20 



NEW YORK STATE MUSEUM 



A considerable variety of trees are subject to attack by May and 

 June beetles, the following list giving the trees in about the order 

 of their preference by the beetles, so far as southern Rensselaer 

 county is concerned: oak, ash, hickory, butternut or black walnut 

 (both are probably equally susceptible), elm and birch. The sugar 

 maple appears to be almost exempt from injury. Trees standing 

 by themselves in pastures or grasslands or on the edges of mowings 

 showed the most severe injury, and the damage was frequently con- 

 fined largely to the sides next the sodland. The feeding in the case 

 of large trees standing by themselves was most marked on the outer 

 portions and especially the tops of the trees, indicating that the 

 beetles as they emerged from the grass flew moderately high and 

 confined themselves largely to the more tender outer foliage. A 

 number of oaks, in particular, were so badly injured that practically 

 all the leaves were destroyed on the upper two-thirds of the branches, 

 while the remainder were almost uninjured. The concentration of 

 attack upon the tops of the trees is also noteworthy in woodlands. 

 This injury was so severe in a number of places that farmers were 

 of the opinion that the tops of some trees, at least, had died as a 

 result of the attack. This injury, so far as the agriculturist is con- 

 cerned, is much less important than the damage caused by the white 

 grubs. The amount of feeding on forest trees, as pointed out above, 

 is significant as an index for approximating the probable abundance 

 of white grubs the following season. 



Captures of Lachnosterna and associated species 



Lachnosterna 

 fusca Froh. 



fraterna Harr. . 



hirticula Knoch 



crenulata Froh. 

 arcuata Sm .... 

 micans Knoch . 



tristis Fabr .... 



dubia Sm 



barda Horn . 

 Ligyrus 



relictus Say . 

 Diplotaxis 



liberta Germ. 

 Serica 



scrica 111 ... . 



May 

 31 



June 

 2 



May 

 19 



34i 

 24? 

 315 

 13? 



3i 



19 



i7<5 



279 



4<5 



69 



20,3 



306 



159 



June 

 2 



279 



4$ 

 6? 



June 

 9 



BOSTON 

 CORNERS 



June 



BRONX- 



VILLE 



June 

 7, 10 



June 

 25 



115 





369 



69 



13 





' ' 03} 



l6i 



40? 



169 



2& 





1 i 





1 ' 





1 . 









90s 



10: 



1 .'. 



May 

 30 



10s 



79 



Totals 



137* 



133? 

 78<S 



40 V 



[l22i 



I 649 

 2i 



1 . 



1." 



1. 



*Si 



909 



2SS 



L i-h 



1 • 



'■;! 



Determinations by D. B. Young, confirmed by J. J. Davis. 



