118 R. W. Dawson 



Polyphylla Harris 



The males of the species in this genus have the antennal 

 club enormously developed, often three or four times the 

 length of the antennal stalk, while the females have the 

 club of normal size. Specimens of the latter sex are 

 usually difficult to find and are relatively rare in collections. 



1842. Harris: Rept. Ins. Mass. Injurious to Vegetation, p. 30. 



1856. Le Conte: "Synopsis of the Melolonthidae of the United 

 States", Journ. Acad. Nat. Sci. Phila., (2) iii, pp. 225-288. 

 (Descriptive notes on 6 species). 



1881. Horn: "Revision of the Species of Polyphylla of the United 

 States", Trans. Amer. Ent. Soc, ix, pp. 73-76. (Descriptive 

 notes and table for 7 species). 



1914. Casey: "A Review of the Genus Thyce and of the North 

 American Species of Polyphylla", Memoirs on the Coleoptera, 

 V, pp. 306-354. (Descriptive table for 49 forms). 



SYNOPSIS OF THE SPECIES 



1. Upper surface with conspicuous, longitudinal stripes of densely 

 placed white scales, between the stripes the scales less closely 

 placed and more or less yellowish, surface color largely ob- 

 scured by the vestiture of scales decemlineata 



Upper surface obscurely striped, vestiture of scales not obscur- 

 ing the brown surface color homondi 



Polyphylla hamondi Le Conte. 



1856. Polyphylla hamondi Le Conte, Journ. Acad. Nat. Sci., Phila., 

 (2), iii, p. 228. 



Specimens examined : 10 ,j , from South Sioux City, 

 Lincoln, North Platte, Cams, Brown Co., Halsey and 

 Haigler, collected from July 1 to 22. Hamondi is also re- 

 corded from Illinois, Iowa and Kansas. 



Polyphylla decemlineata Say. 



1824. Melolontha decemlineata Say, Journ. Acad. Nat. Sci. Phila., 

 iii, p. 246. Le Conte ed., ii, p. 145. 



224 



