102 ELEMENTARY LESSONS ON INSECTS 



feeding both as adults and as larvae on aphids and scale 

 insects: hence, beneficial. 

 Note especially the: 



(a) The small head, overshadowed by the prothorax. 



(b) The polished surface of the body. 



(c) The color pattern. 



Fig. 41. — Diagram illustrating the seasonal habits of the imported Japanese beetle 

 (FromU. S. Dept. Agr.). 



10. The darkling beetles: Mostly blackish, somewha 

 flattened nocturnal beetles, very numerous in kinds and 

 varied in details of bodily form. Somewhat resembling the 

 ground beetles, but less active, and readily distinguished 



