INSECTS AFFECTING PARK AND WOODLAND TREES 355 



brown. It is a little shorter and more slender than Tomicus caco- 

 graphus Lee, the posterior, dorsal portion of the wing covers is more 

 hairy and the declivity is not so well marked. 

 There are three principal tubercles or chitinous 

 teeth. A minute dorsal one near the median 

 line and two larger, widely separated teeth on 

 the flattened area of the declivity. Between 

 the larger tubercles and farther from the median 



o 



line there are two minute chitinous points 

 marking the real margin of the declivity. The 

 prothorax is rather finely granulated and the 

 wing covers are marked with longitudinal rows 

 of rather fine punctures. The antennae are represented on plate 66, figure 

 5 and the middle tibia at figure y\b. 



The galleries of this species, judging from the few specimens collected 

 are more irregular than are those of some other members of the genus. 

 The central or entrance chamber is well marked and from this three or more 

 females may make their way in rather tortuous courses, sometimes parallel 

 with and sometimes nearly across the bark fibers. 



The eggs are deposited on both sides of the burrows and the grubs or 

 larvae excavate very irregular galleries for a distance of about an inch and 

 end their labors in a rather deep oval cell in the sapwood in which the grub 

 transforms to the beetle. 



Dr Fitch noticed this insect in his fourth report under the name of 

 Tomicus xylograph us Say and he comments as follows on the 

 boring habits of this species. He states that a long slender cylindric 

 gallery is formed which is excavated about equally in the outer surface of 

 the wood and in the inner layers of the bark. In some cases two, three or 

 even six galleries start from one point, running in opposite directions, but 

 always lengthwise with the tree or limb. Little notches are excavated at 

 intervals in the adult galleries while the work is in progress, one to four 

 eggs being placed in each notch. The gnawings of the beetles are left 



Fig. 72 Declivity of Tomicus c ae la- 

 ta s (author's illustration) 



