:;i 



The fleas (Fig. 31), which are often included in the 

 Diptera, are sometimes considered as ;i distinct order. They 

 ditfer from the other Dipttera in being wingless, and in the 

 structure ofthelarva. They agree in the complete meta- 

 morphosis anl in the sucking mouth parts. 



Order X. Hymenoptera. The Membrane- winged 



Insects. 



The order includes such well-known insects as tin* bees, 

 \v;is|is and ants, and an enormous number of very small and 

 inconspicuous insects which are highly beneficial from their 

 habit of living parasitically in or upon other insects. The 

 members of this order (Figs. 82 and 33) possess two pairs 

 of membranous wines, and there is generally a distinct con- 

 striction between the thorax and abdomen ; sometimes, as in 



Fig - . 32 HymenDptcra. Carpenter bee. 

 Slightly reduced. (Original ) 



Fig - - 33- Hymenoptera. Leaf-cutting 1 bee. 

 About \h times natural size. (Original.) 



