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Pseudopterocheilus congrwus, Sm. . . . Molokai. 

 Odynerus peles, Perkins ..... Hawaii. 

 ,, heterochromias, Perkins . . . Hawaii. 



" Fossores (Crabronidae). 



Hylocrabro tumidoventris, Perkins . . 1 TT 



J . Hawaii, 



var. leucoi/nathus, Perkins . . J 



Xenocrabro atripennis, Perkins .... Hawaii. 



Nesocrabro rubrocaudatus, Blackb. and Cam. . Hawaii. 



"Anthophila (Prosopidae). 



Nesojyrosopis fuscipennis, Perkins . . . Oahu. 



,, caeruleipennis, Perkins . . . Molokai. 



,, pubescens, Perkins, typical . . Hawaii. 



„ setosifrons, Perkins . . . Hawaii, 



lx] 



"This large dominant Colour-group is not only exemplified 

 by Odynerus montanus, but also by four other species, each of 

 which represents a quite different Structure-group, and if 

 there was any good classification of the heterogeneous mass 

 forms called Odynerus, each would, in my opinion, repre- 

 sent a distinct genus. In addition to these and many other 

 species the group contains Nesodynerus rudolphi and others, 

 Pseudopterocheilus congruus and others, Chelodynerus cheli/er, 

 Perkins (not sent to you), various species of the three 

 Fossorial genera, and of the Anthophilous genus Nesojyrosopis 

 — consequently representatives of nearly all the existing 

 Hymenoptera of the Hawaiian islands. 



"Hawaii appears to be tending to total blackness, owing to 

 the predominance of this single Colour-group, the red of the 

 red forms becoming duller or diminished, the bands of the 

 banded forms more or less obsolete." 



Prof. Poulton said that he had but few comments to make 

 on Dr. Perkins's interesting and valuable paper, and, in fact, 

 he felt considerable diffidence in making any suggestions at 



into Group E, sent for exhibition (Group E = I of Molokai, Oahu, etc.). 

 The particular specimen of 0. molokaiensis exhibited was captured in Maui 

 (Wailuku, Sept. 1901), the species having reached that island, Dr. Perkins 

 considers, about 1896.— E. B. P. 



a 7 



