6 NEW ZEALAND ENTOMOLOGY. 



Order II.— HYMENOPTERA. 



Wings four, membranous, the posterior pair being the 

 smaller, and connected with the anterior during flight by 

 a row of minute hooklets ; mouth masticatory, the maxillae 

 and labium being elongated, in many of the families, into 

 a long sucking instrument or " tongue." Metamorphosis 

 as in the Coleoptera. A large Order, containing the 

 numerous tribes of Sawflies, Bees, Wasps, Ants, and Ich- 

 neumon-flies. (Plate III.) 



Order III.— DIPTERA. 



Wings two ; the posterior pair represented by two 

 minute clubbed appendages termed poisers ; mouth a 

 suctorial tube formed by an elongation of the labium, 

 enclosing within it a variable number of setae answering 

 to the mandibles, &c, of biting insects. The larva without 

 legs, a distinct head being often absent. The pupa in- 

 active, the limbs of the imago firmly attached to the body,, 

 but plainly visible. Among the majority of species in- 

 cluded in this Order the larval skin is not cast away, but 

 envelopes the insect in a hard shell ; the true pupa is con- 

 sequently only visible on the removal of this covering, 

 when it is found to closely resemble those in which no such 

 arrangement occurs. The Order comprises the numerous 

 Gnats and two-winged Flies. (Plates IV., V., VI., VII.) 



Order IV.— LEPIDOPTERA. 



Wings four, generally covered with scales ; the anterior 

 pair slightly superior in size ; mouth suctorial, the 

 maxillae forming a spiral tongue, which is coiled be- 

 tween the large labial palpi when not in use ; other oral 

 organs rudimentary. In many instances the whole mouth 

 and alimentary canal are more or less obliterated, a con- 

 siderable number of the species taking no food in their 



