ORISMOLOGY. 315 



ii. INSERTION. 



1. RETRACTED (Retractum). When the head is wholly 



withdrawn within the trunk. Ex. Parnns. 



2. INTRUDED (Intrusuin). When the head is nearly 



withdrawn within the trunk. Ex. Melasis. 



3. INSERTED (Insertum). When the head is partly 



withdrawn within the trunk. Ex. Buprestis. 



4. EXSERTED (Exsertum). When the head is quite 



disengaged from the trunk. Ex. Tenebrio, Blaps. 



5. AMPLECTED (Amplexum). When the head is re- 



ceived into a sinus of the thorax. Ex. Hister. 

 G. RECONDITE (Reconditum). When the head is wholly 

 covered and sheltered by the shield of the thorax. 

 Ex. Cassida, Lampyris. 



7. SEMI RECONDITE (Semireconditum). When the head 



is half covered by the shield of the thorax. Ex. 

 Silpha, Cyphon. 



8. RETRACTILE (Retractile). When an insect can at 



pleasure exsert its head, or withdraw it within the 

 trunk. Ex. Ulster,, Larva of Lampyris. 



9. VERSATILE (Versatile). When the head can turn 



nearly round. Ex. Hyme?ioptera 9 Diptera. 



10. PEDUNCULATE (Pedunculatum). When the head is 



constricted behind into a distinct neck. Ex. Apo- 

 derus Coryli, &c. 



11. SESSILE (Sessile}. When the head does not move 



in the socket of the trunk, but is attached to it by 

 a kind of ligament. Ex. Hymenoptcra, Diptera. 



iii. TERMINATION. 

 1. CLYPEATE (Clypeatum}. When the Nasm, Gena, 



