Dr. Steinmann Henrik szerk.: Folia Entomologica Hungarica 23/1-12. (Budapest, 1970)

constitute a mandibular ganglion in certain types. The main nerve trunk generally divides in the neighbourhood of the mandible and innervates the musculus tentorio-mandibularis on the one hand and terminates in the mandible or emits a thick trunk to the muscles of the musculus abductor (m - 14) on the other. This trunk contains also the anastomotic nerve of the nervus labralis and the nervus lateromandibularis, as well as the sensory nerves of the nervus lateromandibularis and the nervus mandibularis abductor. Regio maxillaris (Figs. 3-4) The upper plane of section of the second infraoesophageal region can be drawn between the basal joint of the maxilla and the lower surface of the mandible. The plane extends between the lines of the maxilla and the mandible on both sides posteriorad to the occiput. The inferior plane of section is largely parallel with the superior one, between the maxilla and the lower labrum. This region contains the second main nerve trunk of the ganglion infraoesophageum, namely the nervus maxillaris. The typical muscles of the maxilla are well clarified, as visible also in Fig. 3. Eleven muscles can be called typical, namely : m 15: musculus abductor cardinalis m 16: musculus adductor cardinalis m 17: musculus tentorio-stipialis m 18: musculus cranio-lacinialis m 19: musculus stipito-lacinialis m 20: musculus abductor palpi maxillaris m 21: musculus adductor palpi maxillaris m 22: musculus stipito-galealis m 23: musculus palpi maxillaris medialis m 24: musculus palpi maxillaris ventralis m 25: musculus palpi maxillaris dorsalis.