1920] Hays-McColloch: Genitalia of Lachnosterna 



79 



TABLE I. 

 Period of Pupal DETERMiNAnox. 



Two striking cases are to be noted in the case of L. crassissima 

 when the pupal specific identification was made 22 and 25 days 

 before maturity in pupae, whose complete pupal stages were 29 

 and 30 days, respectively. The genital plates of the females 

 of L. rubiginosa are not very prominent even in the adults 

 which may account for the shorter period allowed for the 

 determination in the three females noted in the table. Other 

 species in which similar determinations were made include L. 

 implicata, L. crefiulata, L. prcetermissa, L. bipartita, L. corrosa, 

 and L. lanceolata. 



LITERATURE CITED. 



Glasgow, R. D.,1916. Phyllophaga Harris (Lachnosterna Hope) : Revision of the 



Synonymy, and One New Name. IH. State Lab. Nat. Hist. XI:365-379. 

 Horn, G. H., 1887. Revision of the Species of Lachnosterna of America JS'orth of 



Mexico. Trans. Amer. Ent. Soc, XIV:209-296. 1 plate. 

 Smith, J. B., 1889. Notes on the Species of Lachnosterna of Temperate North 



America with Descriptions of New Species. Proc. U. S. Nat. Mus., XI:481- 



523. 13 plates. 



