1890 Proscutum, the scutum of the pronotum; the scutal sclerite of the prothorax.
1913 39 191 Catalogue of Lettering of Plates... P, pothorax. P1, proscutum. P2, proscutellum. P3, pronotal lobe.
1938 64 295 The antesutural portion of the mesonotum is the proscutum.