Superfamily Argiopo.J:^ 



large black spot in the middle; the front upper part is yellowish 

 gray. 



Tberidion unimaculatum (T. u-ni-mac-u-la'tum). — This also 

 is a small species, measuring about one twelfth inch in length. 

 It can usually be recognized by its white abdomen with a black 

 spot in the centre of the back, and a black ring around the base 

 of the spinnerets; sometimes the black spot is wanting, and the 

 ring about the spinnerets is incomplete. The cephalothorax is 

 orange with a black spot around the eyes; this extends back in a 

 point as far as the dorsal groove. 



Tberidion kentuckyense (T. ken-tuc-ky-en'se). — The cephalo- 

 thorax is yellow or brownish. The abdomen is white, very thickly 



Fig. 347. THERIDIOX FRONDEUM. VARIATION'S IN MARKINGS 



flecked with black. On the middle line of the abdomen above 

 there is a white band, which begins a short distance back from the 

 pedicel; the basal part of this band consists of three quadrangular 

 spots separated by narrow transverse lines, and bounded on each 

 side by a solid black patch; behind these spots the band is indis- 

 tinctly separated from the flecked sides. Length of body of 

 female one eighth inch, of male, barely cne tenth inch. The 

 species was described from Kentucky; but it occurs as far north 

 as Ithaca, N. Y. 



349 



