86 THE ANIMAL KINGDOM. 



ANTENNAE OF SYRPHUS, OR OP BLOW-FLY. 

 (Musca Fomitoria.) 



Either of these may be taken to illustrate what is stated 

 by Dr. Hicks. If properly mounted they will be trans- 

 parent ; and on the third joint of each example will be seen 

 a multitude of transparent dots. These dots are perfora- 

 tions of the inner coat of the wall of the antenna, closed 

 externally by a very thin membrane. Behind this perfora- 

 tion is a sac which, when the antenna is crushed or broken 

 up, may be found floating about in the fluid. There are 

 about 17,000 of these sacs in each antenna. Besides these 

 simple sacs there are large spores, which lead into chambers 

 from which numerous little sacs or sacs or sacculi radiate. 

 These apertures are fringed with very minute hairs. There 

 are about eighty of these cavities on each side of the antennae. 

 They are filled with fluid, closed in from the outer air by a 

 very thin membrane, and to each little sac a nerve proceeds 

 from the large antennal nerve. 



This will be seen better in 



ANTENNA OF BEE. 



On the last three joints of these antennae, but only on one 

 side, we find these vesicles or sacs ; and if properly pre- 

 pared the great nerve may be distinctly seen, giving off 

 three bundles of finer nerves, each of these dots receiving 

 one. 



ANTENN/E OF ICHNEUMON. 



One species of Ichneumon will give singularly-shaped 

 perforations, in which the transparent membrane over-arches 

 and extends beyond the aperture, and gives it the appearance 

 of an inverted canoe. 



ANTENNAE OF ARGYNNIS. 



Argynnis, or Fritillary Butterfly, tawny coloured, with 

 black lines and spots on the upper wing, and silvery streaks 

 and spots on the under side of the hind wing. The antennae 

 possess small transparent dots and chambered cavities. 



