184 Psyche [Sept.-Dee. 
Emerton examined three specimens, all males from widely sep- 
arated localities, Chatham, Massachusetts, Charleston, South 
Carolina, and Riverhead, Long Island, New York. The first 
two specimens are in the Emerton Collection and the last in the 
C. I. Crosby Collection at Ithaca. Within a few years, the 
species has been found in Alabama and Oklahoma. A careful 
examination shows several characters that were not mentioned 
in the Emerton description. 
Emertonella emertoni differs from the genus Euryopis by the 
very short thoracic groove, the two large ventral scuta, the 
numerous long stiff hairs on the dorsum. The two pairs of 
muscle spots on the dorsum are very conspicuous in this species. 
Family Argiopim; 
Genus Theridiosoma O. P. -Cambridge 1879 
Theridiosoma nelsoni spec. nov. 
Figure 4 
Female. Length, 1.5 mm., ceph. 0.6 mm., abd. 1.0 mm. 
Cephalothorax pale, head high; eyes about cover anterior 
margin, each eye heavily ringed with black, anterior row re- 
curved, eyes subequal, a.m.e. diurnal, touching, posterior row 
procurved, p.m.e. largest of the eight, angular, touching, lateral 
eyes subequal and touching; quadrangle higher than wide and 
wider behind than in front; clypeus about as high as quad- 
rangle; mandibles pale, vertical; sternum pale, dark about 
margins, not quite as wide as long, tip very broad and continued 
between the fourth coxae as a broad lobe, convex, with many 
dark hairs; abdomen pale, with a narrow transverse silvery 
band about the middle that is broken on median line, oval, base 
high and extending over cephalothorax, a few short hairs on 
dorsum, venter pale gray; legs short and varying little in length, 
pale with rows of dark hairs; epigynum , area convex and 
slightly protruding from the venter, anterior margin very long, 
with area below very narrow, a broad median septum with dark 
areas each side. 
Holotype, 9 Alabama; Alexander City, 1-14 August 1944, 
(Nelson). 
Theridiosoma nelsoni is much smaller than the two other 
species found in the United States. Theridiosoma radiosum 
McCook is found abundantly in the eastern part of the United 
