristles and shorter underlying pilosity; notaulus long, extending anteriorly beyond level of posterior margin of tegula, deeply crenulate (fig. 16); USA (Arizona)................... T. longicornis Masner and Huggert

4. Metapleuron and lateral face of propodeum uniformly covered with long, silvery hairs (figs. 2, 11); postmarginal vein extremely