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ZOOLOGY. 169 
On the 19th of November, which was an unusually fine day for 
the season, with the thermometer about sixty degrees and a light 
breeze from the south-east, I saw thousands of the same little 
Lycosas on the tops of fences around Providence running about 
and every few minutes raising themselves on tip-toe with their 
heads to the wind and turning their abdomens up in the air. 
They were very easily disturbed by the near approach of any object 
and would either run down the fences or lay themselves down so 
as to be hardly visible. I succeeded however, in bringing my lens 
hear enough to several of them while their abdomens were eleva- 
ted to see the thread passing from their spinnerets. It seemed to 
come from the small middle pair only, but the posterior pair were 
in constant motion, folding together over the middle ones and then 
spreading apart asif to help out the thread. Occasionally, one suc- 
ceeded in being blown from its position and carried along by the 
wind, sometimes horizontally, sometimes descending gradually as 
it went, but usually upward, sometimes at as high an angle as forty- 
five degrees from the horizon. The upper part of the thread pre- 
Served the direction which it had at starting while the lower end 
was drawn down in a curve by the weight of the spider. They 
were usually supported by one thread only, but in one instance I 
or three threads passing from the spinnerets at once. In another 
a single thread hung down from the spider while supported by an- 
other thread in the air. 
Most of the spiders hung by their spinnerets only and drew their 
legs close against their bodies. - Others extended their legs side- 
ways and one seemed climbing the thread as he went up. 
I first noticed the spiders ascending about 10 A. M., and they 
continued to do so until 4 P. M., though less frequently in the 
oon, 
: The threads spun in their unsuccessful attempts were streaming 
countless numbers from fences, trees, posts and telegraph wires, 
the dried grass in a pasture looked as if covered with one 
T cobweb. — J. H. EMERTON. 
Expryonic Larva or Burrerriies.— Under this head Mr. S. 
Scudder publishes an article in the “ Entomologist’s Monthly 
ine.” He points out the probable universality of the law 
Caterpillars of butterflies present greater structural differences 
“Ween the embryonic and adult stages of the same individual, 
