THE GENUS DENDEOCTONUS. 



93 



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

 long hairs on sides and the punctures of anterior dorsal surface 

 coarser toward base and fine toward anterior margin ; ely tral rugosi- 

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

 declivity with longer and more numerous hairs. The West Virginia 

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

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

 elytra show the corresponding differences mentioned under the 

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



Fig. 65. — Dendroctonus frontalis: Old egg galleries 

 in living tree, with, surrounding callus of new 

 wood. (Original.) 



Fig. 56. — Dendroctonus frontalis: 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; 6, resinous vrood; 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.) 



northern form was worthy of specific 



distinction, 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 subdivisional 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 



