THE SOCIAL INSECTS 



allies are certain very peculiar wasps with a pale ghost-like 

 colour and enlarged eyes which are entirely nocturnal. Very 

 little is known as yet of the biology of any of these tropical 

 hornets. It may prove to be interesting, since there is already 

 a hint that in them the queen and worker are much less 

 different from one another than they are in the temperate 

 species. 



58 



