1883. ] Entomology. 1175 
know why the insect thus appeared to be single brooded in the 
county, and purposed to make farther investigations in 1883. But 
in 1883 the potato-beetle almost failed to appear at all. For the 
first time, in my experience, since its arrival in the Middle States I 
saw the potatoes growing free and strong. Here and there a solitary 
specimen might be caught and a few nests of eggs and larve were 
destroyed, but there was no occasion to use poison at all. My 
neighbors were equally free, and during a journey to New York 
I observed. everywhere the same immunity. Letters also from 
my former residence in Ohio told me that the same condition 
prevailed there. I think, conscquently, we may accept it as true, 
that the potato crop has this season grown with less mischief 
from its great foe than at any time since the first invasion. 
wish, however, to call attention to the fact that the cause of 
this great diminution in its numbers must be sought, not during 
the past winter but in the preceding summer; yet that summer, 
1832, was marked by no abnormal climate or weather; it was 
neither very hot, cool, dry nor wet. On the other hand the sum- 
mer of 1881 was intensely hot anc dry, the thermometer at one 
time marking 100° for five successive days, yet all through that 
summer the beetles were excessively abundant and injurious, and 
several applications of poison were needed to keep them within 
due bounds. The first beetle crop of 1882 was also as abundant 
as usual, so that to the great heat and long drought of 1881 can- 
not be due the diminution here poiated out. 
tutes an abnormity of extreme rarity, the larva having the well- 
developed antennze and prolegs of the imago. The specimen is 
figured in the June number of the Æntomologist, 1883, p. 121, but 
the notes given by Mr. Jones are unfortunately rather scant. It 
Ever, quite peculiar. Only a few similar deformities are on 
Tur Nervo Ed. Brandt gives 
RVOUS System oF InsEcTs.—Professor Ed. : 
car, “sults of his studies of the nervous system of the larve of Dip- 
