Thorax: the wings hyaline and splendidly iridescent, the tegulae and the tarsi rufo-testaceous.
"Journal of the Proceedings of the Linnean Society - Vol. 3" by Various
Aileron: the scale covering the base of primaries in some insects; see tegulae in Diptera = alula and squama, q.v.
"Explanation of Terms Used in Entomology" by John. B. Smith
On the misuse of the terms parapteron, hypopteron, tegula, squamula, patagium and scapula.
"Handbook of Medical Entomology" by William Albert Riley
The pronotum reaches back to the tegulae.
"Encyclopaedia Britannica, 11th Edition, Volume 14, Slice 2" by Various