520 SEVENTH REPORT OK THE FOREST, FISH AND GAME COMMISSION. 



nearly equidistant tubercles, the lower two being larger and farther apart. The 

 dorsal tubercle of the three is small and near the median line. There is also a very- 

 minute tubercle a little above and outside of the lowest 

 tubercle, but ordinarily it is not seen. The prothorax is 

 coarsely granulated and the wing covers are marked with 

 longitudinal rows of rather small punctures. The structural 

 details of the declivity are shown in figure 20. 



The white pupa of this species is about the same size 

 as the beetle. It tapers somewhat at the posterior extremity, 



FIG. 20. DECLIVITY OF 



TOMicus BALSAMEus. which latter bears a pair of slender, pointed processes. 



°'"'^"''^'" The partly curled grub or larva is almost 's of an inch 



long and has a brownish-yellow head with dark mouth parts. 



The operations of this species are best seen in a tree where the beetles have 

 just begun to enter. There will usually be found three to five branched 



^ 





, , .V |!-, ,,[J , fr^-—;"" '■■"•■•*™«. 



FIG. 21. CENTRAL CHAMBER AND EGG 

 GALLERIES OF TOMICUS B A LSAMEVS. 



ORUilNAL. 



FIG. 22. GALLERIES OF TOM ICVS RA LSA MEUS 



SllOWI.\'G CONDITION UNDER RIDDLED BARK. ORIGINAL. 



burrows here and there under the bark. A very small one is represented at figure 

 2 1. It will be seen tiiat there are five radiating adult galleries and also that each one 

 contains a number of minute notches, which are egg chambers. Each branch rep- 

 resents the work of a female and all have origin in a central chamber, near the 

 entrance of which the male stands guard. 



A more advanced stage of this insect's work is shown at plate 14, figure 3, which 

 represents the work of three females diverging from a common chamber. It \\ill 

 be seen that a number of the esjtjs have hatched and that the larvae have worked 



