-THE- 
State Agpiealtural College 
The Agricultural Experiment Station. 
BULLETIN NO. 19. 
OBSERVATIONS UPON 
INJURIOUS INSECTS, 
SEASON OF 1891. 
Approved by the Station Council , Alston Ellis , 
President. 
FORT COLLINS, COLORADO. 
MAY, 1802 . 
Bulletins are free to all residents of the State interested in Agri¬ 
culture in any of its branches, and to others as far as the edition will 
permit. Acknowledgment will he expected from all non-residents. 
Address the EXPERIMENT STATION, Fort Collins, Colorado. 
