April, '16] BRITTON: DIPRION SIMILE 281 



growth before the grubs are actively feeding the following summer, is 

 a good crop to follow on grub-infested land. Likewise small grain 

 <;rops are not greatly injured by grubs and should be used for grub- 

 infested ground in preference to the more susceptible crops such as 

 corn. Aside from the rotations mentioned above, it is desirable to so 

 arrange the crops that the least amount of land will be in timothy and 

 small grain the year the beetles are abundant, and the following year 

 to plant corn or other susceptible crops in corn ground or ground which 

 was kept thoroughly cultivated during the flight of the beetles the 

 year before, and to plant small grain or clover on ground which was in 

 these crops the previous year. 



The farmer should plow land suspected of containing grubs previous 

 to October 15 the fall following a big flight of beetles and select a crop 

 for the following year according to the presence or absence of grubs. 



Miscellaneous Directions. — The collection of the beetles by 

 hand or by means of a trap lantern, or by sprajdng trees upon which 

 they feed with an arsenical, has been employed in certain European 

 countries and no doubt would prove of value in this country, but to 

 be effective it is necessary that entire communities work together and 

 adopt the measures. 



Collecting the grubs behind the plow by hand, utilizing boys or 

 cheap labor for this purpose, is of much value although similar results 

 can be obtained by employing hogs or chickens as mentioned above. 



FURTHER NOTES ON DIPRION SIMILE HARTIG 



By W. E. Britton, State Entomologist, New Haven, Conn. 



The writer has already called attention in the Journal of Economic 

 Entomology (Vol. 8, p. 379, June, 1915), to the occurrence of this 

 European pine sawfly in Connecticut. That article will enable one 

 to recognize the species, and also points out the possibility that it 

 may prove a destructive pest in this country as it is in Europe. He 

 now wishes to add a few data collected in the further study of this 

 insect since the former article appeared in print. 



Diprion simile is present in Connecticut not only at New Haven, 

 but also at Derby, ten miles westward, at Hartford thirty-seven miles 

 northward, and at New Canaan, about thirtj^ miles, and Greenwich 

 about forj'-five miles westward. Greenwich and New Canaan are 

 border towns adjoining New York state where it may be expected 

 that this insect will soon appear. 



As this sawfly was found to be present in five rather widely sepa- 

 rated localities in Connecticut, it was probably too late for extermina- 



