INSECTS AFFECTIXC PARK AND WOODLAND TREES 



377 



species. The excavation of the declivity is comparatively slight and is 

 marked on each sitle b)- the three small independent, nearly etjuidistant 

 tubercles, the lower two being larger and farther apart. TluTe is also a 

 very minute tubercle a little above and outside of the lowest tubercle but 

 ordinaril)- it is not seen. The dorsal tub(;rcle of the three is small and 

 near the median line. The prothorax is coarsely granulated and the wing 

 covers are marked with longitudinal rows of rather small punctures. The 

 general form ami structure of the antennae and tibia are shown on plate 66, 

 figure 4 antl at figure 90a. 



The white pupa of this species is about the same size as the beetle. 



Fig. 81 Central chamber and egg galler! 

 of Tomicus balsa mens (autho 

 illustration^ 



,,,^. ^^M3i..^ 



Fig. 82 Galleries of Tomicus b a 1 s a m e n s shov 

 ing condition under riddled bark (author 



It tapers somewhat at the posterior extremity, which latter bears a pair of 

 slender pointed processes. 



The partly curled grub or larva is almost 's inch long and has a 

 brownish )ellow head with dark mouth parts. 



Habits. The operations of this species are best seen in a tree which 

 the beetles have just entered. There will usually be found three to five 

 branch burrows here and there under the bark. A very small one is shown 

 on plate 62, and in figure 8 1 It will be seen that there are five radiating 



