The inventory of the Symphyta of the department of Isère (S.E. France) contains 262 species, not including three species present in the Vercors range belonging to the department of Drôme. After a botanical description of the department, the inventory gives, for each species, its known host plants, the number and sex of the examined individuals, and the places and date — or period — of collection. The data coming from Isère are separated from those coming from northern Drôme. An analysis of this inventory puts emphasis on the species that are rare at the national level, or new for France (Blasticotoma filiceti), on the species with meridional or mountainous character, and on the species that are common in our country, but absent or rare in t...