INSECTS, AND THEIR RELATION TO MAN 177 



name might be written in a directory as Jones, John, the 

 group name coming first, and the special name last. Fur- 

 ther, Orders make Classes, Classes make Branches or Phyla, afid 

 Branches make Kingdoms, as the Animal Kingdom or Plant 

 Kingdom. Thus we might tabulate the typhoid fly as follows : 



Kingdom, Animal. 



Branch, Arthropoda or joint-legged animals. 

 Class, Insecta. 

 Order, Diptera. 

 Family, Muscidse. 

 Genus, Musca. 



Species, domestica. 



j. Field Work (Optional) 



Observations. Collect as many different kinds of insects as you can. 

 Bring them to the classroom or to your home. Sort them into the dif- 

 ferent orders, placing each order in a separate box. Try using the follow- 

 ing identification table, or synopsis. 



IDENTIFICATION TABLE OF SOME CLASSES AND 

 ORDERS OF ARTHROPODA 



A. With three pairs of legs. 



B. With jawlike mouth parts, for biting. 



C. The two pairs of wings unlike in structure. 

 D. Fore wings meeting in a straight line, hard and "sheath- 

 winged"; hind wings crumpled. Coleoptera (sheath-winged). 

 DD. Fore wings leathery and commonly meeting in a straight 

 ridge ; hind wings folding lengthwise like a fan. Orthoptera 

 (straight-winged). 

 CO. The two pairs of wings alike in structure. 



D. With many "nerves" in the wings. No sting. Neuroptera 



(nerve-winged). 

 DD. With few "nerves" in the wings. With a sting. Hymen- 



optera (membrane-winged) . 

 BB. Mouth parts tubelike, for sucking. 

 0. Two pairs of wings. 



D. Wings covered with powdery scales. Lepidoptera (scale- 

 winged). 

 SHARPE'S LAB. MAN. 12 



