CANADIAN FOSSIL INSECTS. 91 



APPENDIX. 



Work op the prehistoeic scolttid, phloeosinus squalidens scudd. 



By a. D. Hopkins, Entomologist op the West Virginia 



Agricultural Experiment Station. (Plate xiv., xv.) 



The work of this prehistoric Scolytid* is of especial interest, and with 

 the large series of Scolytid work in our collection, and that recently col- 

 lected in the North-west, (mentioned ia Bulletin 21, n.s., Div. Ent., TJ. S. 

 Dept. Agriculture), I have been able to obtain some additional informa- 

 tion regarding the wood, the galleries and the generic position of the 

 beetle. 



A microscopic examination of the wood fibre in comparison with that 

 of Juniperus virginiana, Larix, Picea, Chamaecyparis, Thuja, Thuga, 

 Pseudotsuga, Sequoia and Abies, seems to warrant the conclusion that it 

 comes nearer to Thuja than to any of the other specimens with which it 

 was compared, yet not having compared it with Juni/perus communis, I 

 would hesitate to say that it is not this species, as determined by Dr. 

 Goodale. 



If, as seems quite certain, it is cedar, (either Juniper or Thuja), the 

 work must be that of Phloeosinus, and from a careful comparison with 

 the work of three existing species of this genus it is found to come very 

 close to Phloeosinus punctatus LeC, in Thuja plicata and Chamaecyparis 

 lawsoniana. (PI. xiv., Fig. 3.) 



The species of this genus seem to infest only the Cupresseae and Tax- 

 odieae. P. dentatus Say has long been known as the common enemy of 

 the eastern Junipers, and I have also found it in Thuja occidentalis at 

 Niagara Falls. I have also found P. punctatus to be a common enemy of 

 Thuja, Librocedrus and Chamaecyparis in California and Oregon ; P. cris- 

 tatus LeC, common in Sequoia sempervirens, and three apparently 

 undescribed species, one in Cupressus macrocarpa, one in Sequoia sem- 

 pervirens and the other in » Cryptominia sp., all in California. Two 

 European species in our collection from the late W. Eichhoff, P. auhei 

 and P. thujae, were both collected from Juniperus com,munis, and are 

 also recorded from Thuja. 



The "shark's tooth " form of the mating or nuptial chambers is the 

 characteristic normal form of that of all of the species so far as has been 

 observed. There is, however, considerable diflference in the size, form 

 and position of the primary, or egg, galleries. Those of P. dentatus (figs. 



* See a previous paper in this series, pp. 28-30. —S.H.S. 



