126 



THE ENTOMOLOGIST 



The Lucanus has the left antenna (Pig. I.) irebly branched 

 instead of single as in the type. There is a single normal 

 scape (sc) as in the right antenna (Fig. II.), but it is considerably 

 shorter, shows less curvature on the outer border, and the proxi- 

 mal portion is slightly thicker ; while it is less hairy on the club- 

 shaped farther part, which at the extremity is bare. The hyper- 

 trophy commences at the next joint — the pedicellus — 2 in our 



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^13.111 



figure, from which springs a branch turning outwards {a), the 

 pedicellus being continued as the main axis {h). The joint next 

 to the pedicellus (5) carries the third branch (c), which turns in- 

 wards in the direction of the insect's head. 



From the pedicellus to the end, the normal antenna consists 

 of eight joints, the first three of which are cylindrical ; the 

 remainder, being flattened, form the fan. In this aberration the 

 rounded shape of the pedicellus and the next joint is altered to 

 T-form by the growing out of the branches, and a deep trough- 

 like depression marks the borders of both offsets, so that a 

 transverse section would be biscuit-shaped instead of round. 

 These two joints are also much stronger and thicker than in the 

 normal antenna. 



The three joints intermediate between the fans and the pedi- 

 cellus do not show any noteworthy departure from the type on 

 either of the branches, and the fans, except in one instance, do 

 not exhibit more than ordinary divergences from the normal 

 form. The outermost branch of the left antenna has the tubercle 

 on the fifth joint very strong. The first two joints of the fan 

 are like those of the other branches and the right antenna, but 

 the third lamella is much more fully developed, and carries some 

 sharp barbs or spines. The two final joints also are very strong, 

 but what is in the highest degree remarkable, they form a solid 

 block, as it were, instead of being divided into two separate 

 segments. 



The lamellae of this thrice-branched left antenna appear to 

 have been originally turned downward, whereas the leaves of 

 the normal fan are directed toward the shoulder part. 



The specimen was found by Prof. Grobben in the entomo- 



