49^ THE INVERTEBRATA 



This order is remarkable for the great specialization of structure 

 exhibited by its members ; for the varying degrees to which social life 

 has developed, and for the highly evolved condition which parasitism 

 has reached. 



Specialization of structure is evidenced in the mouth parts of the 



an. 



Fig- 343 • Head and extended mouth parts of the honey bee, Apis mellifica. 

 After Cheshire, an. antenna; gal. galea; gs. glossa; Ibr. labrum; Ip. labial 

 palp; md. mandible; mxp. maxillary palp; oc. ocellus; pg. paraglossa. 



Hymenoptera. The biting mouth parts of the phytophagous and 

 carnivorous sawflies closely resemble those of the cockroach. In the 

 wasps, e.g. Vespa, which are predaceous, the mouth parts are adapted 

 for licking as well as for biting. The maxillary laciniae are reduced 

 but the galeae are enlarged into broad setose membranous lobes which 

 absorb juices. A correspondingly large bilobed glossa occurs on the 

 labium. 



