The major part of the fat body is built up of cells called trophocytes In the young animal the trophocyte is small, comparatively clear and with large, rounded nucleus. In due course, the cell develops cytoplasmic vacuoles and becomes enlarged due to deposits of or granules in the of plasm and these sites are described to be definite organelles concerned with synthesis ipids in Anthremus. Droplets of the enzyme lipase are associated with each droplet of fat