The defendant appeals from his conviction of possession of heroin with intent to distribute on the ground that the search of the defendant’s person and the seizure of the heroin was unlawful and that the seized evidence should have been suppressed. We transferred the case from the Appeals Court on our own motion. We reverse.

We summarize the facts as found by the judge on the motion to suppress. On August 19,1986, at about 3 p.m. , State Trooper William Johnson received a telephone call from a secretary in *180the State police office at Logan Airport. The secretary informed Johnson that William Bums, a reservations clerk with Eastern Airlines, had received an anonymous telephone call from an individual who asked that his call be connected to the police. When Bums informed the caller that the call could not be transferred, the caller told Bums that two black men had travel-led from Boston on the Eastern Air shuttle to New York City and that they would be returning on the 3 or 4 p.m. shuttle to Logan Airport. The informant told Bums that one of the men was named Donald Williams. The caller described Williams as being approximately five feet six inches tall and wearing a black baseball cap. The informant stated that one of the men was carrying a large amount of heroin in the crotch area of his pants.

Trooper Johnson, who had been involved in an investigation of drug trafficking at Logan Airport, proceeded to the Eastern Airlines terminal in the company of another trooper.1 The last two passengers to leave the 4 p.m. shuttle fit the description provided by the informant. The defendant, who was not wearing the baseball cap, had a noticeable bulge in his left crotch area. Both men moved slowly while scanning the area. In the arrival area, they met two men with whom they conversed for approximately thirty seconds. The defendant and his companion frequently looked toward one of the troopers. The defendant then left the group, walking quickly to the upper terminal without stopping in the baggage area.

Trooper Johnson followed the defendant to the upper terminal. He asked the defendant if he could speak with him. The defendant agreed. The defendant provided Johnson with his name, but he could produce no identification. The defendant did not respond when Johnson asked him about the bulge. The trooper then frisked the defendant and felt a hard object about the size of a package of cigarettes. Johnson reached into the defendant’s pants and recovered a number of glassine packages of heroin tightly wrapped in newspaper.

*181Following a jury-waived trial, the defendant was convicted and sentenced to serve two and one-half years in the Suffolk County house of correction, one year to be served, the balance suspended, with two years’ probation. The defendant timely filed a notice of appeal.

The sole issue on appeal is whether there was probable cause to support the arrest and search of the defendant’s person. See Commonwealth v. Robinson, ante 163 (1988). The judge below noted in his memorandum of decision on the motion to suppress, neither the informant’s reliability nor the basis for his knowledge was established by the informant during the course of the telephone call. Thus, to satisfy the Aguilar-Spinelli test, the details of the informant’s tip must be corroborated by the police officer’s independent observation.

Turning to the question of the informant’s reliability, we conclude that the independent police corroboration of the details of the informant’s tip was not sufficient to satisfy this prong of the Aguilar-Spinelli inquiry. To determine the adequacy of the independent police corroboration of the informant’s tip, we rely on the principles expressed in Draper v. United States, 358 U.S. 307 (1959). See Commonwealth v. Robinson, supra at 166; Commonwealth v. Bottari, 395 Mass. 777, 784 (1985); Commonwealth v. Avery, 365 Mass. 56, 63 (1974); Commonwealth v. Kane, 362 Mass. 656, 659 (1972); Commonwealth v. Stevens, 362 Mass. 24, 27-28 (1972).

In this case, the informant described only the defendant’s race. The informant also only stated that either Williams or his companion would be carrying a large amount of heroin in his crotch area; the fact that the informant could not identify which man would actually be carrying the narcotics undermines his reliability. The informant’s ability to describe in some detail the height and clothing of Spence’s companion does not cure the deficiencies in the informant’s description of the defendant. The fact that the defendant was travelling with an individual whom the informant was able to describe does not indicate anything about the reliability of the informant’s tip concerning the defendant.

*182The informant’s tip was not also adequately corroborated by the defendant’s behavior. The informant correctly stated that the defendant would not be carrying luggage and on which flight the defendant and his companion would be returning to Boston and the fact that the defendant and Williams glanced at one of the troopers may suggest criminal activity.2 3Unlike the informants in the prior cases who described both the appearance and the expected behavior of the defendants, see Robinson, supra at 166; Commonwealth v. Santana, ante 167, 171 (1988); Commonwealth v. Gonzalez, ante 172, 175 (1988); Commonwealth v. Farrow, ante 176, 178 (1988), this informant failed to describe the defendant’s appearance, with the requisite detail to satisfy the reliability prong of Aguilar-Spinelli? However, the defendant’s behavior alone will not support a finding of probable cause. Accordingly, we conclude that the independent police corroboration of the informant’s tip does not satisfy the reliability prong of Aguilar-Spinelli.4 The defendant’s conviction is reversed.

So ordered.

(dissenting). I dissent. The court today is persnickety to the point of exasperation in its demands on the police. The defendant admittedly “fit the description provided by the informant,” ante at 180, down to the bulge in the crotch area of his pants. There was sufficient independent police corroboration.