125 INSECT MISCELLANIES. 



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7n, Eyes of Segestria perjida—sini n, Tegenaria domestica. 



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0, Eyes of Epcira diadema-'a.adp, Thoridion coronatum. 



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q. Eyes oi Latrodecta, 13 guttata — and r, Argijroneta aquatica. 



Three different sorts of eyes in insects have been 

 described by some authors, while others mention only 

 two, accounting the third sort only a peculiar coronet 

 {stemma, Linn., Fabr.) for ornamenting- the head. 

 It is not a little singular, however, that such men as 

 Linnaeus and Fabricius should have come to this 

 conclusion, with the works of Swammerdam and 

 Reaumur before them. The supposed coronet con- 

 sists most commonly of shining, transparent, smooth, 

 round points, usually three in number, placed on the 

 front or top of the head, for the most part in form of 

 a triangle. Swammerdam, in speaking of what he 

 calls " the three singular small eyes in a triangular 

 form between and below the larger eyes,'' in the head 

 of a male bee, says, " The first thing that I have 

 observed distinctly with regard to these little eyes, is 

 that they have a pellucid cornea, and secondly, that 

 in their cavity there likewise appears a coloured little 

 part, which may be called the uvea." He also traced 

 nerves from the upper or cranial ganglion running 

 towards each of those three eyes ; and adds, " these 

 are the reasons why I call them eyes, to which may 

 be added, that the eyes of spiders and scorpions are 



