fee ee ree gee ees er ale cae 
1894.] Unusual Flights of the Grouse Locust. 485 
at the time of the flights, is appended below. It is interesting 
to note that-the preconceived idea of their course was con- 
firmed. His report indicated that the wind during the twenty 
four hours which brought in the Grouse Locusts on the night 
of the nineteenth inst. blew from : 
Southeast 2 Hours. 
South 3 Hours. 
Southwest 19 Hours. 
Total 24 Hours. 
The general direction pointing from the southwest. In the 
second flight the wind blew from: 
East 1 Hour. 
Southeast 18 Hours. 
South 4 Hours. 
Southwest 1 Hour. 
Total 24 Hours. 
Showing a mainly southeastern wind. 
Nothwithstanding a residence of many years in this local- 
ity, no other instance of unusual migration of this particular 
species has been observed, except during the preceding fall, 
1893, which was characterized also by flights in very small 
numbers, marking the first instance of their occurrence here. 
Of the natural breeding grounds of this species, but little is 
known in this section of the State of Illinois, beyond the fact 
of their existence along the Des Plains River at Riverside. 
In general terms, it may be inferred that the natural habitat is 
along the border of streams (J. H. Comstock’), about ponds 
(W.S. Blatchley’), in the vicinity of mud flats and low marshy 
places. The species is sub-aquatic in habit and widely distrib- 
uted. (Lawrence Bruner’). 
The predetermining causes of the singular flights noted above, 
may have been induced one way or another by the extreme 
dryness of the fall-seasons of 1892-3. Indeed it is safe to 
assume that these conditions played a direct part, as will be 
“Introduction to Entomology 
*From specimens so labeled in my collection. 
5MS. letter. 
