382 THE GYPSY MOTH. 



needed. In five days ninety-three caterpillars were de- 

 stroyed, only portions of the larval skins remaining. The 

 beetle was fed for two weeks with various species of cater- 

 pillars and the larvae of leaf-eating beetles. There seemed 

 to be no choice made of the different species of caterpillars 

 supplied, but all were in due time attacked and more or less 

 eaten. From the number of caterpillars eaten in the five 

 days, Mr. Rowe estimates that the average daily consump- 

 tion of this beetle is about equal to six full-grown gypsy 

 moth caterpillars. Mr. Rowe also reports the larvse of two 

 species of Harjpalus feeding on young gypsy moth cater- 

 pillars. 



For the purpose of ascertaining more fully the habits of 

 the predaceous beetles, the following species were observed 

 in confinement, in the insectary at Maiden, during the sum- 

 mer of 1895, and later they Avere confined and fed in cages 

 out of doors. One specimen of Calosoma scrutator was 

 brought in June 28, and put into a cage with ten gypsy 

 moth caterpillars, which were at once attacked by the beetle. 

 The favorite place of attack seemed to be the middle of the 

 body. As the viscera of the caterpillar came out the beetle 

 chewed away steadily, apparently seeking the fatty parts. 

 In two days fourteen caterpillars were eaten. At the end 

 of this time the beetle was placed in a cage with another 

 individual of the same species. July 1, the two beetles 

 killed seven gypsy moth caterpillars, and eleven more were 

 put in the cage. The next day ten were dead, and ten more 

 of the fourth and fifth molt were put in. One caterpillar 

 pupated, and the pupa was destroyed by the beetles. July 

 3, si;*: caterpillars were killed, and eight more of the fourth 

 and fifth molt were put in. July 4, one of the beetles died. 

 The remaining beetle killed four caterpillars July 5, but 

 died on the next day, after killing two more caterpillars. 

 These two beetles killed, in all, thirty-six gypsy moth 

 caterpillars. 



Another individual of this species was placed in a cage 

 July 2, and kept supplied with gypsy moth caterpillars. 

 July 18, another beetle of the same species was placed in the 

 cage and supplied with food. The first beetle, during the 



