A defendant in a criminal case raising the defense of insanity shall, at his arraignment, specially plead "not guilty and not guilty by reason of insanity."

Source: SL 1953, ch 201 , § 1; SDC Supp 1960, § 34.20A01; SDCL, § 23-37-1 ; SL 1978, ch 178 , § 124; SL 1983, ch 174 , § 8.