INSECTS AFFECTING PARK AND WOODLAND TREES 359 



T. pini Say in the north. Dr J. B. Smith records the insect as being 

 present throughout New Jersey where it mines the green bark of dead or 

 dying pines and sptuces. Dr Hopkins states that it is very common in 

 West Virginia under partly living, dying and dead bark of living, dying 

 and dead standing and fallen pines and spruces. He states that it infests all 

 of the pines and the native and introduced spruces and that it is widely 

 distributed. 



Natural enemies. Dr A. D. Hopkins has reared several parasites from 

 this species. Spathius canadensis (?) Ashm. was bred by him from 

 cocoons found in the mines of this insect in white pine and S. pal 1 i du s 

 Ashm. was reared by him from cocoons occurring in the larval galleries 

 under the bark of scrub pine. Hister parallel us Say and H. 

 cylindricus Payk were taken by Dr Hopkins in the galleries of 

 this species. 



Bibliography 



1890 Packard, A. S. U. S. Ent. Com. 5th Rep't, p. 17 



1899 Hopkins, A. D. W. Va. Agric. Exp. Sta. Bui. 56, p. 284-344, 347, 422, 427, 

 428 and 445 



1903 Felt, E. P. For. Fish & Game Com. 7th Rep't, p. 485-86 



Minute spruce bark beetle 



Crypt argus atomus Lec. 



A minute, dark bark beetle about '/^ inch in length, makes short sinuous mines 

 in the bark of spruce and pine. 



This is one of our smallest bark borers and in many instances is proba- 

 bly overlooked on this account. According to Dr Hopkins it enters the 

 galleries of other bark beetles, from which it excavates numerous very 

 small, irregular channels through the inner bark of dying and dead black 

 and red spruce and white pine. The mine consists of a short, sinuous, pri- 

 mary gallery about x / 2 inch long from which arise on either side about 10 

 shorter secondary galleries. The beetles are sometimes extremely numer- 

 ous, many mines occurring within a square inch of surface. Dr Packard 

 records meeting larvae, pupae and beetles in great abundance at Brunswick 



