THE SAW-TOOTHED GRAIN BEETLE 



351 



give the name to the species (Fig. 360). The larva is a slender 

 white worm with dark markings. There are from four to six or 



FIG. 358. The confused flour beetle; a, beetle; 6, larva; c, pupa; all enlarged; d, 

 lateral lobe of abdomen of pupa; e, head of beetle showing antennae; /, same of a closely allied 

 form. (After Chittenden, U. S. Bu. Ent.) 



CL 



FIG. 359. The yellow meal worm; a, larva; 6, pupa; c, female beetle; d, egg with surrounding 

 case; e, antenna; all much enlarged. (After Chittenden, U. S. Bu. Ent.) 



more generations in a year; the entire life cycle occupies about 

 twenty-four days in midsummer. The pupal stage is passed in 

 the grain, several kernels being fastened together to form a pupal 



