Three new species of the genus Favognathus Luxton, 1973 are described from Iran, namely Favognathus esfahaniensis sp. nov., collected from soil under lichen at Najaf Abad, Esfahan Province; Favognathus alvandii sp. nov., from soil under plum, hawthorn and quince trees at Hamedan, Hamedan Province; and Favognathus guilanicus sp. nov., from soil under an unknown plant at Rasht, Guilan Province. The female and male of the type species Cryptognathus lagena Kramer, 1879 are re-described. Cryptognathus sternalis Krantz, 1958 is removed from synonymy with C. lagena after examination of the ornamentation and leg setation of type specimens, because trochanter I has 1 seta and tarsi I–IV 15(1ω)–12(1 ω)–9(1ω)–9 (1ω) in C. lagena instead of trochanter I nude and tarsi I–IV 15(2ω)–12(2 ω)–10(1 ω)–10(1ω) in C. sternalis.
