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PROCEEDINGS OF THE NATIONAL MUSEUM 



(10 in females), A. lucasanus (10 in females), and A. longicaudatus (9 in 

 females, 13 in males). More than that, it presents an unbroken series 

 beginning with a number of legless rings not much greater than that 

 given for A. aequalis and ending with a number (15 +i) considerably 

 higher than those observed by Packard. No correlation with other 

 characters has been found. 



The other lots in this table are too small to enable us to make 

 conclusions of a similar degree of probability, though it is noteworthy 

 that they show a small average number of legless rings. The lot 

 from Kansas (column e), however, is interesting for the reason that 

 these specimens were sent from Packard and labeled by him A. 

 lucasanus. Thus we may regard them as paratypes of this species. 

 But they do not agree with his description, which claims 10 legless 

 rings in the female, 12 in the male. Here we fin^ only 9 such rings 

 in the female (not shown in table 6), 10.5 to 1 1.5 in the males, to which 

 must be added a male with spiral growth where there are 8 ordinary 

 rings and 2 spirals of 2 rounds each in the legless part of the 

 abdomen. This lack of agreement between the paratypes and the 

 description is significant, and it will be stressed when we find that 

 they do not agree with the description in another respect, either. 



I have seen many small lot's of Apus from North America, in which 

 the number of legless rings varied considerably. The material gives 



