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Islands. We are now anxious to determine the extent of dis- 

 tribution that useful parasite has attained. You can assist us 

 in the determination of this important fact by collecting and 

 mailing to us a lot of the horn fly pupae. These should be col- 

 lected upon portions of the ranch differing in climate and 

 altitude, kept separate and each parcel labeled indicating 

 these conditions. This pupa, which is about one-twelfth of an 

 inch wide and about twice as long, and dark brown in color, is 

 usually to be found on the inside of the crust of droppings 

 about three or four days old. 



At the conclusion of breeding we shall be glad to report re- 

 sults. 



Yours truly, 



Jacob Kotinsky, 

 Assistant Entomologist. 



In response to this appeal for assistance but one man, Mr. 

 D. T. Fleming, of the Maui Agricultural Company, sent speci- 

 inens. It is true that correspondents on Kauai and Molokai 

 also sent material, but those were replies to special requests. 

 My thanks are due these gentlemen for the assistance rendered. 

 NotAvithstanding the meagre cooperation on the part of ranch 

 •managers, it Avas ascertained that at least the European horn 

 fly parasite (/S*. hirta) exists on the five larger Islands, and 

 that the native ( "?) species {8. lanaiensis) occui's on Hawaii, La- 

 nai and Oahu. Moreover, about 75% of the pupae received from 

 Molokai were parasitized. In conversation, Dr. V. A. Nor- 

 gaard, the Territorial Veterinarian, informs me that the para- 

 site is responsible for considerable reduction of the pest ai 

 some seasons of the year, and it is evident that it is some cheek 

 upon the horn fly at all times. 



While on a visit to Kona last November the ranchmen there 

 complained bitterly of the horn fly, yet when search was made 

 for the pupae only three were found in the course of two hours 

 This may be explained either by the particular locality or the 

 season, or both. 



Any ranch manager might determine for himself whether 

 or not the parasite exists on his ranch. It is presumed that 

 ,he is familiar with the appearance of the fly and its pu}iae. 



