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 u}3on millions of individuals, comprising many 

 different species and genera. The beautiful tailed green- 

 and-gilded day-flying moth {Urania Leilus) 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 is a 

 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 Hesperidas, belong to the same natural 

 division. — Edward Netvtitan.] 



Tlie BulVs-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 ihey 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 hicolor, 

 Guer.) swarm out from the hollow thorns, and attack the 

 aggressor with jaws and sting. They sting severely, raising a 

 little white luni]) that does not 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 Buprestida;, 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 

 1 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 antenna), 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. 



