116 R. W. Dawson 



lected from May 10 to July 26. The great majority of 

 the specimens were taken at lights, but the following food 

 plant records were secured : elm 108, boxelder 64, Amaranthus 

 53, bluegrass, shepherd's purse and dandelion 51, willow 20, 

 blackberry 10, poplar 9, oak 7, Amorpha canescens 1. 



Since rugosa is doubtless the most destructive species in 

 Nebraska cornfields, a significant point is brought out by 

 the above data, namely that grasses and weeds, especially 

 Amaranthus, prove highly attractive to the adult beetles. 

 Since the females tend to lay their eggs close to the plants 

 upon which they feed, it becomes evident that a weedy 

 cornfield is much more liable to become infested than a 

 clean one. Had the fondness of rugosa for Amaranthus 

 been discovered earlier in the season during which most 

 of the collecting was done, much more striking figures than 

 the above could have been secured. The attractiveness of 

 boxelder for this species is also worthy of note. See in this 

 connection the food plant records under crassissima. 



Phyllophaga implicita Horn. 



1887. Lachnosterna implicita Horn, Trans. Amer. Ent. Soc, xiv, p. 

 262. 



Specimens examined: 57 6, 138 9, from Lincoln, Ne- 

 braska City, Weeping Water, South Bend, Ashland, Fre- 

 mont, Hooper, Dakota City, West Point, Norfolk, Osceola, 

 Exeter, Fairmont, Neligh, Grand Island, Red Cloud, and Wood 

 River, collected from May 9 to June 29. The following food 

 plant records are at hand : elm 36, poplar 33 and willow 8. 



Phyllophaga hirticula comosa Davis. 



1920. Phyllophaga hirticula comosa Davis, HI. Nat. Hist. Survey, 

 xii, pp. 337-338, pi. xlv. 



Specimens examined : 236 s , 127 9 , from Lincoln, 

 Ashland, Osceola and West Point. Food plant records 

 are: oak 28, blackberry 15, Amorpha canescens 12, and 

 elm 5. 



Phyllophaga ilicis Knoch. 



1801. Melolontha ilicis Knoch, Neue Beytrage zur Insectenkunde, 

 p. 75, pi. i, fig. 28. 



222 



