50 



BULLETIN 380, U. S. DEPARTMENT OF AGRICULTURE. 



Endothia fluens, while common to Europe, Asia, and America, has 

 a much more limited range in the United States than E. gyrosa. It 

 is fairly common on Castanea and Quercus from southern Pennsyl- 

 vania and Ohio to northern Mississippi and Alabama. In south- 

 eastern Pennsylvania it has been found so far only on roots of 

 Quercus, and in northern Mississippi and Alabama only on Castanea 

 dentata. 



Endothia flu-ens missis sip piensis was first sent to the writers from 

 Corinth, Miss., by Mr. T. E. Snyder, of the Bureau of Entomology, 

 and has since been collected in only four other localities, three near 

 the northeastern corner of Mississippi and one in central Kentucky. 



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Fig. 2. — Outline map of the United States, showing the distribution of Endothia fluens. 



As both Endothia gyrosa and E. fluens were collected in this 

 country nearly a century ago by Schweinitz, it seems altogether 

 probable that they are indigenous species which may have already 

 reached the limits of their natural ranges in this country. 



While the maps (figs. 1-4) do not give by any means every locality 

 where Endothia is to be found and specimens are likely to be col- 

 lected at many points outside the present known range, the writers 

 feel justified in assuming that these maps represent the limits of 

 the territory where Endothia gyrosa and E. fluens may commonly be 

 found. This is especially true in the eastern portion, where the field 

 has been rather thoroughly worked. It is unlikely, for instance, 

 that E. fluens occurs abundantly in southern Alabama and Georgia, 

 where E. gyrosa was found so commonly. Southeastern Pennsyl- 

 vania must be somewhere near the northern limit for E. fluens, for 

 the writers' four collections in that region are the result of six days' 



