I had to click on a few different tomes of the Acta Sanctorum to find my saint, but I eventually located Vitus in tomes 2. His feast day is June 15, which was the last day in tome 2. He was all the way down on page 1013 of the document, page 1135 on the link. He is accompanied in the Acta Sanctorum by Modestus and Crescentia, his tutor and nurse, respectively, as indicated by the header: De SS. Vito, Modesto, Crescentia, MM.
Outline of the Acta Sanctorum on St. Vitus
De Sanctis Martyribus Siculis, Vito, Modesto, Crescentia, iisdemque vel aliis vito et modestto. Romae passis et cis atque trans alpescultis. Commentarius prævius.
I. Nomina sacris sastis inscripta; Aeta ætatis variæ, fidei non magnae; cultus & Reliquiæ in Sicilia.
II. Cultus & Reliquiæ S. Viti & fociorum in Italia. Historia translatorum in Apuliam eoporum.
III. Reliquiæ & Cultus S. Viti in Provinciis Transalpinis
PASSIO S. VITI
Seculo vi vel vii composita, & Romæ inventa seculo viii. Ex variis Codicibus Mss. Admonitio prævia D.P.
Pars 1. A S. Vito aeta & tolerata in Sicilia, sub patre Hyla & Praeside Valeriano.
Annotata D.P.
Pars II. Transitus in Lucaniam, inde romam. Varia panæ inflictæ. Obitus. Sepultra.
Annotata D.P.
D.P. Disquisitio Conjecturalis. De Prima sepultra S. Viti, & prætensa Translatione corporis ex Lucania in Apuliam.
Translatio S. Viti
Roma in Franciam & inde in Cotbejam Saxonicam: Auctoribus eorumden locorum Monachis duobus. Ex Mss. Gladbacensi & Bodecensi.
Prologus.
Caput I. Reliquiæ S. Viti in Franciam translatæ, & pro novæ Corbiæ in Saxonia structo monasterio, petitæ atque impetratæ.
Annotata G.H. ET D.P.
Caput II. Translatio S. Viti ad Corbejam-novam miracula per iter.
Annotata G.H. & D.P.
Translatio S. Viti
Ex Italia in Bohemiam sub Carolo IV.
I. Litterae de ea re Imperiales, & quæstio habita de corpore, quod Senis esse dicebatur, est autem S. Guidonis alicujus.
L.S. Per Dominum Regem. Nicolaus de Chremschiz.
II. Analeeta de Gloria Ecclesiæ S. Viti Pragæ.
The Cult of Reagan 