26 o The American Naturalist. [March,: 
of Illinois,’’® from three specimens taken about a shed in Champaign 
county, Illinois. It has not since been discussed. 
This harvest spider is an outdoor species, occurring abundantly in 
fields and woods, although seldom found about barns and outhouses. 
During the past summer I have taken great numbers in Franklin 
county, Ohio, in the grass along the banks of a small creek, an 
among the driftwood left by the overflowing of the Olentangy River, 
The species becomes fully developed early in July; and the males and 
females are about equally abundant. Both sexes, when disturbed, 
emit from the coxal region a liquid having a peculiarly sharp, pungent 
odor. 
I placed a number of these harvest spiders in a large glass vivarium 
July roth, 1890. Two days afterward a pair were observed mating. 
They were standing on one of the vertical sides of the vivarium facing 
each other. The male kept waving his second pair of legs in the air; 
his body was somewhat higlter than that of his mate, being inclined 
downward and forward, while that of the latter was inclined upward 
in front. Similar observations were subsequently made on many other 
individuals. When alarmed both sexes have a habit of standing on 
six legs, rapidly vibrating the body, and moving the second legs in a 
partial transverse circle in the air. In confinement they eagerly devour 
plant-lice. 
The male Z. politum, is represented, natural size, at Fig. 1, Plate IX. 
At Fig. 2 are shown the more important structural details, magnified. — 
The body with the legs detached is represented at a; 4 represents the 
eye eminence, side view; c, the same, front view ; d, the palpus, side 
view; and e, the palpal claw. 
DESCRIPTION, = 
Mate.—Body, 5 mm. long; 2.8 mm. wide. Palpi, 3.5 mm. long. 
s: I., 25 mm. ; H., 51 mm.; IIL; 26 mm. ; IV., 36 mm. 
Dorsum smooth, finely granulated’; cleat reddish-brown, with no 
markings, except occasionally a faint indication (shown by a slightly 
darker shade) of the usual central dark marking. Eye eminence 
rather prominent, slightly constricted at base, black above, canaliculate, 
with a regular curved series of small, acute, black spines over each 
eye. Cheliceræ whitish, tips of claws black. Palpi slender, light 
brown, with femur and patella dusky ; finely pubescent, with a sub- 
obsolete tow of minute dark tubercles on the inner ventro-lateral sur- 
face of femur, and another row on the inner ventro-lateral surface of 
* Bull. Ill. St. Lab. Nat. Hist., Vol. III., pp. 89-90. 
