ButieTin No. 21 1921 EnTomo.ocica. Serigs, No. 1 
BULLETIN 
of the 
LLOYD LIBRARY 
of 
BOTANY, PHARMACY anp 
MATERIA MEDICA 
| eh 0 & CG, LLOYD 
CINCINNATI, OHIO 
ENTOMOLOGICAL SERIES, No. 1 
The Biology of 
NORTH AMERICAN CADDIS 
FLY LARVAE 
By 
JOHN THOMAS LLOYD 
