260 Annals Entomological Society of America [Vol. VIII, 
once reached that the breeding place was to the south-east of 
the instrument. But that same evening, the same place and 
but an hour later, the wind increased to 25 miles per hour, and 
as is shown in “‘B,”’ there were seven mosquitos caught on the 
north side of the east plane! If the conclusion based on the 
single specimen in ‘‘A’’ was correct, then the seven mosquitos 
under ‘‘B”’ indicate a breeding place to the north-east. The 
discrepancy is due to the fact that the inventor was close to 
his instrument, to the north-east of it, and mosquitos attracted 
QO- Quimby's Data. 
to him were blown against the glass sides due to the high 
velocity of the wind at that time. Mr. Quimby states in his. 
report that although mosquito activity was quite observable, 
it ceased entirely fifteen minutes after the wind increased to: 
twenty-five miles per hour. 
The remaining four charts refer to Gatun, and in this case 
the breeding place was definitely known to be to the west of 
the instrument. ‘‘C’”’ and ‘‘E”’ are evening tests, while ““D” 
and “‘F”’ are morning trials. In case ‘‘F”’ the wind was from 
