12 MELANDER AND BRUES. 



turbed the nest and remained close by. Its one fear is centered 

 in JMutilla. With thief-ants to rob its nests, parasites to prey on 

 its offspring, and in constant danger of being carried away bodily 

 by a wasp, itself numerous in individuals, it is remarkable that 

 Halictiis should have become a dominating type throughout such 

 a wide territory. 



This ends the list of the enemies of the bees as we have ob- 

 served them. Many other insects abound on the nesting-site, 

 but most of these, at least, are accidental visitors which neither 

 harm nor are harmed. Several beetles, spiders, flies and other 

 insects are included in this list which we give for reference in 

 conclusion. The smaller species live near the Halictus as they 

 would do anywhere, and not through preference, and the larger 

 ones in part are attracted to our observation ground to prey on 

 the smaller. These transients are such as a careful observation 

 of any limited field would bring to notice. They are the partici- 

 pants in life's continual struggle, each seriously and unwittingly 

 playing its part. 



PART TWO. 



A List of the Insects, Including the Accidental Visitors, 



Found About the Colonies of Halictus pruinosus, 



Robertson, at Woods Hole, Mass. 



July-August, 1902. 



Class ARACHNIDA. 

 Epeirid sp. 

 A minute larval spider was several times seen. It has no 

 connection with the Halictus. 



Bathyphantes formica Emerton. 

 Quite a number of specimens of this strange spider were ob- 

 served running in their zigzag course over the ground. Like 

 the last it is an accidental visitor, occurring on the colony during 

 its search for food. We are indebted to Mr. Nathan Banks for 

 the determination of this species. 



