| 1894.] Unusual Flights of the Grouse Locust. 487 
swept as shown on the shaded portion of the map in the north 
western corner of Indiana, contributed specimens to the 
flights. While more or less speculative, this paper isa step 
toward establishing a knowledge of the migrations in the 
Grouse Locust, of which little has been said by previous wri- 
ters. 
ExPLANATION or Prats, No. XIII. 
Fig. 1, 2 and 3, Tettigidea lateralis Say, all natural size ; 
from nature. 
Fig. 1. Female with wings extended. 
Fig. 2. Seen from above. 
Fig. 3. Side view. 
Fig. 4. Map showing flights of T. lateralis in 1893. 
Clouded area indicating supposed habitat and 
section covered by the flights. 
[ec]. Chicago, local point of observation. 
Chicago, Feb., 1894. 
