THE GENUS DENDROCTONUS. 



93 



ugose front, prothorax slightly narrow in front, with a few short and 

 .ong hairs on sides and the punctures of anterior dorsal surface 

 ijoarser toward base and fine toward anterior margin ; cly tral rugosi- 

 ties more acute; strial punctures coarser and more distinct; elytral 

 [declivity with longer and more numerous hairs. The West Virginia 

 iale differs from the typical North Carolina male type in the more 

 (shining front, with punctures more distinct, while the pronotum and 

 plytra show the corresponding differences mentioned under the 

 female individual 1. At one time it seemed to the writer that this 



lllEfi 



:-i V* 



FIG. 55. Dendroctonusfrontalis: Old egg galleries 

 in living tree, with surrounding callus of new 

 wood. (Original.) 



FIG. 56. Dendroctonusfrontalis: Egg gal- 

 lery in living tree marked on surface of 

 wood six years before block was cut 

 from tree, a, Mark of gallery on origi- 

 nal surface; b, resinous wood; c, surface 

 scar six years later; d, original surface 

 or 7-year-old annual layer of wood; e, 

 six subsequent annual layers of wood 

 formed over original wound. (Origi- 

 nal.) 



inorthern form was worthy of specific 



jdistinction, and the manuscript name 



:of D. pinicida was proposed for it, but 



it was later found that some southern 



examples showed the same, and even 



| greater, variations from the type. Therefore, since the species had 



disappeared from its northern range, it was decided that it would not 



be advisable to recognize it as specifically distinct. 



Pupa. In addition to the divisional and subdiyisional characters 

 the apices of the front and middle femora are armed with small 

 apical spines or granules. Abdominal tergites 1 to 6 without pleural 

 spines; 1, 2, and 3 without distinct dorsal and lateral spines; 4 to 6 

 with a pair of dorsal spines and one or two lateral ones ; 7 and 8 with 



