191Ji\ Animal Life of E'okth Cakolhsta T7 



plete is enlightening, but it becomes vastly more useful if it 

 also shows where and when the species are to be found. 



Let us see to what extent the geographical range of this 

 group as a whole has been, determined for our state. On this 

 point we can indicate the recorded distribution of 155 species. 



Records indicating distribution over whole state 28 species. 



Records indicating distribution on coast only i species 



Records indicating distribution in eastern half 22 species. 



Records indicating distribution in central portion n species. 



Records indicating distribution western half l6 species. 



Records indicating distribution mountains only 20 species. 



Recorded from few scattered localities 19 species. 



Recorded from only one locality 38 species. 



Remembering that we are now discussing a group of insects 

 which has immense latent powers for evil, it can readily be seen 

 that this kind of data, the more complete the better, can be 

 drawn upon in defining the area where damage is likely to be 

 serious when any species threatens. If a grasshopper suddenly 

 becomes a pest in any locality we have a valuable clue to the 

 possible ultimate meaning of the outbreak if we know the dis- 

 tribution of the species. If thorough records were available 

 for all we might say of any one species : 



'^This insect occurs only in such and such an area, hence 

 persons outside of this area are free from danger by it except by 

 its possible migration or artificial spread." Without such defi- 

 nite and comprehensive data we must wait for each outbreak to 

 show us, after the fact, just where each species is capable of 

 damage. This same kind of definite information, as to the dis- 

 tribution of all other groups of animals could be draw^n upon 

 in the same way. This group merely serves as a type to illus- 

 trate the point. Every man engaged in scientific work knows 

 how dangerous is the policy of oft'-handed and unguarded dec- 

 laration, but when, one has his opinions backed by ample evi- 

 dence secured by painstaking study of the facts, even his guess 

 is of value. 



(2) In the second group of insects, including the true bugs, 

 a very considerable body of data has been accummulated, though 



