. An annotated list of the important North American forest insects. Forest insects. FiGUiiE 17.—Larva or yrub of a roundlieaded borer, Megacyllene antcnnatus White. Enlarged 3 diameters The powder-post beetle that is most destructive flies in the vicin- ity of AVashington, D. C, mainly from the early part of May to the middle of June, the maximum emergence taking place betweefi May 30 and June 8. Occasionally a partial second generation occurs, and a few beetles emerge during the warm days of late summer and fall and may be seen in flight from August 15 until cold weather comes. The nniin broo
. An annotated list of the important North American forest insects. Forest insects. FiGUiiE 17.—Larva or yrub of a roundlieaded borer, Megacyllene antcnnatus White. Enlarged 3 diameters The powder-post beetle that is most destructive flies in the vicin- ity of AVashington, D. C, mainly from the early part of May to the middle of June, the maximum emergence taking place betweefi May 30 and June 8. Occasionally a partial second generation occurs, and a few beetles emerge during the warm days of late summer and fall and may be seen in flight from August 15 until cold weather comes. The nniin brood survive the winter in the mature larval stage and do not emerge as beetles until the following May. Seasonal differences aflect the earliness or lateness of the flight period. Dur- ing the hottest part of the summer it is possible for the beetles to develop from eggs in from 60 to 70 days. The beetles of the roundheaded borers usually fly only a few weeks during the spring and summer months, in the vicinity of Washing- ton, D. C, where they have only one generation a year. Farther. FiGUUE 18.—Larval mining uf a roundheaded borer, Cal- lidium antennatum, which causes the bark to tall off: A. outside of the piece; B, inner miues of the borer, (^ne-lialf natural size. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Craighead, Frank C. (Frank Cooper), 1890-; Perry, George S; Snyder, Thomas Elliott, b. 1885; Hopkins, A. D. (Andrew Delmar), 1857-1948; MacAloney, Harvey John, 1896-; Graham, Samuel Alexander, 1891-; Peirson, Henry Byron, 1894-; Herrick, Glenn W. (Glenn Washington), 1870-1965; Britton, Wilton Everett, 1868-1939; Tanaka, T; Sanders, J. G; Howard, L. O. (Leland Ossian), 1857-1950; Chittenden, F. H. (Frank Hurlbut), 1858-1929; St. George, R. A. (Raymond Alexander), b. 1894; Beal, J. A; Middleton,
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Keywords: ., bookauthorhopkinsadandrewdelmar, bookcentury1900, bookdecade1900
