Myrmecophilus (Myrmecophilus) acervorum (Panzer, 1799)
 
habitus, antenna, ovipositor, and hind leg

Source: Saussure. 1877. Mem. Soc. Phys. Hist. Nat. Geneve 25(1):169-504 [1-352], Pl. 15, Fig. 26