April, '10] BURGESS: CALOSOMA 221 



Several of the larvae included under the column ' ' Diseased ' ' prob- 

 ably died from exposure to heat. 



No later examination of this territory could be made so it is impos- 

 sible to state from actual counts the percentage of pupae that were 

 destroyed before the beetle larvie became fidl fed. 



The data available showing the amount of food consumed by the 

 larvae of frigidum in its different stages is far from complete but 

 from such feeding records as have been obtained at the Gypsy Moth 

 Parasite Laboratory, together with those secured by the writer several 

 years ago when the life history of this species was investigated,* it 

 appears that the following amount of food for each stage is a very 

 conservative estimate; first stage 2, second stage 5, and third stage 7 

 full grown gypsy moth larvae. 



If the beetle lar\^£e found continued to feed until full grown or 

 "until the food supply was exhausted, as would be the case in some of 

 the areas examined, they would at the end of the season destroy, on 

 the average for all the areas examined, 92 per cent of the pupae 

 present. 



It is, of course, impossible to determine the number of Heterocampa 

 larvas that were destroyed by the beetles and their larvae but from 

 the above data it is easy to see that the increase of the species was 

 greatly retarded during the past season, in the localities mentioned, 

 by this beneficial insect. 



Calosoma frigidum is found throughout New England and is often 

 present in large numbers during outbreaks of caterpillars. There are 

 specimens in the United States National Museum at "Washington, 

 D. C, which were taken in Illinois, Maryland and Michigan, which 

 indicates that this insect has a wide range. 



It is probable that the unusual increase of this species in the in- 

 fested district in New Hampshire is due largely to the abundance of 

 a satisfactory food supply. A study of the reproductive habits of a 

 limited number of specimens, made by the writer in 1896, showed that 

 186 eggs were deposited, in one case, by a female fed in captivity, 

 and observations which were continued the following year led to the 

 discovery that eggs are laid by some females for two successive years. 

 The habit of the Heterocampa larvae of pupating on the ground 

 beneath leaves and rubbish makes them particularly susceptible to 

 the attack of the larvje of this beetle, which naturally feed in such 

 situations. The larvae of Calosoma sycophanta have been found 

 climbing trees, especially those that have rough bark, where they 



* Notes on certain Coleoptera liiiown to attaclv tlie gj'psy moth, 44th Annual 

 Report Mass. State Board of Agriculture, 1896, p. 412-426. 



