THE MOUNT DESERT REGION 155 



Ostomidae ( Trogositidae) 

 The Grain and Bark-gnawing Beetles 



Recent studies have lifted the curse that was on this family 

 for gnawing grain, as it appears that they are there to gnaw 

 the larvae of those that do. However, the best place to take 

 them is under bark, particularly where fungus is at work. 



Tenebroides Piller and Mitterpatcher 



T. corticalis (Melsh) (9994). Tarn under bark of dead 

 maple. Under bark of birch and Quercus borealis. Station 

 F387. 



T. sp. Under bark of dead maple at the Tarn, May 23. 



Calitys Thomson 



C. scabra (Thunb.) (9998). Taken from old fungus on 

 stump Bar Harbor, Oct. 7 (Br.). 



Thymalus Latreille 



T. marginicollis Chev. (10010). Bred from white birch 

 fungus Polyporus betulinus, July 27. Common. 



Nitidulidae. The Sap-feeding Beetles 



Any syrupy liquid with a fruit flavor w 7 ill attract these, but 

 the best bait I have found is cantaloupe rind placed loose in 

 some paper on the ground in an open, but shaded, place. 

 Any tiling that is fermenting is good bait. 



Colopterus Erichson 



C. truxcatus (Rand.) (10032). Bay Shore Drive sweeping, 

 Sept. 12. 



Conotelus Erichson 



C. obsctjrtjs Er. (10035). Large numbers in the flowers of 

 bind weed (Convolvulus) Middle Road early in July. 



