TIIK GENUS DENDROCTONUS. 



55 



J'rotln>r<i.i' 'Flic form of the pronotum corresponds to that of the 

 adult and its relative proportions are of some value in distinguishing 

 the species. The number and position of the frontal spines are 

 fairly constant in a species, although they vary in prominence with 



Suture'* 



tcvral suture 

 -Hypopkurite 8 



\ ^Tleurili'Epipleuritc 10 

 \lStcrnitetO 



l-n..:',^.Dcndroctonus valens: Abdomen of pupa, lateral and anal aspects, a, Prescutal lobe; b, scutal 

 lob; : c. sc-utellar lobe; d, postscutollar area; e, su^raanal lobe;/, paranal lobe; j,infraanal lobe; g^pleural 

 spines; r, caudal spine or epipleural s;jine of the 9th segment; t, lateral spines; /, dorsal spines; u, anal 

 opening; 10, tenth segment. (Original.) 



the age of the individual, as do other spines of the body, being much 

 less prominent in the older or preimaginal stage. 



Mesoihorax. The mesotergum is subrectangular and without 

 special characters, except, perhaps, in the number and arrangement 



