Dr. Papp Jenő szerk.: Folia Entomologica Hungarica 24/1-23. (Budapest, 1971)

ROVARTANI KÖZLEMÉNYEK (SERIES NOVA) TOM. XXIV. 1971. Nr. 18. A Comparative Anatomy of the Insect Head. III. Muscles and Nerves of the Regio labialis and R. cervicalis By Dr. H. Steinmann Hungarian Natural History Museum, Budapest Regio labialis (Pigs.

1-2) The third infraoesophageal region comprises the lower portion of the head. Its upper plane of section borders on the regio maxillaris, the lower one is the inferior surface of the head itself.The inferio—posterior part (that is, towards the cervix) of the region may be drawn the third (nervus labialis) and fourth (n. cervicalis) nerve trunks of the ganglion infraoesophageum. The main nerve trunk, the nervus labialis, of the labial region arises on the inferior (ventral) surface of the ganglion infraoesophageum, between the main nerve trunks n. maxillaris and n. cervicalis. It serves a twofold purpose: the innervation of mostly the parts of the labium and the innervation of the salivary gland

(

s

).Among the nerves of the salivary gland in insects there occur also sympathetic nerve branches,but in the majority of insects the muscular action, caused by the motoric movement of the oral organs, effectuate mechanically the functioning of Ä

Parts I. and II. of the series have been published as papers Nr.

3« and 8 in volume XXIII of this journal. Fol. Eut. Hung., XXIV. 1971. -211