112 



JOURNAL OF ECONOMIC ENTOMOLOGY 



[Vol. 12 



The grubs were reared to maturity on germinating wheat grains in 

 ordinary salve boxes. The mortaHty was high. Over 700 boxes, each 

 with a single grub, were started in 1916. Of these only 9 reached the 

 semi-pupal stage, and 8 the pupal stage. A few 1916 grubs lived until 

 September 1, 1918, indicating a possible three-year hfe-cycle in some 

 cases. 



The possibility of a three-year life-cycle is also indicated by obser- 

 vations made in Harper County, Kansas, during the fall of 1918. In 

 the northern part of the county three distinct sizes of grubs were found 

 in almost equal numbers in nearly all infested fields. In the southern 

 part of the country only two sizes — first year and full grown — were 

 found. 



A B 



Fig. 5. Lachnosterna lanceolata adults: A — Male; B — Female. 



Pupa. — The pupa resembles any other pupa of the genus Lachno- 

 sterna. It is about 18 mm. long and 9 mm. wide. When freshly trans- 

 formed it is pure white in color. It gradually darkens until just before 

 emergence the color of the adult appears through the pupal skin in 

 many places. Table III shows the length of the pupal stage of sixteen 

 individuals collected as grubs at various times. 



