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\Vol 13 
cages indicate a three-year cycle for L. submucida besides the two- 
year cycle discussed. 
The prepupal stage averaged from 6.6 days to 9 days for the different 
species, and the mean pupal stage varied from 21.9 days to 30.5 days. 
The averages of the two and three-year life cycles for the different 
species were 478.3 days and 807.7 days for L. crassissima, 475.9 days 
and 805.3 days for L. rubiginosa, 462 days and 827 days for L. futilis, 
461.3 and 813.9 days for L. rugosa, 411.7 and 750.7 days for L. implicata, 
and 845 days for L. vehemens. L. submucida pupates in the spring 
instead of the fall, and thus a two-year cycle is produced which nearly 
equals the period of development of the three-year individuals. The 
average period for the species was slightly over 711 days. 
A list of food plants of the adults, and situations apparently prefer¬ 
able to the grubs are given as is also a list of natural enemies found or 
reared during this study. 
LITERATURE CITED 
Davis, J. J. 
1915. Cages and Methods of Studying Underground Insects. Jour, of Econ. 
Ent., 8:135-139. 
1916. A Progress Report on White Grub Investigations. Jour, of Econ. Ent. 
9:261-281. 
1918. Common White Grubs. U. S. D. A. Farmers’ Bui. 940:1-28. 
1919. Contributions to a Knowledge of the Natural Enemies of Phyllophaga. 
Bui. Ill. Nat. Hist. Survey, 13: 53-138, 12 pi. 
Hayes, W. P. 1919. The Life-Cycle of Lachnosterna lanceolata Say. Jour, of 
Econ. Ent., 12:109-117. 
McColloch, J. W. 1917. A Method for the Study of Underground Insects. Jour, 
of Econ. Ent., 10:183-187. 
Sanders, J. G., and Fracker, S. B. 1916. Lachnosterna Records in Wisconsin. 
Jour, of Econ. Ent., 9: 253-261. 
Schwarz, E. A. 1891. Time of Flight in Lachnosterna. Proc. Ent. Soc., Wash., 
2:241-244. 
Smyth, E. G. 1916. Report of the South Coast Laboratory. Fourth Rept. 
Board Comm, of Agric., Porto Rico, pp. 45-50. 
President W. C. O’Kane: The next is “The Chinch Bug in 
Montana,” by J. R. Parker. 
THE CHINCH BUG IN MONTANA 
By J. R. Parker, Bozeman, Montana 
What is believed to be the first record of the occurrence of the chinch 
bug ( Blissus leucopterus Say) in Montana was obtained in 1911 when 
on May 23 a number of fourth instar chinch bugs were sent in from 
Glasgow, which is in the Missouri River Valley in the northeastern 
part of the state. Our observations concerning the chinch bug have 
been very interesting to us, not only because they concerned an insect 
