6 Proceedings of the Biological Society of Washington . 



Megalodacne fasciata Fab. In Polyporus lucidus, Polyporus versicolor 

 and feeding on Pleurotus sapidus, Springfield, N. J., May 30. 



Megalodacne ulkei Crotch. On Polyporus cuticularis, Indiana (Col. Ind. 

 p. 545). 



Ischyrus 4-punctatus Oliv. Feeding on and breeding in Poria sp., Spring- 

 field, N. J., July 10. 



Mycotretus pulchra Say. Breeds in Polyporus chioneus, Monmouth Jc, 

 N. J., Sept. 8. 



Tritoma humeralis Fab. Feeding on Clitocybe maxima, Framingham, 

 Mass. (Frost). 



Tritoma biguttata Say. On Armillaria sp., Monmouth Jc, N. J., July 7. 



Tritoma thoracica Say. On Pleurotus ostreatus, Cornwall, Conn., June 27 

 (Chamberlain). Feeding on P. ostreatus, Monmouth Jc, N. J., 

 May 30. 



Tritoma flavicollis Lee On Pleurotus ostreatus, Cornwall, Conn., June 

 27 (Chamberlain). 



Family Mycetophagidae. 



Mycetophagus flexuosus Say. On Pleurotus ostreatus, Cornwall, Conn., 

 June 27 (Chamberlain). On Polyporus berkleyi, Framingham, 

 Mass. (Frost). In Polyporus versicolor, South River, May 14, 

 Riverton, May 5; in Polyporus albellus, Union, Sept. 12; on 

 Polyporus galaclinus, Union, Sept. 12; in Polyporus betulinus, 

 Princeton Jc, May 8; in Polyporus tsugae, New Brunswick, 

 N. J., Sept. 24. 



Mycetophagus melsheimeri Lee On Pleurotus ostreatus, Cornwall, Conn., 

 June 27 (Chamberlain). 



Mycetophagus punctatus Say. On Pleurotus ostreatus, Cornwall, Conn., 

 June 27 (Chamberlain). Feeding in Polyporus amorphus, New 

 Brunswick, N. J., July 26. 



Mycetophagus pluriguttatus Lee In Daedalia confragosa, New Bruns- 

 wick, N. J., April 9. 



Crosimus hirtus Casey. On Daedalia quercina, Monmouth Jc, N. J., 

 June 12. 



Litargus didesmus Say. On Naucoria sp., Framingham, Mass., July 

 (Frost). 



Family Dermestidae. 



Attagenus piceus Oliv. In Lenziies betulina, New Brunswick, N. J., 

 March 6. 



Family Histeridae. 



Hister unicus Csy. On Clitocybe robusta, Framingham, Mass., July 



(Frost). 

 Hister sedecimstriatus Say. On Polyporus berkleyi, Framingham, Mass., 



August 5 (Frost). 

 Hister abbreviatus Fab. On Pleurotus ostreatus, Cornwall, Conn., June 



27 (Chamberlain). 



