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 som.e 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 









ALBANY 



NASSAU 



BOSTON 

 CORNERS 



BRONX- 



VILLE 



ORIENT 



HOLLIS 







May 

 31 



June 

 2 



May 

 19 



June 

 2 



June 

 9 



June 



10 



June 

 7, 10 



June 

 25 



May 

 30 



Totals 



Lachnostema i 

 fusca Froh 



fraterna Harr. . . . 



hirticula Knoch . . 



crenulata Froh . . . 



arcuata Sm 



micans Knoch . . . 



tristisFabr 



dubia Sin 



barda Horn 



Ligyrus 



relictus Say 



Diplotaxis 



liberta Germ 



Serica 



.serica 111 



34^ 

 24? 

 3li 

 139 

 3i 

 IS 



ni 



279 



4<5 

 69 



2 



3 



I 



59 

 2 



17a 

 27? 



69 



7J 

 59 



2'$ 

 ""si 



29 



369 



IS 



"93^ 



409 



2i 



19 



I2i 



19 



I^ 



3 



2 



" " 69 



16$ 

 169 



'"255 

 909 

 i9i 

 129 



I 



22^ 



89 



lOi 



79 



I 



I37i 

 1339 



409 



I22i 



649 



2i 



19 



i2i 



19 

 25^ 



909 



2Si 

 149 



li 



4 

 4' 



I 



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



