As targets of the fourth photometry campaign of the STEPHI network, the Delta Scuti stars BNCnc (HD73576) and BUCnc (HD73763) were simultaneously monitored during a three-week, three-continental run, in February 1992 (Belmonte et al 1994). Both stars are members of the Praesepe cluster. The ''constant'' star HD73712 (KW284) was chosen as comparison star, and no variability appeared, neither during the preliminary tests, nor during the STEPHI campaign.