406 BOARD OF AGRICULTURE. [Pub. Doc. 



trees, and a cage with a ground area of about a square yard 

 was built. About the middle of June ten males and a like 

 number of females oifrigidum were placed in the cage, with 

 plent}' of caterpillars. Some of the beetles paired the fol- 

 lowing day, and on examining the ground June 28 a beetle 

 larva was found. Subsequent examinations, however, failed 

 to bring to light any larvae, and, as ants were numerous in 

 the cage, this doubtless accounts for the non-development of 

 larvse that may have hatched. 



The killing of young beetle larvae by the common black 

 ant (^Camj)onoius pennsylvanicus DeG.) has been previously 

 noted. Several jars containing newly hatched larvae of 

 (7. frigidum were accidentally left uncovered over night. 

 In the morning seven of the eleven larvae present had been 

 killed, and the ants were feeding on the bodies. One hun- 

 dred and six larvaj which were placed in another outdoor 

 cage during the season suffered in the same manner from 

 ants, and not one completed its transformations. 



Some of the larvae reared in jars until nearly full grown 

 were placed in small cages out of doors, but they were so 

 badly attacked by mites * that none pupated successfully. 

 In one of these cages a larva of this species was attacked 

 by a wire-worm {Asaphes sp. ?), the integument being rup- 

 tured so badly that the larva died.f 



Calosoma scrutator (Fab.). 



This beetle, known under the common names of beautiful- 

 bodied searcher, rummaging or green Calosoma, has for 

 years been recognized as one of the most useful predaceous 

 insects. Almost every report on injurious insects credits it 

 with preying upon noxious species. The following list of 

 some of the injurious larva which this beetle has been 

 known to attack has been compiled from various sources : — 



Tobacco worms, Protoparce (sp. ?). 

 Gypsy moth, Porthetria dispar (pupa also). 

 Tent caterpillar, Clisiocamp)a americana. 



* Through the kindness of Dr. L. O. Howard these mites have been determined 

 by Mr. Nathan Banks as an immature stage of a species of Histiostoma. 



t A somewhat similar occurrence has been mentioned by Riley in "Insect Life," 

 vol. II., p. 299. 



