1004 The American Naturalist. [December, 
In the diagram on the following page I have reduced the 
lengths of the second pair of legs of the specimens from all the 
localities given above to straight lines, each line representing 
the precise length and the figures above it showing its meas- 
urement in millimetres. Where more than one specimen has 
been measured from a given locality the average is taken. It 
will be seen that the difference in the progressive lengthening 
from the north to the south is in no case greater than has been 
shown in Tables I and II to occur ina single locality. One 
can find no place where a line can be drawn separating the 
two forms. Considering in connection with this the fact that 
there are no structural or colorat’onal differences separating 
the two, it seems to me evident that, as already stated, we have Z 
here a single widely variable species. As the description of 
P. vittatum precedes that of P. dorsatum in the original publi- 
cation, the species should be known as Liobunum vittatum (Say) 343 
and the northern form as L. vittatum dorsatum (Say). It would 
apparently be well to refer to dorsatum the forms from those 
localities in which the average length of the second pair of 
legs in the males is less than 70 or possibly 75 mm. 
The above records have reference only to the males but a 
number of measurements of female specimens show that they 
vary in a similar manner. 
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LIFE-HISTORY. 
This species evidently passes the winter in the egg state a3 
it has never been taken during the winter or early sping 
months. The eggs of the northern form apparently dond 
hatch very early, probably not until May, and the young - 
grow slowly. Occasionally I have found a fully developed one 
during the latter part of June, but generally they do not 
become mature until July. My collections show two h 
grown specimens taken at Columbus, Ohio, July 30, 1888, and . 
another collected in the same locality July 16, 1888, which 18 — 
not fully developed. 
When very young these harvest-meu seem to prefer the 
shelter of the grasses, low herbage and rubbish piles, but 35 
they grow larger they are to be found in a great variety of sit- 
