n6 



ELEMENTARY ENTOMOLOGY 



black with numerous red or orange markings and is one of the 

 most serious pests of cabbage throughout the South, feed wholly 

 on vegetation. Small green species (Thyanta cttstator and Penta- 

 toma sayi] have done serious injury to grain and forage crops in 

 Texas and Colorado in recent years. The little Negro-bugs of a 

 nearly related family (Corimelaenidae] are jet-black and have the 



FIG. 155. The harlequin cabbage-bug 



a, b, adults (natural size) ; c, side view of head with mandibular and maxillary setae out of 



beak ; d, eggs with newly hatched young ; e, nymphs ; /, egg masses with one egg hatching 



and newly hatched nymph on lower right mass 



scutellum enlarged so that it covers nearly the whole abdomen 

 and gives the bug the appearance of a beetle, for which it is fre- 

 quently mistaken by a beginner. They infest various plants and 

 often injure berries by imparting their disagreeable odor, as do 

 the stink-bugs. 



Plant-bugs. The remaining families of Heteroptera feed entirely 

 on vegetation and may for convenience be grouped together as 

 plant-bugs. They are all more or less elongate in form, with slender- 

 legs, and antennae about half the length of the body. The families 



