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The pomegranate fruit borer, Deudorix isocrates (Fab.) is a serious pest of pomegranate causing remarkable economic loss and reported from most of the pomegranate growing countries. The research work on this pest has been undertaken on its bio ecological aspects and management. There are the least reports available on its morphological studies. This is the first study has been done on morphological details of the thoracic region of the sequential larval instars. The description is based on detailed light microscopic study of cuticular features, spiracles and appendages. This study is important to understand identification marks of larval instars, larval metamorphosis and taxonomic features. With increase in size the larval instars show peculiar morphological changes in the prothoracic shield and prothoracic spiracles as identification mark of each larval instar and found important to understand development of respiratory organs. The microscopic studies on thoracic appendages revealed general lepidopterist type. Results add to our knowledge of thoracic metamorphosis during larval period and provide a standard for further research on the morphological characters of Deudorix isocrates (Fab.).
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