HOW TO KNOW THE IMMATURE INSECTS 



125a. Hypopharyngeal bracon absent; usually with segmented 

 legs 126 



125b. Hypopharyngeal bracon present; usually 

 without segmented legs. Fig. 331 136 



HYPopHH.K.rtSeAi, 



Fig. 331. Ventral as- 

 pect of head, show- 

 ing the hypopharyn- 

 geal bracon. 



126a. Mandible simple, distally either with a broad transverse gouge- 

 like cutting edge, or with a simple apex 127 



126b. Mandible dentate, distally with from 2 to 5 

 teeth. Fig. 332 129 



127a. Prementum and mentum fused, bearing a common median es- 

 cutcheon-like sclerome with a pair of light, circular areas anter- 

 iorly. Fig. 333 Family BRUCIDAE 



The members of this fam- 

 ily number no less than 900 

 species and they are fre- 

 quently known as pea and 

 bean "weevils". Their larvae 

 undergo a hypermetomor- 

 phosis in which the first in- 

 star is more or less carabi- 

 f orm with well-developed 

 legs. The first molt occurs 

 in the host and the body 

 becomes eruciform and most- 

 ly apodous and blind. No 

 less than 50 species are of 

 economic importance. 



AID 



U-Si/SMef^n/j^ 



Fig. 333, 

 (L); b, 



a. Pea weevil, 

 Labium. 



BrHchus pUorum 



127b. Prementum and mentum distinct, 

 ome 



without escutcheon-like scler- 

 128 



121 



