Williamson: Crayfish oi' Alle(;heny County 



13 



The chelEC are blue, becoming yellowish near the extreme tip, which 

 is red. The tubercles of the chela J are yellow. The antennae are 

 dark blue, with the alternating rings paler. The young mentioned 

 above as having been taken from their tunnel, varied in total length 

 from three-fourths to one and one-eighth inches. In color they were 

 bluish green, rarely pale and flesh colored. Faxon has recorded that 

 in the Indian Territory the Indians dall this species " red crayiish." 

 For this locality " blue crayfish " vvilll be an appropriate name. 



5. Cambancs propinquiis Oirard. iThis common species has been 

 taken in the Allegheny and Monongajhela Rivers and in many of the 

 small streams throughout the countyi In color it is variable, being 

 usually a clear brownish green, tinged with red and with a large red 

 blotch on the side of the carapace neajr the posterior edge. 



6. Cambanis ritsticiis Girard. Ohijo River, Neville Island. This 

 species is similar in color to profit nqnics, which species it very much 

 resembles. 



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