Colour-groups of the Hawaiian Wasps, etc. 683 



On Maui, Molokai and Lanai, the fauna of each of which 

 is largely the same, we have three groups : — 



Group I. Identical with I on Oahu. 



0. nigripennis, Holmgr., purpurifcr, instabilis, ecostatus, 

 laevisulcatus, camelinus, brevicostatus, aprepes, lanaiensis, 

 konanus ; Nesodynerus eupteryx, paractias ; Pseudoptero- 

 cheilus congruus, Sra. ; Chelodynerus chelifer. 



Group II. Identical with IV on Oahu. 



0. molokaiensis, sociabilis, smithii, Dalla Torre, insulicola, 

 Blackb., nubicola, nivicola. 



Of the small shining-fuscous winged Group II : — 

 0. dubiusus (7). 

 O. threnodes (3). 

 Nesoprosopis assimtdans (2). 



Had it been a good season, of I there would have been many more 

 montanus, otherwise proportion as above. 



Of IV we should have found 0. xerophdus numerous locally and 

 Pseudopterocheilus relictus abundant, otherwise proportion as we 

 found above. 



Of II we should have also found Nesodynerus oblitus, local, not 

 general like the two above-named species of this group. ; 



The third day (May 10th, Palolo) we collected at 1200-1500 ft. 

 in forest. 



Of the curious clear-winged Oahu Group III, with dull red marks 

 we got only : — 



0. pseudochromns (16). 

 0. oahuensis (3). 



On a good day we might have found the closely allied 0. pseudo- 

 chromoides nearly as common as pseudochromus, with one or two 

 individuals each of the three rare species, O. eucharis, leiodemas, and 

 one other closely allied to eucharis, viz. homoeophanes. All these 

 occur in the very spot where we collected. 



Of Group I we got O. rudolphi (10), O. nigripenms (4), and 

 O. montanus (1) : also Hylocrabro tumidoventris (5), Xenocrabro 

 unicolor, Sm. (1). 



Group I was also represented by the Ichneumonid, Eckthromorpha 

 fuscator (macidipennis, Holmgr.) (5). 



The little endemic flycatcher, Ghasiempis, was fairly common, 

 young and old, and as tame as usual, but was clearly not paying any 

 attention to Hymenoptera. The chief interest to me of the whole 

 collection is the evidence as to what species are most abundant under 

 circumstances unfavourable for Hymenoptera. From long experience 

 I know exactly what one would, or might expect to get under 

 favourable circumstances. 



