8o 
Psyche 
[June 
0.6 mm wide. First patella and tibia, 0.8 mm; second, 0.6 mm; 
third, 0.6 mm. Fourth femur, 0.8 mm; patella and tibia, 0.9 mm; 
metatarsus, 0.5 mm ; tarsus, 0.4 mm. 
Diagnosis. This species can be separated from S. questa by the 
internal female genitalia (Fig. 14) and by the dark marks on the 
anterior of the seminal receptacles in the epigynum. The dark marks 
are toward the lateral side of the seminal receptacles in S. melius 
(Fig. 15) while they are median in S. questa. 
Record. Two juvenile paratypes collected with type. 
Stemmops orsus sp. n. 
Figures 16-18 
Type. Female holotype from Forest Preserve, Panama Canal 
Zone, 28 Feb. 1958 (A. M. Chickering) in the Museum of Com- 
parative Zoology. The name is an arbitrary combination of letters. 
Description. Carapace yellow, dusky on sides and in center; eye 
region black. Sternum dusky around edges; legs yellow. Abdomen 
black with three pairs of white dorsal spots and a spot above spin- 
nerets (Fig. 16). Diameter of anterior median eyes almost half that 
of others. Anterior median eyes almost one diameter apart, touching 
laterals. Posterior median eyes one-quarter diameter apart, touching 
laterals. Total length 1.3 mm. Carapace 0.4 mm long; 0.4 mm 
wide. First patella and tibia, 0.5 mm; second, 0.4 mm; third, 0.4 mm. 
Fourth femur, 0.4 mm; patella and tibia, 0.6 mm; metatarsus, 0.2 
mm; tarsus, 0.3 mm. 
Diagnosis. Stemmops orsus differs from S. Una by having a trans- 
verse curved lip in the eyigynum (Fig. 18). It differs from S. 
ornatus t found in the eastern United States, by having the internal 
ducts coiled (Fig. 17). 
Records. Panama. Boquete, 1-8 Aug. 1950, 2 $ paratypes (A. M. 
Chickering) . 
Chrosiothes Simon 
Chrosiothes Simon, 1894, Histoire Naturelle des Araignees, 1: 521. Type 
species by original designation and monotypy: C. silvaticus Simon, 
1894. 
Theridiotis Levi, 1954, Trans. Amer. Micros. Soc., 73: 178. Type species by 
original designation. Dipoena jocosa Gertsch and Davis. 
Description. Abdomen suboval, subtriangular or with humps on 
each side, and often with characteristic coloration. Venter black, 
particularly anterior and above pedicel. Two minute setae replace 
colulus. Legs sometimes noticeably thick, first or fourth the longest. 
