Lewis & Short

auspĭcālis, e, adj. [auspicor], of or pertaining to divination, suitable for auguries, auspicial: pisciculus, Plin. 32, 1, 1, § 4: dies, Mamert. Pan. Maxim. 6.
* Adv.: auspĭ-cālĭter = auspicato, with the appropriate taking of auguries: ponere gromam, Hyg. Limit. Constit. p. 153 Goes.