By means of morphometric parameters of amastigote stage and the type of development in a susceptible sandfly, four isolates of the so called Leishmania mexicanapifanoi are compared with one of L. mexicana mexicana and other of L. braziliensis. The results indicate that those isolates from diffuse chronic cutaneous lesions show a very close similarity with L. mexicana mexicana and suggest that the name L. mexicana pifanoi seems no to be tenable. These isolates may belong instead to L. mexicana amazonensis.