ABERRATIONS OF APPENDAGES IM COLEOPTERA. 127 



logical collection of the II. Zoological Institute of the University 

 of Vienna. The locality is unknown. 



The second case is in the right foot of the thh-d pair of legs 

 of Hijfjvocarahns variolosus (Fig. III.). The normal left tarsus is 

 composed of five joints, of which the proximal final joint with 

 the claws is longest ; the second is shorter hy nearly one-half 

 than the first; the third and fourth still shorter. All the joints 

 are cylindrical, slender, and narrower at the base, with spines at 

 the distal end. The basal, and partially also the next joint, 

 have longitudinal rows of soft pointed spines. While the femur 

 and tibia of the right foot correspond in the length and arrange- 

 ment, — with the exception of the stronger distal incrassation and 

 the longer inner ray of the tibia,— with the same parts of the 

 normal foot, the tarsus, on the contrary, is reduced by three 

 joints. The two first joints are longer and stronger than usual, 

 but they are less hairy than those of the left foot. The last 

 joint is quite flattened, heart-shaped, somewhat hollowed be- 

 neath, and divided into two flaps, which reminds one of an 

 uncus. The claws spring from the terminal border of one of 

 the flaps. 



This example came from the Plateau of Podolia. 



The recorded cases of supernumerary antennae in insects are 

 enumerated and considered in Bateson's ' Materials for the Study 

 of Variation'; Dr. Garbowski's individual appears to come in 

 Bateson's category of " extra antennae arising together." The 

 whole of the cases enumerated by Bateson under this category 

 are Lamellicornia. Dr. Garbowski's case is that of a Pectinicorn, 

 and is extremely interesting from the strong evidence it ofters — 

 as we shall hereafter explain — of the exact nature of the aberra- 

 tion, or variation, as Bateson prefers to call these departures 

 from the usual. It has been customary to look on similar cases 

 as "freaks of nature," and it has been one of the great merits 

 of Bateson's work that he has shown that these curious freaks 

 are evidently subject to law, for they display remarkable 

 symmetry, and are found to be in many respects nornial in their 

 abnormalities. Dr. Garbowski's case shows in a very interesting 

 manner the preservation of the usual number of joints in the 

 unnatural parts, and also their presentation of a new symmetry, 

 the organs introduced as supernumerary on the left side of the 

 body being not repetitions of left- sided organs, but a pair — 

 right-hand and left-hand. 



Asking the reader to refer to Fig. I., where the unusual 

 structures described are figured, it will be gathered that they are 

 placed on the left side of the body. Fig. II. represents the 

 natural antenna of the right side of the body, to which the 

 triple structure (Fig. I.) corresponds, or rather replaces, on the 



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