A NEW AMBROSIA BEETLE FROM THE ADIRONDACKS; 



NOTES ON THE WORK OF XYLOTERINUS 



POLITUS SAY.* 



Carl J. Drake, 

 New York State College of Forestry. 



While collecting Ipidae in the vicinity of Cranberry Lake, 

 New York, in the western part of the Adirondacks during the 

 summer of 1919, the writer found numerous specimens of an 

 apparently nondescript Ambrosia-beetle belonging to the genus 

 Anisandrits Ferr. The insect was found breeding in large beech 

 and hard maple logs, cut from living trees during the previous 

 winter, and in large limbs, broken off during a windstorm, upon 

 the ground. The beech and maple logs had been skidded to a 

 roll- way and piled with other logs — yellow birch,- spruce and 

 hemlock — from two to five deep. The roll-way was near the 

 side of a large hill and fairly well protected from the sun by 

 surrounding trees. The logs were all in a moribund state, fairly 

 moist and offered a rather favorable breeding place for Ambrosia- 

 beetles and xylophagous insects. In fact they were all infested 

 by these insects, but the new species of Ambrosia-beetles was 

 found only in the beech and hard maple logs. 



In addition to the undescribed species of Anisandrus, the 

 beech and hard maple logs on the roll-way contained larvae, 

 pupce and adults of Afiisandrus obesus Lee, Xyloterinus politus 

 Say and Pterocyclon mali Fitch. The yellow birch logs were 

 infested by A. obesus, P. mali and Trypodendron betulcB Swaine. 

 The spruce and hemlock logs were inhabited by Trypodendron 

 bivittatum Kirby; two bark beetles, Polygraplnis rufipennis 

 Kirby and Dryoccetes picece Hopkins, were also breeding in 

 the spruce logs. 



In the egg-galleries of some of the above species were found 

 a number of rather interesting insects. A little anthocorid, 

 Anthocoris? sp. is a very common predatory insect upon both 

 bark and ambrosia beetles, especially in coniferous woods and 

 by far the most abundant in spruce. Many specimens, repre- 

 senting at least four instars, were noted under the scales of the 

 bark and in the burrows of both bark and ambrosia beetles in 



* Contribution from the Department of Entomology, The New York State 

 College of Forestry, Syracuse, New York. 



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