Chemical composition of haemolymph in the larvae of the dragonfly Orthetrum chrysis (Selys) (Anisoptera: Libellulidae)

A quantitative analysis of the chemical composition of the haemolymph is provided. Sodium and chloride appear to be the major electrolytes primarily responsible for maintaining the osmotic balance. Besides a high concentration of trehalose, haemolymph also contains glucose and glycogen in low concentration. Neutral lipids, phospholipids and cholesterol are present in varying amounts. A high concentration of proteins and a low concentration of inorganic phosphorus seem to be peculiar features of the haemolymph of dragonfly larvae.