THE GENUS DENDBOCTONUS. 3 



HISTORICAL. 



The genus Dendroctonus was described by Dr. W. F. Erichson (1836) 

 > include (Bostrichus] micans^ Kug., (Scolytus} terebrans Oliv., 

 (Dcnnestes) piniperda L., (Hylesinus) minor Hartig, and (Hylesinus} 

 minimus Fab. " 



Eichhoff (1864) revised the genus and referred D. piniperda (L.) and 

 D. minor (Hartig) to Blastophagus Eichh. and later (1879) to MyelopJii- 

 lus Eichh., and D. minimus (Fab.) to Carphoborus Eichh., leaving D. 

 in leans (Kug.) as the type. 



Lacordaire (1868) referred to the synonymy and revised the descrip- 

 tion, including Dendroctonus junipiri Doeb. [ = PJilwosinus junipfri &> 

 (Doeb.)], D. valens Lee., and D. similis Lee. / 



Zimmerman (1868) divided the genus into three groups, placing 

 D. bifurcus (= Carphoborus bifurcus Eichh.) in the first, none in the 

 second, and D. terebrans (Oliv.) and D. frontalis Zimm. in the third 

 group. 



Le Conte (1868) revised the classification for the North American 

 species to include D. terebrans (Oliv.), Hylurgus obesus Mann., Hylurgus 

 rujiprnnis Kirby, D. frontalis Zimm., and two new species, D. punctatus 

 Lee., and D. simplex Lee. He here referred D. valens Lee. to D. tere- 

 brans (Oliv.), and D. similis Lee. to D. obesus (Mann.) . He recognized 

 t wo divisions, Division B represented by D. frontalis, and Division A 

 by the other five species. 



Chapuis (1869) included D. micans (Kug.), D. valens Lee., D. tere- 

 brans (Oliv.), D. obesus (Mann.), and added one new species, D. paral- 

 lelocollis Chap., but did not recognize D. frontalis Zimm. 



Le Conte (1876) included D. terebrans Lac. ( = Oliv.), D. similis 

 Lee., D. rujipennis (Kirby), D. punctatus Lee., D. simplex Lee., D. fron- 

 talis Zimm., and one new species, D. brevicomis Lee. He here 

 restored D. similis and omitted D. obesus. 



Dietz (1890) in his " Notes on the Species of Dendroctonus of 

 Boreal America," revised the classification, principally on the char- 

 acter of the epistoma, which he considered of primary importance 

 in separating the species. He included D. terebrans, with varieties 

 a, 6, c-j d, D. rufipennis, D. similis Lee., D. simplex Lee., D. frontalis, 

 added one new species, D. approximatus Dietz, and referred D. puncti- 

 collis Lee. to D. rufipennis (Kirby) and D. brevicomis Lee. to D. 

 frontalis Zimm. 



Blandford (1897) mentioned D. terebrans (Oliv.), D. parallelocollis 

 Chap., and an undescribed species from Texas probably D. terebrans 

 (Oliv.) and added one new species, D. adjunctus Blandf. 



The writer (Hopkins, 1899a) referred to D. terebrans, D. rufipennis 

 (Kirby), D. simplex Lee., and D. frontalis Zimm., with descriptions of 



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