CREATE TABLE table_39977 ("Species" TEXT, "Indole" TEXT, "Methyl Red" TEXT, "Voges-Proskauer" TEXT, "Citrate" TEXT)

Which species has a Voges-Proskauer reading of negative and an indole reading of negative?
SELECT "Species" FROM table_39977 WHERE "Voges-Proskauer" = 'negative' AND "Indole" = 'negative'
SELECT "Species" FROM "table_39977" WHERE "Indole" = 'negative' AND "Voges-Proskauer" = 'negative'