18 Proceedings of the Biological Society of Washington. 



Table I 



In the Polyporaceae, Polyporus versicolor appears to attract the most 

 species, 23 having been found associated with this form. However, 

 Polyporus gilvus, P. albellus, P. dichrous, P. hirsutus, P. betulinus, P. 

 berkleyi and Lenzites betulina, are also beetle favorites. In the Agara- 

 caceae, Pleurotus ostreatus was found to harbour 25 species. The 20 species 

 marked by an asterisk under the name of this fungus were found in a 

 single specimen on June 27 at Cornwall, Conn., by Mr. K. F. Chamber- 

 lain. The fact that this fungus is tougher and more persistent than 

 most other gill fungi may account for its being a favorite. 



Many of the gill fungi are attacked as soon as they appear above ground, 

 while as a rule, the polypores may attain considerable growth, in fact 



