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

the several palpal joints, while the whole of the palpus is moved by the musculus adductor and abductor, respectively, whose nerves are defined as n - 33 and n - 35 Pig. 1. Twelve labial muscles may be called typical, namely: m 26: musculus postmento-praementalis m 27: musculus tentorio-praementalis lateralis m 28: musculus tentorio-praementalis dorsalis m 29: musculus tentorio-praementalis medialis m 30: musculus tentorio-praementalis ventralis m 31: musculus salivarii ventralis m 32: musculus salivarii dorsalis m 33: musculus adductor palpi labialis m 34: musculus flexor paraglossae m 35: musculus abductor palpi labialis m 36: musculus palpi labialis anterior m 37: musculus palpi labialis posterior The tracheal system of the labial region is formed from one of the main branches of the traches ventralis;one (or occasionally more) of its branchlets may be called typical for the chief labial parts. Regio cervicalis (Pigs.

3-4) The fourth infraoesophageal region consists of the cervical region of the head. In insects, the use of the word "neck" or "cervix" is disputable, but since the literature employs it today unequivocally, we may also accept it. The seventh cephalic region extends from the occiput to the central point of the tentorium - where also the cervical muscles terminate - or to the borders of the post occiput. The cervical muscles therefore display some regional overlap with the previously discussed regions, but - as could be observed also in the case of the mandibular region - the regional borders cannot invariably be separated or defined as autochthonous layers.