352 
Psyche 
[December 
tibia, 1.25 mm; metatarsus, 0.91 mm; tarsus, 0.47 mm. Second 
patella and tibia., 0.75 mm; third, 0.53 mm; fourth, 0.84 mm. 
Diagnosis. This species differs from Theridion volubile by the 
shape of the internal genitalia, the ducts of which loop less than those 
of Theridion volubile (Fig. 2). 
Record. One female paratype collected with holotype deposited in 
the Museum of Comparative Zoology. 
Theridion elli n.sp. 
Figures 5-10 
Holotype. Female from Antumapu, Santiago Province, Chile 18. 
I. 1973 (L. Alvarez) in the Museum of Comparative Zoology. The 
specific name is a noun in apposition, after a friend who has en- 
couraged me greatly in arachnology. 
Description. Carapace light brown, with a wide margin around 
the sides, turning into a thin black line at the clypeus. The eye 
region is dark (Fig. 7). The legs are generally spotted in mid and 
distal portions, the distal half of the tarsi being a light brown. The 
abdomen is variable in size and shape, but always has a white spot 
at each end of the genital groove and two smaller spots located be- 
tween the genital groove and the spinnerets (Fig. 8). The dorsal 
pattern of the abdomen consists of seven white spots stretching from 
near the pedicel to near the spinnerets. The first two are small, the 
third larger, and the subsequent spots become smaller towards the 
spinnerets. The spots are bordered in black which is sometimes a 
continuous border, sometimes in spots (Fig. 7). The male is similar. 
Both male and female were found under rocks and papers. Total 
length of female 2.13 mm. Carapace 0.88 mm long, 0.75 mm wide. 
First femur, 1.25 mm; patella and tibia, 1.41 mm; metatarsus, 1.00 
mm; tarsus, 0.53 mm. Second patella and tibia, 0.88 mm; third, 
O.59 mm; fourth, 0.91 mm. Total length of male 1.47 mm. Cara- 
pace 0.69 mm long, 0.63 mm wide. First femur, 1.31 mm; patella 
and tibia, 1.34 mm; metatarsus, 1.06 mm; tarsus, 0.56 mm. Second 
patella and tibia, 0.84 mm; third, 0.59 mm; fourth, 0.84 mm. 
The female type has a short, blind extra duct originating from the 
left seminal receptacle (Fig. 5). 
Diagnosis. This species can be differentiated from Theridion volu- 
bile and Theridion whitcombi by the epigynum (Fig. 6) in which 
the ducts are not visible (as in Theridion volubile ) and which dif- 
fers in shape from that of Theridion whitcombi. The ducts open in 
black spots of the depression (Figs. 5, 6). 
