HOW TO KNOW THE INSEOS 



24a Apical (first posterior) cell strongly narrowed or closed 

 at wing margin (a). (The Flesh Flies.) Fig. 224. 



Fami ly 76, METOPIIDAE 



Figure 224. 



Fig. 224. Lucllla caesar L. The Green 

 Bottle Fly. 



Abdomen bright me"talllc blue or oftener 

 green. Common around garbage and carrion. 

 Length about 8 mm. (From U.S.D.A.) 



The members of this family are moderately 

 small to medium sized files. Many are 

 mottled gray and black. Others have their 

 abdomens metallic green or blue. The lar- 

 vae are largely scavengers, and flesh 

 feeders. Some are parasitic. 



24b Apical cell not at all narrowed at wing margin (c) . Fig, 

 225. Fami ly 74, MUSCIDAE 



Fig. 225. Hylemxla brasslcae 

 (Bouche) The Cabbage Maggot, 

 (a, Dorsal view; b, side view.) 



Black and gray. The maggots 

 live In the roots of cabbage and 

 related plants producing decay. 

 Length 5-6 mm. (From U.S.D.A.) 



Fierure 225, 



KEY TO THE MORE COMMON FAMILIES OF THE ORDER HYMENOPTERA 



1a Base of abdomen broadly joined to the thorax Us in Fig. 



229) 2 



1b Abdomen joined to thorax by a slender petiole of varying 

 length (As in Fig. 241) 5 



2a Fore leg with but one terminal spur on tibia 3 



2b Fore leg with two terminal spurs on tibia 4 



3a Ovipositor rigidly exserted, nearly half as long as abdomen; 

 antennae not clubbed; wood borers. (The Horn Tails.) Fig. 226. 



Family 5, SIRICIDAE 



106 



