Two new offerings in environmental studies and two courses from Harvard's most popular guest lecturer are among the hundreds of listings inside the bright teal cover of the 1992-93 course guide, to be sent this week to Harvard undergraduates.

Spike Lee, whose much-ballyhooed course on African-American film drew mixed reviews from its 60 participants last year, will return this spring to teach two smaller courses.

Lee will teach a seminar in the English department on screen writing. Enrollment, a limited to 15, will be based on a writing sample. In the Afro-American Studies department, Lee will lead another course on contemporary African-American cinema. This year's enrollment will be pared to 25; as in last year's course, preference will be given to Afro-Am and Visual and Environmental Studies concentrators.

Harvard's fledgling Committee on Environmental Studies has apparently brought about the creation of two new Earth and Planetary Sciences courses, both listed as Introduction to Environmental Sciences. The first, taught by Rotch Professor of Atmospheric Science Michael B. McElroy and Burden Professor of Atmospheric and Oceanic Sciences Brian P. Farrell, focuses on the atmosphere, ocean and biosphere. The other, led by Professor of Mineralogy Charles W. Burnham, centers on the Earth.

The History Department will bring back itsAmerican history survey, History 71. But thecourse won't be taught by a junior or seniorfaculty member; Instructor Ronald Yanosky willlead its first half, while Lecturer VincentTompkins will take over second semester, beginningwith the Civil War.

New Dean of Undergraduate Education LawrenceBuell will remain busy as an graduate educator,teaching an upper-level course in AmericanLiterary Emergence as a Postcolonial Phenomenon.The scholar will also chair the Expository Writingdepartment.

After a year's hiatus from his teaching duties,Dean of the Faculty Jeremy R. Knowles will leadinga graduate research course in BioorganicChemistry.

But Chemistry 171, Molecular Enzymology, andChemistry 172, Bioorganic Chemistry--both listedunder knowles' name in last year's course catalogand bracketed until 1992-93--will not be offeredthis year, after all.

Baker Professor of Economics Martin S.Feldstein '61 will remain at the spiritual helm ofSocial Analysis 10, but Brian J. Hall will be themammoth course's new head teaching fellow