THE ENTOMOLOGIST. 61 
not so numerous as in former years. In some seasons these 
migratory swarms of butterflies continue passing over to the 
south-east for three to five weeks, and must consist of 
millions upon millions of individuals, comprising many 
different species and genera. The beautiful tailed green- 
and-gilded day-flying moth (Urania Letlus) also join in this 
annual movement.”—P. 152. 
[It is curious that Mr. Belt, who has seen this beautiful 
butterfly, should accept the strange hypothesis that it isa 
moth. It is one of the moth-butterflies, or concealers 
(Celantes), in which the caterpillars hide themselves in a 
silken follicle, or cocoon, before changing into chrysalids. 
All the skippers, or Hesperide, belong to the same natural 
division — Edward Newman. | 
The Bull’s-horn Thorn.—* These thorns are hollow, and 
are tenanted by ants that make a small hole for their 
entrance and exit near one end of the thorn, and also 
burrow through the partition that separates the two horns, so 
that the one entrance serves for both. Here they rear their 
young; and in the wet season every one of the thorns is 
tenanted, and hundreds of ants are be seen running about, 
especially over the young leaves. If one of these be touched, 
or a branch shaken, the little ants (Pseudomyrma bicolor, 
Guer.) swarm out from the hollow thorns, and attack the 
ageressor with jaws and sting. They sting severely, raising a 
little white lump that does uot disappear in less than twenty- 
four hours.” —P. 218. 
Mimicry in a Spider.— On the leaves of the bushes there 
were many curious species of Buprestidae, and I struck these 
and other beetles off with my net as I rode along. After one 
such capture I observed what appeared to be one of the black 
stinging-ants on the net: it was a small spider that closely 
resembled an ant, and so perfect was the imitation that it was 
not until I killed it that I determined it was a spider, and that 
I need not be afraid of it stinging me. What added greatly 
to the resemblance was that, unlike other spiders, it held up 
its two fore legs like antenne, and moved them about just like 
an ant. Other species of spiders closely resemble stinging- 
ants: in all of them the body is drawn out long like an ant, 
and in some the maxillary palpi are lengthened and thickened, 
so as to resemble the head of one.” —P. 314. 
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