TNSF.CTS AFFF.CTlNr; PARK AND WOODLAND TRFES 



293 



as well as coniferous trees. IK' adils tiiat it has a wide (iistrihution in the 

 diversified forest region of tlie casicrn Tnitcd Stales, and adds that it is a 

 dangerous enemy to smooth i)arked trees whenever tlie\- l)ecome weakened, 

 injured or shaken by storms. 



Description. This beetle is more slender and a little smaller than 

 Xyloterus bivittatus Kirb)-. It varies in color 

 from light brown to almost black, is cylindric in shape, 

 about '8 inch long. The form of the antennal club, and 

 the sculpturing of the dorsal surface is shown in figure 55. 

 This species and the following have divided eyes, the 

 two divisions being some distance apart and connected 

 only by a narrow, dark strip, best seen in recently trans- 

 formed, light colored individuals. The galleries of this 

 insect may extend to some depth in the wood, lateral 

 burrows being given off at intervals and the brood 

 chambers occurring very close together, almost like 

 the cells of a honeybee. The walls of the i;^alleries 

 and brood chambers are a deep black as in the case of 

 allied species. The antennal structure is shown on plate 70, figure 4. 



Natural enemies. .\ predaceous beetle, C o 1 y d i u m 1 i n e o 1 a Say, 



has been recorded by Dr Hopkins as occurring in the burrows of this 



species. Another small beetle, Ips sanguinolentus Oliv., has been 



found Ijy Dr Hopkins in association with this species feeding on the sap of 



sugar maple. 



Bibliography 



1891 Schwartz, E. A. Ent. Soc. Wash. Proc. 2:77-78 



1893 Hopkins, A. D. W. Va. Agric. E.xp. Sta. Bui. 32, p. 176, 179, 210 



1897 Hubbard, H. G. U. S. Dep't .\gric. Div, Ent. Bui. 7, n. s. p. 28-29 



1899 Hopkins, A. D. \V. Va. .\gric. E.xp. Sta. Bui. 56, p. 444 



Xyloterus .sp. 

 A beetle belonging to this genus was met with by the writer at 

 Saranac Inn, Aug. 20, 1900, in white birch, where it was working in parti)- 

 dead wood. 



Fig. 55 Xyloterus po- 

 ll t US. (After Hub- 

 bard, U. S. Dep't Agric. 

 Div. Ent. Bui. 7, n. s. 



