This is one of the series of papers to put the gregarines found in Japan in order. In this paper the author wants to describe three new and ten already known species of gregarines from Japanese Orthoptera and Dictyoptera. As for the known species he rewrites the description with the system which he proposed in the previous paper. By this time 11 eugregarines have been reported from 14 Orthoptera and 1 from 2 Dictyoptera. Among the known species three gregarines, Gregarina korogi, Leidyana erratica and Leidyana suzumushi, have already been described with the proposed system so the description of these three gregarines is omitted from this paper. On the parasitism of the gregarines described in this paper some interesting facts are observed. Some of them show little severe host specificity and they parasitized different species of host. For example, Coronoepimeritus japonicus is parasitic on four different hosts and Gregarina blattarum,Gregarina inago,and Leidyana oviformis are parasitic on two different hosts. On the other hand some of the host Orthoptera are infected with two different species of gregarines in their digestive tract. Gryllus yemma and Pteronemobius taprobanensis are infected with Leidyana and Gregarina. Oxya velox and Oxya japonicus are infected with Gregarina and Coronoepimeritus. Diestrammena japonica is infected with two species of Gregarina.