50 
Mr. Kellogg advances the theory that when the odors can not be made 
out in the case of certain androconia the fact is probably due to the j 
limitations of the hnman ear! 
DEATH WEB OF YOUNG TROUT. 
Many years ago one of the numbers of the American Entomologist 
contained an article under this caption, in which attention was called 
to the destructioo of young trout in fish hatcheries by the larval web 
of Simulium (the "black fly")- ^ ur attention has only recently been 
called again to this matter by the Hon. Marshall McDonald, IT. S. Com- 
missioner of Fisheries, who has sent us a report from Mr. E. M. Bobin- 
son, superintendent of the fish hatcheries at Green Lake, Me., stating 
that at the time when the young salmon were hatching in the troughs, 
the larvae of Simulium appeared in large numbers. Any considerable 
number, as Mr. Eobinson wrote, in a hatching trough will, in one night, 
fill it almost entirely full of fine web. The web sometimes gets around 
the neck of one of the fry and chokes it to death. The Simulium larvae 
were accompanied by specimens of one of their great enemies of the 
genus Hydropsyche, and these Hydropsyche larvae were reported by Mr. 
Eobinson to feed upon dead fish, after they had been killed by the web 
of the Simulium. This seems to be a perversion of habit on the part 
of the Hydropsyche, and a most unfortunate one, as it diverted them 
from their normal and beneficial habit of preying upon the Simulium. 
Damage of this kind is only possible when the fish are just hatching, 
as a few weeks later the fish themselves feed upon the Simulium larvae 
and practically turn the tables. 
POLLINIA COSINE IN CALIFORNIA. 
In the Annual Eeport of the Department for 1892, Prof. Eiley an- 
nounced the appearance of a peculiar olive scale, well known in south 
Europe, upon a few olive trees in the vicinity of Los Angeles. This 
scale had been described by Prof. Targioni-Tozzetti as Pollinia costce, 
and as it is a very difficult one to destroy, its immediate eradication by 
burning was urged. We learn from the Eural Californian of May, 
1894, that, although the insect was supposed to have been destroyed, it 
has recently been discovered by the State quarantine officer, Mr. Alex- 
ander Craw. Fortunately it seems to have spread but little during the 
past two years, and heroic measures have been taken to stamp it out. 
Orcus chalybeus was reported to have been seen devouring this scale, 
but it was stated later that this was a mistake. 
A PREDICTION VERIFIED. 
A person signing the initials "J. 0. H. S." wrote from Sedgwick 
County, Kans., in 1882 to the Prairie Farmer in regard to rainfall and 
the chinch bug, showing from records whicli he had kept that at the 
end of six and seven year periods comes a severe drought with chinch 
