62 ENTOMOLOGICAL SOCIETY 



and Smith, in 1888, when the beetles occurred abundantly on 

 young trees, and could be easily collected, and stated that in 

 the summer of -1887 they were abundant in the Department 

 grounds, but occurred in numbers only on the largest trees 

 and on the topmost branches, thus confirming Prof. Riley's 

 experience. 



Mr. Fernow, replying to Prof. Riley, said that in Europe 

 they spread rapidly and ' ' became local everywhere, ' ' so that 

 all measures were ineffective on account of the enormous area 

 to be covered and the consequent cost. The only way was to 

 collect the imagines and burn them, the cost of which was met 

 by the Government. 



Prof. Riley admitted the impracticability of the various 

 means under the circumstances mentioned by Mr. Fernow. 



Mr. Mann thought that attracting to light would be 

 effective at times, and referred also to the damage to grass 

 lands in New England occasioned by the larvae. 



Mr. Schwarz thought that light, unless electric, would be of 

 little value. 



Mr. Schwarz presented the following paper : 



NOTE ON THE FOOD-HABITS OF XYLEBORUS TACHY- 

 GRAPHUS AND X. DISPAR. 



BY E. A. SCHWARZ. 



Last Sunday in May, while on an entomological excursion 

 in the hills along the Virginia side of the Potomac, Mr. Theo. 

 Pergande called my attention to some holes, evidently made 

 by a Scoly tid beetle, in young shoots of Liriodendron bushes. 

 These bushes had greatly suffered from a fire which last fall 

 had run through that part of the woods, but they were still 

 green, and would, in all probability, have recovered but for 

 the attacks of these Scolytids. Dead or nearly dry shoots, or 

 those which were less than 18 mm. in diameter, were not 

 attacked. The holes occurred singly, usually just beneath 

 the origin of a small twig, in some instances also just above 

 such places, and very rarely also remote from the base of a 

 twig. In a shoot of six or more feet in height sometimes four 

 or five holes were thus found, but often only two or a single one. 



Upon investigation these holes proved to be made by two 

 species of Scolytids, Xyleboms tachygraphus and X. dispar, 



