1890.] The Harvest Spiders of North America. 915 
present provisionally retained under Astrobunus, where also Say's 
grande may conveniently remain until the discovery of speci- 
mens enables it to be properly placed. 
At least four genera of the subfamily Phalangiinz occur in 
our fauna. Three of these have before been characterized, while 
the fourth is new. The first, and in number of species by far the 
largest, genus is Liobunum of C. Koch, which is characterized by 
having the palpal claw denticulate, and the maxillary lobes of the 
second pair of legs clavate in shape, enlarging from the base to 
the apex. Ten of our species, one of which is yet undescribed, 
belong to this genus, and two others—erzlipes and calcar—are 
provisionally retained in it. 
Closely allied to Liobunum, but easily distinguished from it, is 
a genus as yet uncharacterized, for which the.name Forbesium 
is proposed, in honor of Professor S. A. Forbes, Director of the 
Illinois State Laboratory of Natural History. Its characters are 
as follows: 
Teguments very soft. Anterior and lateral borders of the 
cephalothorax smooth. Eye-eminence’ distinct, entirely smooth, 
not canaliculate; separated from the anterior border by a space 
equal to its diameter. Lateral pores large, oval, marginal, with a 
deep oblique sinus behind each. ` Entire dorsal surface smooth, 
without tubercles or spines. Anal piece large, transversely oval. 
Mandibles short, similar in the two sexes, the first joint provided 
on the under side, near the base, with a distinct tooth. Palpi 
slender, rather long, the patella having a well-developed conical 
tubercle on its inner distal angle; claw denticulate. Maxillary 
lobes of second legs in the form of elongate triangles, as shown 
at Fig. 3, Plate XXX. Legs rather stout, and of only moderate 
length. 
Members of this genus are at once distinguished from those of 
Liobunum by the elongated triangular maxillary lobes of the 
second pair of feet, the conical projection on the palpal patella, 
and the perfectly smooth uncanaliculate eye-eminence. In 
Simon's synopsis of European genera it comes between Lio- 
bunum and Prosalpia, but it also differs materially from the 
latter. 
LI 
