432 



THE INVERTEBRATA 



Order HYMENOPTER A (Bees, wasps, ants, sawflies, etc.) 



Mouth parts adapted primarily for biting and often secondarily for 

 sucking as well; two pairs of membranous wings coupled together 

 by booklets fitting into a groove, hind wings smaller; ist segment 

 of the abdomen fused to the thorax, and a constriction behind this 

 segment commonly found; an ovipositor always present, modified 



Fig. 321. 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 ;^^. paraglossa. 



for piercing, sawing, or stinging; metamorphosis holometabolous ; 

 larvae generally legless, more rarely cruciform, with thoracic and 

 abdominal legs; pupae exarate, protected generally by a cocoon. 



This order is remarkable for the great specialization of structure 

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



