THE INSECTS QF NEW JERSEY. 25 



importance of certain of these flies to the human race has only 

 come to be appreciated in very recent years. 



An offshoot from the Diptera, which has become partially 

 parasitic, we find in the fleas, for which the ordinal term Sipho- 

 n apt era is used. They are wingless, laterally compressed, and 

 live as adults on warm-blooded, hair or fur-coated animals. 



In a graphic form the scheme of classification is shown on 

 the accompanying diagram. (See p. 26.) 



For convenience of cataloguing, the sequence of the orders is 

 modified so that all the neuropterous forms are grouped together 

 before the Rhyngota } irrespective of the series to which they 

 belong in point of development. 



