Haemolymph is the circulatory fluid of various invertebrate animals that is functionally comparable to the blood of vertebrates that contain organic and inorganic components in addition to cellular element termed haemocytes. Present study revealed that five types of haemocytes in the haemolymph of eri silkworm Samia cynthia ricini were found viz., prohaemocytes, plasmatocytes, granulocytes, oenocytes and spherulocytes. Morphological features say that prohaemocyte are small cells with large nucleus. Spherulocyte includes cytoplasm with vacuoles and are observed least in the haemolymph of eri silkworm. Plasmatocyte show polymorphism and have large nucleus and are among the most abundant types. Whereas granulocytes are seen to be compact cell with small nucleus. Oenocytes are small cell with elongated nucleus. In term of total haemocyte count, maximum haemocytes count was found to be (2156 cells mm3) in 5th instar castor (Ricinus communis) fed larvae compared to tapioca (Manihot esculenta) fed larvae (1470 cells mm3).