The San Blas Jay lives along Mexico's southwestern Pacific coast and uses dry woodland and scrub. A study near Acapulco recorded year-round groups in the southern population.
Adults have a black head and underparts with purplish-blue upperparts and yellow eyes. Young birds are duller, with brown eyes and a yellow bill.
A study of the southern subspecies sanblasianus near Acapulco found resident groups of 13–26 birds. Helpers assisted at nests, and some nests were in coconut palms.
An extinction-risk assessment has not been added yet.