THE PACIFIC COAST TICK. 183 
recorded in the following table, were kept in an incubator during 
incubation and removed therefrom when hatching was complete. 
Fig. 15.—The Pacific Coast tick, Dermacentor occidentalis: Distribution in the United States. The large 
dots show localities where the species has been collected in our investigation. The small dots show 
the probable range of the tick. (Original.) 
The incubation period was reduced to 16 days in these two instances, 
during which time the mean temperature was about 90° F. 
