Willie James, Jr. was indicted in two counts for distributing and possessing with intent to distribute heroin in violation of 21 U.S.C. § 841(a)(1).1 The two counts arose from transactions between the appellant and a government informer, Sam Battles, on October 16 and October 27, 1972. A jury found James guilty under both counts, and we affirm those convictions.
Because Battles was dead at the time of trial,2 the government’s case against James rested largely on the testimony of George J. Cazenavette, a special agent of the Bureau of Narcotics and Dangerous Drugs. Through Battles, Cazenavette arranged via telephone the heroin purchases which underlie this prosecution, and acting under cover, he was present when the sales occurred. He testified in detail concerning both transactions, and this testimony was corroborated in significant particulars by the testimony of other law enforcement officials. The evidence is more than adequate to support the jury’s decision.
The only significant issue on appeal3 arises from the admission into evidence of two tape recordings, made when Battles talked to appellant on the telephone to set up the transactions. The most troublesome problem is the United States Attorney’s failure to disclose the existence of the tapes at the Omnibus Hearing held on April 18, 1972. There is no question that under this circuit’s interpretation of Rule 16(a)(1)4 James was entitled to discov*436ery of the tapes. Davis v. United States, 413 F.2d 1226, 1231 (5th Cir., 1969); accord United States v. Bryant, 142 U.S.App.D.C. 132, 439 F.2d 642 (1971); United States v. Isa, 413 F.2d 244 (7th Cir., 1969). That the U. S. Attorney was unaware of the tapes at the time of the hearing because they were in the possession of Agent Cazenavette does not excuse his affirmative misrepresentation.5
Moreover, “[r]ule 16(g) imposes a continuing obligation on a party who already complied with a discovery order. If at any later time, prior to or at the trial, he finds additional material previously requested and ordered that is subject to discovery under the rule, he must promptly notify the other party or his attorney or the court of the existence of the additional material.” 1 C. Wright, Federal Practice & Procedure, § 259, at 532 (1969). Thus, when government counsel received the case file from the B. N. D. D. office in Washington at least two weeks prior to trial and thereby learned of the tape recordings, he should have notified appellant’s attorney or the court, and his failure to do so is inexcusable. We fully agree with the observation in United States v. Baum, 482 F.2d 1325, 1331 (2nd Cir., 1973), that “[o]rdinarily it is disclosure, rather than suppression, that promotes the proper administration of criminal justice.” In addition to helping expedite the trial of criminal cases, an omnibus hearing facilitates discovery thus reducing, in the spirit of the criminal discovery rules, the opportunity for trial by ambush. This salutary function cannot be aborted by allowing a United States Attorney to avoid discovery by pleading ignorance of discoverable material which is in the possession of another governmental agency; especially is this true when both are supposedly working together to apprehend and convict those engaged in the distribution of illegal drugs.
Our distaste for the government’s conduct does not, however, warrant a reversal of the case at bar.6 We have previously held that “an error in administering the discovery rules is not reversible absent a showing that the error was prejudicial to the substantial rights of the defendant.” United States v. Saitta, 443 F.2d 830, 831 (5th Cir., 1971), cert. den., 404 U.S. 938, 92 S.Ct. 269, 30 L.Ed.2d 250; United States v. DeSimone, 452 F.2d 554, 557 (5th Cir., 1971); accord United States v. Dowdy, 455 F.2d 1253, 1255 (10th Cir., 1972); United States v. Cole, 453 F.2d 902, 904 (8th Cir., 1972); United States v. Allsenberrie, 424 F.2d 1209, 1215 (7th Cir., 1970). See also Pierce v. United States, 414 F.2d 163, 169 (5th Cir., 1969), cert. den., 396 U.S. 960, 90 S.Ct. 435, 24 L.Ed.2d 425. A thorough review of the record in this case leaves us convinced that the prejudice, if any, flowing from the government’s failure to produce the tapes until the time of trial was insubstantial.
Defense counsel was informed immediately prior to trial about the tapes and the government’s intent to use them in its case in chief. A recess was then granted in order for both the court and the defense to consider the applicable law. Subsequently, a hearing was held outside the jury’s presence for the gov-*437eminent to establish the foundation for admitting the tapes into evidence. Once the court was satisfied as to the admissibility of the tapes, that they were authentic and that Battles had consented to have his conversations with James recorded,7 the trial proceeded. Defense counsel continued to object to admissibility on these grounds, but he did not argue that he was unprepared to meet the evidence contained in the tapes. See United States v. Kelly, 420 F.2d 26, 29 (2nd Cir., 1969). Nor did counsel seek either a longer recess or a continuance, see United States v. Avila, 443 F.2d 792, 795 (5th Cir., 1971), and he acquiesced in the continuation of the trial. And finally, the court was not asked pursuant to Rule 16(g) to refrain from admitting the tapes as a sanction for the government’s failure to comply with the discovery rules. See United States v. Good, 410 F.2d 1217 (5th Cir., 1969), cert. den., 397 U.S. 1002, 90 S.Ct. 1131, 25 L.Ed.2d 413.
In conclusion the record fails to disclose the type of prejudice that would require our granting appellant a new trial. Compare United States v. Baum, 482 F.2d 1325, 1331 (2nd Cir., 1973); United States v. Kelly, supra, 420 F.2d at 29; United States v. Miller, 411 F.2d 825, 832 (2nd Cir., 1969); United States v. Padrone, 406 F.2d 560, 561 (2nd Cir., 1969). Considering the damaging character of the tapes, counsel did an admirable job of countering this evidence during cross-examination of Agent Cazenavette. And, although the contents of the tapes bolstered by corroboration the agent’s previous testimony, they did not contain facts not previously revealed. See United States v. Miller, supra. It is therefore unnecessary to afford James a new trial for the purpose of giving him a fair opportunity to respond to this evidence. See United States v. Kelly, supra. Reiterating, we hold only that in the particular circumstances of this case the government’s failure to comply with the discovery rules until the time of trial does not amount to reversible error.
Affirmed.