42 JOURNAL OF EONOMIC ENTOMOLOGY [Vol. 10 



Sample No. Z-23 Z-24 



Material Lachnosterna Lachnosterna Corn 



grubs adults 



Moisture per cent 79.9 69.4 10.6 



Crude fat per cent 3.1 4.9 5.0 



Crude protein per cent ' 11.1 20.1 10.3 



Crude fiber per cent 1.6 3.7 2.2 



Crude ash per cent 2.0 1.6 1.5 



Nitrogen free extract per cent 2.3 0.3 70.4 



Comparing with other feeds the fat and protein contents of the grubs 

 compare favorably with these constituents in corn, as indicated above, 

 but the carbohydrates are deficient, indicating that feeding corn in 

 connection with pasturing hogs in grub-infested land or, better, 

 pasturing hogs in such land having a stand of corn, is desirable and a 

 good practice. 



To our knowledge only one chemical analysis of May-beetles has 

 been published and this analysis (of Melolontha vulgaris) which was 

 made by Stockhardt in the Academy of Forestry of Tharand in 1856 

 to determine their fertilizer value and published by Lunardoni ^ is 

 herewith given for comparison. 



Material ^ Fresh May-beetles Dried May-beetles 



Nitrogen 3.23 9.6 



Fat 3.80 11.5 



Other organic substances 24 . 77 74 . 7 



Mineral substances formed especially out 



of the components of phosphoric acid 



K3PO4, K2CO3, andC2P208) 1 .40 4.2 



Water 66.80 0.0 



Total 100.00, 100.00 



Reducing to similar terms, the above analysis, made over half a 



century ago, compares favorably with our analysis of May-beetles, as 

 follows : 



Material Lachnosterna Melolontha 



adults adults 



Nitrogen 3 .22^ 3 .23 



Fat 4.9 3.80 



Other organic substances 20 . 88 24 . 77 



Ash 1.6 1.40 



Water 69.4 66.80 



Total 100.00 100.00 



In the white grub infested areas there is an average of 106,680 grubs 

 per acre. The grubs during the fall of their destructive season aver- 



1 Agostino Lunardoni, Gli Insetti Nocivi. In La Scienza e la Pratica Dell' Agri- 

 coltura, vol. XI, 1899, pp. 119-157. 

 ^ The nitrogen content in the protein. 



