418 
Records of the Introduced and Immigrant Chalcid-Flies 
of the Hawaiian Islands (Hymenoptera). 
BY =P. Ef. LiIMBERDAKE: 
(Presented at the meeting of December 6, 1923.) 
The purpose of this paper is to provide a list of all known 
adventive Chalcid-flies found in the Hawaiian Islands, together 
with records of their distribution on the different Islands and 
dates of their introduction or first capture. Although host 
records are not a primary concern of this article, yet many of 
these records are given incidentally or for the purpose of 
designating more definitely certain undescribed species. 
Records of 144 species are here brought together. Of these 
at least twenty-four species have been purposely introduced, in 
three instances subsequently to the first capture of the species, 
which at the time had not been recognized to occur in the 
Islands. A considerable number of other Chalcid-flies have 
been introduced at various times, but records only of those that 
have been recovered or found established are given here. 
In point of time of the first capture or introduction twenty- 
six species have records extending back before 1902 and seven 
of these were collected by Blackburn during his residence in 
the Islands between 1876 and 1882. 
During the twelve-year period between 1902 and 1913, in- 
clusive, seventy-three species were first found or introduced so 
far as information is obtainable at this time; during the last 
ten years, 1914 to 1923, inclusive, forty-five additional species 
have been introduced or discovered for the first time. Although 
the record of first capture in the Islands of any particular 
species may be several to many years subsequent to its first 
establishment here, yet it is perhaps significant that a consider- 
ably smaller proportion of species were discovered during the 
last decade than during the preceding twelve-year period, the 
exact proportion being 4.5 species per year as compared with 
6.08 species per year for the preceding period. Possibly the 
greater proportion for the 1902-1913 period is due to the fact 
that some of the species had been established for many years 

Proc. Haw. Ent. Soc., V, No. 3, December, 1924. 
