92 



THE SCOLYTID BEETLES. 



Zimm.," red disk ( = Carolinas) , which should stand as the type, and 

 the other two Libeled "Type 2" and ''Type 3," same locahty. 

 There are also two specimens, one labeled "Specimen 4, Lake Supe- 

 rior," and the other labeled ''Specimen 5, Va." Both of these agree 

 with the West Virginia form. In addition, there are three specimens 

 labeled with an orange disk ( = Georgia), one with light green disk 

 ( = Mddle States), all of which were doubtless before Le Conte when 

 he drew up his revised description. 



The series in the Horn collection, which was evidently before Doc- 

 tor Dietz when he drew up his revised description, includes but one 



Fig. 52.— D endrocto- ^ict- 52.— DeTidroctonus fron- Fig. 54. — Dendroctonus frontalis: 



nus frontalis: Ter- 

 mination of egg gal- 

 leries. (Original.) 



talis: Beginning of egg galler- 

 ies; a, In living bark; 6, in 

 dying bark; c, marked on 

 surface of wood (white area 

 represents normal appear- 

 ance of wood preserved by 

 resin). (Original.) 



Bark sho\nng, a, pitch tubes; 6, 

 entrance burrow; c, egg gallery; 

 d, ventilating burrow; e, pupal 

 cells; /, exit burrows; g, inner 

 bark; h, outer bark. (Original.) 



specimen labeled with red disk ( = Carolinas) . The specimens men- 

 tioned, together with two or three specimens in the United States 

 National Museum, were probably all that were in the larger collec- 

 tions of the country up to 1890. 



The form which in 1891 and 1892 extended northward from the 

 normal range of the species into Virginia and West Virginia is repre- 

 sented in the revision series by specimens labeled "Hopk. W. Va. 9 

 individual 1" and "Hopk. W. Va. $ mdividual 1." The West Vir- 

 ginia female differs from the typical South Carolina female in a more 



