Extremely Crass and Noisy: Gryllus for Monster Monday

The Gryllus is an interesting case for my Monstrous Monday Monster. I statted him up on a piece of typing paper in high-school, having seen him lurking under the furniture and around the bend in more than one Hieronymus Bosch painting (statuettes for sale at the EMuseum Store):

My Spanish book on Bosch identified this kind of creature as a Gryllus, etymology unknown - is it from the Latin for "cricket" or a reference to the crewman of the Odyssey who begged Circe not to change him back from pig to man? Anyway, the Gryllus appears all over in medieval iconography, whenever a manuscript-doodling monk or a cathedral carver got tired of doing torsos:

No-body on the right, no-head on the left.

And okay I'm going to let my 16 year old self take care of the rest of this post, vomit lakes, ordure bogs and all. Stats in parentheses are for the "Bakarout" sub-variety. I think these guys were meant to be the manes/larva equivalent for Tarterus. Ka-scan!

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As a bonus, here's a partially revised version of the gryllus, with improved (?) color illustrations, new stats, and a spiffy two-column layout - forecasting 2nd edition D&D in 1983! - that I never got around to finishing.

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And how would I stat them today, stripped down for generic Old School games?

Knight Gryllus: HD 3, AC 3 [16], MV 6, atk: bite d3 (wounds only heal from rest), spiked headbutt d6; def: non-magical weapons do half damage round down, mind: low, size: 0 (small), xp: 3 HD + 2 minor abilities.
(Visor down: AC 1 [18] but no bite)

Mage/Monk Gryllus: HD 2+2, AC 6 [13], MV 3, atk: bite d3 (wounds only heal from rest), spells as 4th level wizard/cleric, def: non-magical weapons do half damage round down, mind: high, size: 0 (small), xp: 2+2 hd + 1 major and 2 minor abilities.