A study of the occurrence frequency of equatorial E_s (E_sq) and daytime blanketing E_s at Ibadan (dip 6°S) and Zaria (dip 3°N) in Nigeria is presented. The period of study covers the years 1958 to 1965. Experimental results from the study reveal that E_sq and blanketing E_s are different phenomena and that a high incidence of E_sq is usually accompanied by a low incidence of blanketing E_s, and vice versa. In addition, the extent of the E_sq belt in Nigeria is deduced from the relative occurrence of E_sq and nonequatorial E_s during the daytime at Ibadan.