¶1The defendant was convicted of the armed robberies
¶21. The defendant’s argument asserting a violation of G. L. c. 231, § 81, is frivolous. The judge’s charge on the question of identification was based almost entirely on the model instructions recommended for the subject set forth in the appendix to the decision in Commonwealth v. Rodriguez, 378 Mass. 296, 308 (1979). The portion of the instructions to which the defendant objects is a virtually verbatim expression of the ninth paragraph of the exemplar.
¶32. At the hearing on the motion for new trial, Eric Colon, who had previously entered pleas of guilty to the robberies, testified that one Angel Gonzalez, and not the defendant, was his confederate in the commission of the crimes. At the conclusion of his direct testimony, Colon stated that he would be willing to take a polygraph examination in support of his testimony. During argument on the merits of the motion, the judge indicated that he disbelieved Colon, that *547he intended to deny the motion, and that the results of a favorable polygraph test, if the witness chose to take one, could be submitted with a request for reconsideration of the ruling. The judge orally stated that he was not “making [the] ruling contingent on the resultfs] of the lie detector test.” The motion was denied on the same day and bore the judge’s written observation that he did not believe Colon’s testimony, together with the additional statement that “the Court . . . does not set out any obligation for the witness to take a polygraph test; however, if further evidence along that line is introduced . . . such evidence may be considered on motion to reconsider the denial of this motion.” The defendant, relying on the circumstances that prevailed in Commonwealth v. Howard, 367 Mass. 569 (1975), now argues that the judge’s commentary on the offer of polygraph evidence indicated a willingness on his part to substitute the results of a polygraph examination for his own independent judgment and constituted an abdication of his responsibility to make the decision.
¶4There is no meaningful comparison between this case and the events discussed in the Howarddecision. Unlike that case, the matter of a polygraph was raised by defense counsel and not on the judge’s own initiative. Nor did the judge ever unequivocally state (as was the situation in Howard) that the test results would totally control the outcome of the proceedings. In the present case, the judge made it abundantly clear, both orally and in writing, that his decision on the motion was predicated on his rejection of Colon’s testimony and that his ruling was not contingent upon the receipt of polygraph evidence. There is ample support in the record for the judge’s disbelief of the newly discovered evidence. We see nothing in the proceedings which “cast[s] a shadow on the judicial process” (Howard at 571), or which conveys an appearance of unfairness in the disposition of the request for a new trial.
¶5The balance of the defendant’s arguments do not otherwise reveal an abuse of discretion in the denial of the motion *548and need not be separately discussed. See Commonwealth v. Brown, 378 Mass. 165, 172 (1979), and cases cited.
¶6Judgments affirmed.
¶7Order denying motion for new trial affirmed.
¶8 The defendant was charged on two indictments for armed robbery while masked or disguised (G. L. c. 265, § 17), on the basis that he wore a hooded sweatshirt. The jury acquitted him of so much of the indictments as alleged that he was “masked or disguised ... [or had] his features otherwise artificially distorted.”
¶9 The fairness of the displays has not been questioned.
¶10 The other victim was unable to make any identification and did not testify at the trial.
¶11 “The courts shall not charge juries with respect to matters of fact, but they may state the testimony and the law.” We assume that the provisions of this statute are applicable to criminal proceedings. See discussion on this point in Commonwealth v. Ramey, 368 Mass. 109, 113 n.4 (1975).
¶12 “You may also take into account that an identification made by picking the defendant out of a group of similar individuals is generally more reliable than one which results from the presentation of the defendant alone to the witness.”