THE GENUS CALOSOMA. 45 



In 1909 two males and two females were collected near Boston 

 about April 15. Mr. R. Wooldridge stated that he saw three adults 

 on June 18, feeding upon caterpillars of P. dispar in Wellesley, Mass. 



On July 31 Messrs. Fiske and Burgess, while in Tamworth, Sand- 

 wich, and North Conway, N. H., investigating the natural enemies 

 of Heterocampa guttivitta, found upwards of 100 beetles in a small 

 infested area, and in one square yard of leaf mold collected 12 second 

 and third stage larva? of frigidum. The latter were fed and reared 

 to maturity at the laboratory. 



In 1910, 11 males, 7 females, and 2 larvae were received, some of 

 which were forwarded by Messrs. P. J. Parrott and H. E. Hodgkiss 

 of Geneva, N. Y. Mr. Parrott collected these beetles at Geneva, 

 Gates, and Seneca Castle, where they were found feeding upon cut- 

 worms (Xylina sp.). One specimen was taken while feeding upon 

 caterpillars of Euproctis chrysorrhcea at Cape Elizabeth, Me. 



In the season of 1912, 71 males and 38 females were collected and 

 forwarded to the laboratory between June 1 and June 30. During 

 these years many specimens were seen in the field but were not 

 collected. The adults were frequently taken running up and down 

 the trunks of trees. 



HABITS OF ADULTS. 



In order to check up the field observations on the climbing habits 

 of this species an experiment was tried with a pair of adults using the 

 apparatus shown in Plate III. The beetles climbed to the top of the 

 tree immediately and with considerable speed. They climbed over 

 the tree at will and were not once seen to fall during the few hours 

 they were left in the experiment. Adults of this species have fre- 

 quently been reported as fairly common in certain localities in the 

 gipsy -moth infested area, especially under burlaps where they were 

 doing appreciable good in feeding upon the caterpillars. The senior 

 writer x found them common in localities in New Hampshire in 1909, 

 where they were observed climbing the trees and feeding freely upon 

 larvae of Heterocampa guttivitta. 



All'indications point to the fact that the adults of this species find 

 most of their prey on the trees, but the larvae have very different 

 habits as is pointed out in another part of this paper. 



FOOD CONSUMED BY ADULTS. 



Feeding records of adults were conducted through 1909, 1910, and 

 1911, but each year with different pairs, as in all the cases except 

 one the beetles died before a second year's notes could be secured. 

 Caterpillars of Malacosoma americana and Porthetria dispar were 

 offered for food and the beetles attacked them voraciously. Some 

 of the beetles were collected in eastern Massachusetts and others 

 were reared at the laboratory. The records for 1909 and 1910 are 

 contained in Table 9. 



i "Burgess, A. F.. Notes on Calosoma frigidum Kirby, a native beneficial insect. In Jour. Econ. Ent., 

 V. 3, no. 2, p. 217-222 (p. 218), 1910. 



