538 The American Naturalist. (June, 
Like other harvest-spiders this species also varies consider- 
ably in a given locality. It is so rare that it is difficult to get 
long series from one place so that I cannot tabulate at present 
these variations as fully as has been done for Phalangium cin- . 
ereum and Liobunum vittatum dorsatum. To indicate the vari- 
ation that sometimes occurs in a single state I may record that 
of two specimens from Dover, New Hampshire, measured 
since the above tables were prepared, the body of the male 
was 8 mm. long, and the second legs 63 mm., while the body 
of the female was 10 mm. long, and the second legs 50 mm. 
The second legs of this male specimen were 15.5 mm, longer 
than the one from Hanover recorded in the table. It should 
be stated however that Dover is distinctly within the region 
of the Alleghanian fauna, and Hanover is on the border 
between the Alleghanian and Canadian faunas. 
A study of all the specimens of my Forbesium hyemale now 
accessible leads to the conclusion that this is the immature 
stage of the southern form of L. ventricosum, just as Wood’s P. 
formosum is the immature stage of the northern form of this 
species. The dissection of specimens shows that they are not 
FIGURE 1.—Liobunum ventricosum. Immature: a, body; 4, eye eminence, side 
view: c, same, front view; æd, palpus; e, palpal claws; all magnified. 
sexually mature, and the dates of capture indicate that they 
disappear late in spring or early in summer at the time the 
TAMERICAN NATURALIST, Vol, XXVI, pp. 34-36. 
