INTRODUCTION Ixxv 



which also destroys larvae of Imported longicorn beetles and apparently those of other 

 families, is now known elsewhere, and the latter is a parasite of introduced Tineid 

 moths and known also from Fiji. 



To return now to the families that are represented by positively or probably 

 endemic species, we shall see that though the number of species is frequently large in 

 these, proportionately to the size of the islands, the number of genera represented is 

 very small. 



The Prosopidae are represented by 53 described species oi on&'gtmi's, Nesoprosopis. 

 which is not endemic, since an European' species agrees with the Hawaiian series in its 

 essential characters. 



The Crabronidae contain five genera closely related, as it appears to me, to one 

 another, but sufficiently distinct from foreign forms to be separated generically. The 

 European Crabro vagus is related to the least remarkable of the Hawaiian species. 

 None of the other diverse groups of Crabronidae have any representatives in our fauna. 

 There are 18 Hawaiian species. 



The Pemphredonidae have two well-marked genera in the sub-family Pseninae. 

 They are intimately related to one another and no doubt of common origin and are 

 allies of the widely spread genus Miiiicsa. There are 10 species, equally divided 

 between the two genera. 



The Eumenidae are represented by 104 species, included in the almost ubiquitous 

 genus Odyncrus together with three other genera that are endemic. These three 

 genera, however, are intimately related to some of the island species assigned to 

 Odynerus itself and are evidently local derivatives from the same stock, produced 

 within the islands. Those assigned to Odynerus, on the other hand, are, I now think, 

 clearly descendants of two quite distinct forms of original immigrants, one of which 

 gave rise to the bulk of the species, as well as to the endemic genera that I have 

 separated from these, while the other has produced but four distinct species, as at 

 present discovered, and its origin was Asiatic. 



The Bethylidae (incl. Dryinidae) have four genera represented, none of these being- 

 endemic. Scleroderma has 10, Sierola nine, Pseudogonatopus two, and Echthrodelphax 

 a single species. The latter may not impossibly prove to be specifically apodemic, as 

 well as generically. It is of Australian origin, as also is Sierola. 



The Poneridae are represented by one endemic species of Ponera, which exhibits 

 much variability, the variation being apparently due to local influences to some extent. 



The Proctotrypidae have but a single species of Proctotrypes, parasitic on endemic 

 Diptera in the forests. It is said to be allied to a North American species. 



The Diapriidae are represented by three described genera, one of which is not 

 endemic and the other two appear to me to be derivatives of the latter. One in tact 



^ A species, N. chiiiemis, is now known from China. 



k2 



