132 BIOLOGICAL SIKVKY OF 



Babyodma Thomson 



B. bimaculata Grav. (5806). Salisbury Cove, Aug. 11 ; Peni- 



kese in moat trap, Sept. 1!'. 

 B. sp. Feather and bone trap left over winter at Sea Wall, 



May 28. 



Pselaphidae. The Ant-loving Beetles 



They live beneath hark and stones and feed on minute forms. 

 When turning stones for them, do not hurry, for they often 

 "play dead." Sifting dry trash in the winter is productive 

 and 1 have taken them by sweeping around swamps at dusk in 

 the autumn. They excrete a substance of which ants are fond 

 and so are tolerated and found in ants' nests. 



It is said that several species of these beetles are on the 

 border line between parasitism and predatism. See Ann. Ent. 

 Soe. Amor, 3:581-601, 1943, and Ent. News, 8:197, 1<>44. 



Basolum Case; 



B. sp. The only one taken. The genus is clear hut specialists 

 could not give an opinion on species. Gt. Heath, Aug. '38. 



R eii n en B.u'iii a ] ieaeb 



R. ixsoleta Csy. (6266). Tremont flying at dusk, Oct. 10. 

 Under hark on log Quercus borealis. 



BRACHYGLUTA Thomson 



B. abdominalis! (Aube) (6230). Pretty Marsh Landing 



under stone with ants, Aug. 21. 

 B. sp. Flying at dusk on edge of swamp in Tremont. All 



were females so species cannot he determined. 



Rybaxis Saulcy 



lv. conjuncta Lee. (0310). Great Heath, Oct. 5, '35, sweep- 

 ing (Br.). 



Et. clavata (Bndl.) (0311). July 4. 



lv. sj). A female which prevents determination. Tremont, 

 flying at dusk, Oct. 10. 



