( xvi ) 



recorded, from time to time. Prof. Bateson's well-known 

 work, " Material for the Study of Variation," reviewed all 

 the scattered information on tlie subject and added a mass of 

 fresli material which is now — I believe — preserved in the 

 Museum of the Royal College of Surgeons. The phenomenon 

 of dichotomy and multiplication of organs appears somewhat 

 frequently in the Order Coleopfera, and instances have been 

 noted in several other Orders. But I cannot recollect having 



Anterior limb of Coccid {Monophlebus crawfordi) showing dichotomy. 



X 65. 



seen or read of any such aberration in the Family Coccidae, 

 and I am inclined to believe that the instance here described 

 is unique. 



The accompanying figure shows a case of dichotomy of the 

 anterior limb of the large Australian Coccid — Monophlebus 

 crawfordi, Maskell. The duplication, in this example, appears 

 to arise from the trochanter. The supplementary limb, 

 though somewhat malformed, is fully developed and sliows the 

 normal number of parts. The tarsus, tibia and femur arq 



