202 The Ohio Journal of Science [Vol. XXI, No. 6, 



spruce logs, which were badly infested by Ipidae, during June, 

 July and August of 1919 and 1920. No adults were found at all 

 during the entire summer, but as large nymphs were in the 

 majority during September, the adults probably emerge in 

 late fall. Only very young nymphs were found in the early 

 part of the summer. It is quite evident that the entire life 

 history is passed in the burrows of Ipids and beneath the scale 

 of the bark. At Cranberry Lake there is but a single generation 

 a year. Numerous large nymphs were placed in breeding cages 

 at Syracuse, but they died just before the last moult or adult 

 state was reached. During the summer the nymphs were 

 especially common in the burrows of Poly graphics rujipennis, 

 Dryocoetes picecB, D. americana Orthotomiciis ccelatus and occa- 

 sionally in tunnels of Trypodendron bivittatum. A few nymphs 

 have also been collected in the burrows, of Ips pini, Pityogenes 

 hopki7isi, Dryoccetes betulce, Trypodendron betulce, Anisandrus 

 obesus and Xyloterinus politus. Other associated forms, includ- 

 ing scavengers, sap-feeders, predators, etc., were as follows: 

 In the burrows of Anisandrus obesus Lee. (beech and hard 

 maple) ; 



Molamba lunata Lee. 



Rhizophagus dimidiatus Mann. 



Cerylon castaneum Say. 



Colydium lineola Say. 

 In the burrows of Anisandrus swainei n. sp. 



Euperea ovata Horn? 

 In the burrows of Xyloterinus politus Say and Pterocylon 

 mali Fitch (in beech and Maple) ; 



Anistoma sp. 



Siagonium piinctatiim Lee. 



Rhizaphagus bipunctatus Say. 



Homalium sp. ? 



Siagonum punctatum Lee. 



Lcemophcens biguttatus Say. 



Cerylon castaneus Say. 



Rhizophagus remotus Say. 



Another anthocorid, Anthocoris borealis Dall., is occasionally 

 taken on coniferous trees, but it is more common on deciduous 

 trees, especially willow. A few specimens have been observed 

 beneath the scales of the bark and in the burrows of bark 



