SMITHSONIAN INSTITUTION LIBRARIES 



3 9088 01272 7046 



auy locality, a few individuals are apt to emerge some days ahead 

 of the main swarm, and likewise some few may be retarded until 

 early in June. 



A REQUEST. 



It has been the policy of this Division for many years to collect 

 data concerning each of the several broods of this insect, with 

 the object of eventually obtaining a basis for an accurate statement 

 from time to time, for the benefit of fruit growers, of exactly what 

 localities in the country will be visited by its swarms. An excep- 

 tional opportunity to more accurately determine the limits of Brood 

 X (Marlatt) occurs this year by reason of the fact that no other 

 broods will make their appearance in conjunction with it. At its 

 last appearance, in 1885, this brood was associated with the thirteen- 

 year brood, known as XXIII (Marlatt). In many districts where 

 the territories occupied by the two were adjacent or overlapped, it 

 was naturally impossible to assign individuals to one or the other. 

 Likewise in 18G8, the simultaneous emergence of the thirteen-year 

 brood known as XIX (Marlatt), which will not happen again until 

 the year 2089, caused some confusion along the Southern and West- 

 ern borders. The present season, however, no such complications 

 exist. 



Persons who receive this circular will, therefore, be able to mate- 

 rially assist the Division by sending information as to whether 

 swarms do or do not appear in their locality. Such informatic^n 

 from the outlying portions of the known range and from the coun- 

 ties followed by interrogation marks in the preceding list is especially 

 desired. A large number of reports, however, from within the ter- 

 ritory known to be infested will be scarcely less valuable, because 

 they will throw light upon the effect that the settlement of the coun- 

 try, the building of towns, and the removal of forests have had upon 

 the insect. 



W. D. Hunter, 



Investigator, Division of Entomology. 

 Approved : 



James Wilson, 



Secretary. 



Washington, D. C, March 13, 1902. 



