HOW TO KNOW THE IMMATURE INSECTS 



28b. Lanrae usually long and slender; (a) terristrial species: spiracles 

 on several abdominal segments, the caudal pair is much larger: 

 (b) aquatic species may have gills or breathing tubes at caudal 



end of abdo- 

 men. Fig. 81. 

 Order 

 DIPTERA 



page 189 



Fig. 81. MyiotroM ♦•<>'•• •-. 



Fig. 82. 



morium 



mum (Bruckley) 



(U.S.D.A.) 



Men«< 

 lini. 



29a. Larvae usually U-shaped, more or less pointed at 

 both endi and larger in mid-region; live within 

 plant tissues or live in cells or nests; mouth parts 

 may be reduced to a pair oi opposable (or nearly 

 so), sharp-pointed mandibles or to sclerotized plates 

 fused with the cephalic segment or to more fleshy 

 sensoria. Fig. 82... Order HYMENOPTERA page 210 



Fig. 83. a, ftli«f«l«tli cin- 

 Sulata (Loew); b, A syr- 

 phid lorva. 



Larvae epindle-like or peg-like with 

 cephalic ead pointed and mouth parts 

 usually 1 or 2 hook-like structures em- 

 bedded in the prothorax; or the mouth 

 parts greatly reduced; aquatic species 

 may show 1 or several vemtral pro- 

 legs and a caudal breathing tube or 

 gills. 

 Fig. 63 Order DIPTERA page 189 



•"sf*^f^i^n 



Fig. 84. Q, Flat-headed apple tree 

 borer, ClirvB^toHiri* f«M«r«t« 



(Oliv.) (U.S.D.A.); b, Round-heod- 

 ed apple tree borer, S«Mrd« tmn- 

 dida Fab. (U.S.D.A.). 



90a. Labrum a single lobe; ambula- 

 4orial worts may occur on ab- 

 domen; many species live in 

 wood. 



Fig. 64. ..Order COLEOPTERA 

 page 72 



44 



