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

(Owing to functional causes, I separate the- sympathetic nervous system into a distinct chapter and discuss it /as an „eighth region"/ together with the cephalic section of the alimentary canal subsequent to the description of the regions listed above). Regio verticalis The first cerebral region comprises the vertex from the occiput to the forehead, including the ocelli and the compound eyes. Laterally, its borders extend to the upper margin of the genae, while its intero-inferior limits coincide with the confines of the proto- and deuterocerebrum. The first cerebral region may also be named the protocerebral region since it harbors in its anterior section the most important nerve portion,the protocerebrum.In a function (a direct proportion) of the surface size of the eyes, the protocerebrum carries the paired optical lobes, supplying the compound eyes with nerves. The so-called protocerebral groove is well observable on the surface of the protocerebrum in an anterior view;its depth and the angle subtended by its margins is easily measurable and most suitable for comparative purposes and the distinguishing and separation of mainly smaller taxonomic categories. The compound eyes are of decisive importance with respect to the shape of the insect head. From the eyeless

,blind animals to the dragonflies with enormous eyes, all transitions occur in this group. Concerning the function of the muscles situated in the regio verticalis, they will be discussed in other regions. Regio antennalis (Figs. 1-2) The second cerebral region includes the antennae and their neighbourhood. Its upper plane of section lies between the vertex and the frons

;laterally it is bordered by the supragenal