ἀλογομυῖα
From LSJ
τὸ γὰρ εὖ πράττειν παρὰ τὴν ἀξίαν ἀφορμὴ τοῦ κακῶς φρονεῖν τοῖς ἀνοήτοις γίγνεται → undeserved success engenders folly in unbalanced minds
English (LSJ)
ἡ, A horse-fly, Anon.in Rh. 125.10.
Spanish (DGE)
-ας, ἡ mosca de caballo, tábano Anon.in Rh.125.10.