A Centipede with an Abnormal Antenna. 



By 



Masanosuke Takesita, 



Zoological Institute, Sci. Coll., Tokyo. 



Among the collection of myriapods in my possession, there exists 

 an interesting specimen of the centjpede, Otocryptops rubiginosus Koch, 

 in which the left antenna is in anomalous development as shown in 

 the camera drawing reproduced in this paper. No abnormality exists 

 in other parts of the body. The specimen was collected on April 24, 

 1916, in my garden in Tokyo. It is dark yellowish brown in general 

 color and of a medium size, measuring 35 mm. in length of body. 



Normally developed antenna of this species is setaceus and pubes- 

 cent ; it is of a similar color as, though somewhat lighter than, the 

 body. It consists of seventeen segments or annulets, of which the one 

 at base is the broadest, while the rest grow successively narrower 

 towards the distal end. The intersegmental ring-grooves in relation to 

 the eight proximal annulets are not so markedly pronounced as they 

 are in the more distal parts of antenna. The last four or five annulets 

 are catogenous in their way of being joined together. 



Now in the specimen under consideration, the right antenna ex- 

 hibits quite normal development, while the left is composed of only 

 four segments. This is similarly colored as the other normal antenna, 

 and both are equally pubescent. The first annulet in the abnormal 

 antenna takes a nearly normal shape, but is decidedly larger than the 

 corresponding annulet of the right antenna. Of the remaining three annu- 

 lets, which are all quite abnormal, the second is a little narrower but 

 much longer than the first. It is almost as long as the second and 



