PREDACEOUS BEETLES. 107 



Forest tent caterpillar, Clisiocampa disstria. 



Army worm, Leucania unipuncta. 



Cotton worm, Aletia argillacea. 



Lime tree winter moth, Hybernia tiliaria. 



Spring canker worm, Paleacrita vernata. 



Fall canker worm, Anisopteryx pometaria. 



Oak Tortricid, Cacoecia fervidana. 



Rocky Mountain locust, Caloptenus spretus (nymphs) . 



This shows C. scrutator to be a very general feeder, and 

 that it is particularly fond of our common injurious lepidop- 

 terous larvas. When kept in confinement at the insectary, 

 single beetles killed on an average about four full-grown 

 gypsy moth caterpillars daily. Out of doors the number 

 killed would be increased, as the appetite of the beetles is 

 greater under natural conditions than when kept in confine- 

 ment. 



Calosoma scrutator is found in Canada and the New Eng- 

 land States, but is more locally than generally distributed. 

 It is more common in New York and the Middle States, and 

 occurs throughout the United States . Specimens were found 

 this year in infested woodland in Saugus, and through the 

 efforts of Mr. W. W. Stevens a number was received for 

 rearing purposes. The first beetles were received and placed 

 in breeding jars June 24. They fed readily and mated sev- 

 eral times, but only seven eggs were laid during the season, 

 six being laid by one female, June 26, and a single egg being 

 deposited by another female, July 1. It is probable that 

 this species, like the other Calosomas thus far observed, lay 

 the bulk of their eggs earlier in the season, and it may be 

 that the females had nearly finished depositing eggs before 

 being placed in confinement. 



A part of the eggs was preserved for further study, those 

 remaining in the jar hatching in eight days; all the larvse 

 died, however, before molting. This species does not thrive 

 in confinement as well as either frigtdum or calidum. August 

 9 a coarse wire cage was constructed near the insectary, in 

 which were placed nine females, which went into the ground 

 immediately, without taking food. This cage will be exam- 

 ined in the spring, and notes on the hibernation of the 

 species completed. 



