126 INSECT MISCELLANIES. 



Co oOO , 



m O oo C) oooo n 



m, Eyes of Segestria perjidaantii n, Tegenaria domestica. 

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o, Eyes of Epcira diademaandip, Thoridion coronatum. 

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g, Eyes of Latrodecta, 13 guttata and r, Argyroneta 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 



