INSECTS AFFECTING PARK AND WOODLAND TREES 



293 



as well as coniferous trees. He adds that it has a wide distribution in the 

 diversified forest region of the eastern United States, and adds that it is a 

 dangerous enemy to smooth harked trees whenever they become weakened, 

 injured or shaken l)y storms. 



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

 Xyloterus bi\ iltatus Kirby. It \arirs in color 

 from light brown to ahiio>t black, is cylindric in shape, 

 about Vg 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, d;irk strip, best seen in recent!)' trans- 

 formed, light colored individuals. The galleries of this 

 insect may e.xtend to some depth in the wood, lateral 

 burrows being given olf at intervals ami the brood 

 chambers occurring very close together, almost like 

 the cells of a honeybee. The walls of the galleries 

 and brood chambers are a deej) black as in the case of 

 allied species. 1 he 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 b\' Dr Ho|jkins as occurring in the burrows of this 



species. Another small beetle, Ips s a n g u i n o 1 e n t u s Oliv., has been 



found b\- Dr Hopkins in association with this species feeding on the sap of 



sugar maple. 



Bibliography 



1891 Schwartz, E. A. l-.nt. Soc. Wash, l'ro( . :: 77-7<S 



1893 Hopkins, A. D. \V. Va. Agric Kx]). Sta. Bui. ^2. p. 176, 179, 210 



1897 Hubbard, H. G. V. .S. Dep't Agric I)iv. Rnt. Bill. 7. n. s. p. 28-29 



1899 Hopkms, A. D. \V. Va. .\gric. Kxp. Sta. Bui. 56, p. 444 



Xyloterus sp. 

 A beetle belonging to this genus was met with b\' the writer at 

 Saranac Inn, Aug. 20, 1900, in white birch, where it was working in partly 

 dead wood. 



