Xo. 6*2] 



SECONDARY SEXUAL CHARACTERS 



227 



two groups. One large male, labelled Uca pufjilator 

 (18286), has a pair of small female like claws. It comes 

 from Northampton Co., Va. (1894). It belongs to a dif- 

 ferent species from those described above. 



There are in this collection eight small female-like 

 crabs with the abdomen narrower than that of the nor- 

 mal female of the same size. All of them have both small 

 claws of the same size. In those with the narrowest ab- 



domen, the abdominal appendages are straighter and 

 less plumose than are those of the normal female of the 

 same size. This condition might be described either as 

 a juvenile, or as a less female-like condition, but not nec- 

 essarily more male-like. In size and shape the abdomens 

 of these crabs are like those of Fig. 5 A, B, C, D. In ad- 

 dition there is one small individual (17688) labelled 

 "pugilator," with the abdomen about half the width of 

 a normal female of the same size of the other species. 



There is also one further variation in the fiddler that 

 is different from the preceding ones. It is shown in Fig. 

 1 D. Mr. Gr. M. Gray found this male fiddler (Uca pugi- 

 latur), and with his permission I am able to figure it here. 

 It had two large claws, both like the claw of the normal 

 male. I find that Professor S. I. Smith, of New Haven, 



