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- [49] STUDY ON FIRST STAGES OF CHIRONOMIDAE FROM CHAD (INSECTA, DIPTERA) .5. DESCRIPTION OF CHIRONOMUS (CRYPTOCHIRONOMUS) DERIBAE FREEMAN, 1957, AND POLYPEDILUM (POLYPEDILUM) FUSCIPIENNE KIEFFER, 1921 CAHIERS ORSTOM HYDROBIOLOGIE, 1971, 5 (02): : 87 - &