Revision of gadfly larvae of the group Tabanus bromius (Tabanidae)

New descriptions of three species and one subspecies of larvae of T. semenovi Ols., T. regularis Jaenn., T. laetetinctus laetetinctus Beck., and T. l. sordes Bog. et Sam. as well as a key to larvae of the group T. bromius, excluding two rare species T. armenicus Szil. and T. hissaricus Bar., are given. Such characters as shape and size of chaetoid fields on thoracic and abdominal segments and the character of pattern of the caudal segment are used.