ARTHROPOD. \ 



22 I 



FIG. 225. Doryphora decemlineata, the Colorado or potato beetle. 1, portion of a potato 

 plant: a, eggs, b, larva;, and c, beetle; 2, full-grown larva; 3 and 4, pupae; 5, adult beetle; 

 6, antenna ; 7, mandible, a, from above, b, from below; 8 a, first maxillae; 8 b, second 

 maxillte; 9 a, entire leg; 9 b, tarsus from above. (Photographed from a Leuckart-Nitsche 

 w.tll chart by the author; permission of Dr. C. Chun.) 



larvae feed on the roots of plants and have a very hard outer 

 skin, so that they have received the popular name of wireworms. 



Order 9. Hymenoptera 



The Hymenoptera (Gr. v/jli]v, membrane, and irrepov, wing) 

 are represented by such insects as the ants, bees, and was [is. 



