34 





The American Naturalist. 





[Jan 



light brown, with , 



uany 



les. Remaining joints of legs 



cum. 



irnon br 



more or less annul 



:.ited 



with deeper and lighter shades ; angular 



with 



longitu 





Iheath of genital organ subcyli 

















ned upward at nearly a right angle, and te 





ating w; 













Female (Fig. : 



-• f, 



*).— Body, 6-9 mm. long; 4-5 mm. wid< 



:. F 



'alpi 4 



long. Legs : 1,2 





mm. ; II, 39-52 mm ; III, 22-29 mm. ; IV, 



30-37 mm. 







: as follows : Body larger, rounder. Dorsum 



da.ker : 







urking more distinct. Tubercles on dorsu 























Le^s with ainulati 





»Dre distinct; trochanters without tubercles; 



; spi. 





less prominent at 



li ™ 



i tibia obsolete. Narrow quadrangular bi 





1 ucl e 



Vaeiation. 



Like most members of its family the Ash-gray Harvest- 

 spider varies greatly in the size of its body ami the length of 

 its legs. To determine the extent of this variation, I collected 

 at Columbus, Ohio, about the middle of September, 1889, a 

 large number of adult specimens of both sexes, which were 

 carefully measured by my assistant, Miss Freda Detmers. The 

 results are shown in the tables on pages 35 and 36. 



These tables show a remarkable amount of variation on both 

 sides of the line of average. It will be noted that the differ- 

 ence between the greatest and least measurements averages 

 about one-third the entire length of the latter in both sexes; 

 and that only two cases occur in each table where the leg 

 measurements are identical, viz: Xos. 5 and 13, and 7 and 

 25 in Table I; and 16 and 20, and 23 and 25 in Table II. 



Dr. Wood states tlu 



northern New York. 



the following counties 



Illinois: Champaii 



Iowa: Storv (('. IV 



