journal of entomology and zoology 125 



Regions of Probable General Distribution 



Besides the regions mentioned where the common red spider 

 is known to be generally distributed, there are others equally 

 extensive where it is probably generally found, yet up to the 

 present we have no authentic record to show that it is found 

 generally distributed over these parts. It is very probable that 

 at present this red spider is generally distributed over the 

 eastern half of the United States, i. e., as far west as the dry 

 plains of western Dakotas, Nebraska, Kansas, Oklahoma, and 

 Texas; besides this vast area there are at least three small, 

 more or less local, regions in the far west where the pest is prob- 

 ably generally found. These are: (a) the Puget Sound region 

 in Washington State; {h) the Snake Valley region of south- 

 western Idaho; and (c) western Colorado. 



That the species is generally distributed over the eastern half 

 of the United States is indicated by the following facts : 



1. It has been recorded from Orono, Maine, and also from 

 Brownsville, Texas, thus showing that there is nothing in the 

 extremes of temperature due to climate that would prevent it 

 occurring throughout this area. 



2. There are no altitudes so great in this region that the 

 species could not thrive. 



3. Some of its common host plants are found in any part of 

 this area. 



4. It has been long enough introduced into these sections to 

 have become generally distributed. 



5. It has been reported from several different localities in 

 this region of probable general distribution. 



Although we have but a single record of T. telarius occurring 

 in the Puget Sound region, the writer is of the opinion that the 

 species is generally distributed here because the climate and 

 types of agriculture are very similar to those of the Willamette 

 Valley in Oregon, where I find the species in great abundance. 



In southwestern Idaho we have an authentic and a question- 

 able record. This area is given over very much to the raising 

 of fruit and other favorable hosts of the mites. The climate is 



