Larvae and puparia of two agromyzid stem-borers, Melanagromyza heracleana Zlobin and M. limata Spencer, collected from an endemic plant, Heracleum platytaenium Boiss. (Apiaceae), in Bolu Province, Turkey, are described and illustrated by original drawings for the first time. M. limata is recorded from Turkey for the first time and its male genitalia are noted in detail. Also, H. platytaenium is recorded as a new host plant for M. limata.