i9 



REPORT ON THE ACULEATE HYMENOPTERA 



By Lieut.-Colonel C. T. BINGHAM 



OF the one hundred and seventy-four forms of Aculeate Hymenoptera 

 collected by the Expedition, eight proved to be previously undescribed. 

 Full diagnoses of these eight were published in the Appendix to Part II 

 of this work. Of the rest, nineteen forms only have not so far been reported 

 as occurring within the limits of British India, as defined in the volume on 

 Mammals in the Fauna of India series. That this should be so is not 

 surprising, as the collection was made in a country of which the configuration 

 and climate is very like that of Tenasserim. Again, the commoner forms 

 which are naturally the first to be procured have often a very wide range, and 

 although, in certain cases, these may be modified into local races ; such races 

 in the Hymenoptera seem to be rarely constant. Another factor which has to 

 be taken into consideration is that in certain widely distributed forms similar 

 variations seem frequently to occur throughout the limits of their range. 



No detailed analysis of the collection is attempted as our knowledge of 

 the Hymenopterous fauna of Siam and of Pahang, and the rest of the Malay 

 Peninsula to the south, is still very imperfect. 



TUBULIFERA 



CHRYSIDIDAE 

 STILBUM 



1. Stilbum cyanurum, var. splcndidum 



Chrysis splendida, Fabr. Syst. Ent., 1775, P- 357- 



Stilbum cyanurum, var. splendidum, Dalla Torre. Cat. Hym. vi, 1892, p. 40. 



Biserat, Jalor. October. 

 Spread over both hemispheres. 



'Apparently parasitic on several Hymenopterous species, which dug 

 galleries in the house-posts.' 



