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

portions and posteriorly by the occiput, sectioned between the proto- and deuterocerebrum. Its inferior plane of section runs along the clypeus, the labrum, and the subantennal line of the genae on both sides

,posteriorad to the occiput.Therefore the regio antennalis contains the deuterocerebrum and its main nerves. The second cerebral region might be called also the deuterocerebral region. Its main role is the innervation of the antennae. It is paired in the majority of insects, constituting a main nerve trunk each (nervus antennalis). The nervus tegumentalis may concur with the nervus antennalis for a longer or shorter stretch, but it may also be absent. In exceptional cases the nervus tegumentalis is not aligned with the nervus antennalis, decurrent - below it and beside the oesophagus in the tritocerebral groove to behind the cerebrum. Pig. 2 displays a schematic arrangement of the nervus antennalis and the nerves of the deuterocerebral ganglion in the typical insect. As well here as in the followings, I desisted from naming the motoric nerves in the Figures, and defined them rather by a numerical symbol („n-nr"

) according to the innervated muscle; e.g. the nerve of muscle „m-12

n is designated as „n-12

w (the reference index will be published only at the end of the present series of papers). The names of the sensory nerves are given in "toto in the Figures. Six of the antennái nerves may be called typical; they make possible every sort of antennái movement and are able to execute also extremely fine - tactile - movements in many representatives of insects. Figure 1 shows the muscular system of the typical insect antenna: m - 1: musculus tentorio-scapalis anterior m - 2: musculus tentorio-scapalis posterior m - 3: musculus tentorio-scapalis medialis m - 4: musculus tentorio-scapalis lateralis m - 5: musculus scapo-pedicellaris lateralis m - 6: musculus scapo-pedicellaris medialis