134 
Psyche 
[March 
seems to belong in the group to which Erigone harrowsi Crosby and 
Bishop and Erigone dentimandibulata Keyserling belong. Its inde- 
pendent status as a new species is more or less clearly indicated by 
the body features and by the characters of the male palp. 
Records. The female is unknown and there are no male paratypes. 
Erigone aptuna sp. nov. 
Figures 4-9 
Holotype. The male holotype is from the Panama Canal Zone, 
Barra Colorado Island, August 15, 1954. The name of the species 
is an arbitrary combination of letters. 
Description. Total length 1.28 mm. Carapace 0.66 mm long; 
0.54 mm wide; about 0.29 mm tall shortly behind PME where it is 
tallest; no serrations observed along ventral margin; general features 
typical of the genus. Eyes : eight in two rows as usual ; viewed from 
above, anterior row definitely recurved, posterior rove slightly so. 
Ratio of eyes AME : ALE : PME : PLE = 4 : 6.5 : 6 : 6.5 
(slight irregularities noted). AME separated from one another 
only by a broad line and separated from ALE by a little more than 
their radius; separated from PME by nearly their diameter (Fig. 4). 
ALE and PLE contiguous to one another. PME separated from one 
another by about two-thirds of their diameter and from PLE by a 
little less than their radius. Central ocular quadrangle wider behind 
than in front in ratio of 7 : 4; wider behind than long in ratio of 
nearly 7 : 6. Clypeus somewhat extended forward ; with height, 
nearly equal to three times the diameter of AME. Chelicerae: ver- 
tical ; nearly parallel ; with teeth on anterior surface essentially as 
shown in Figure 5 but there appear to be fewer teeth on the left 
than on the right ; with teeth along the fang groove but exact number 
not determined because of fragility of holotype and lack of paratypes; 
no lateral striations observed. Maxillae: convergent; essentially typical 
of the genus except that conspicuous teeth appear to be absent and 
with only small cusps present. Lip: short; with swollen anterior 
border as usual in the genus. Sternum: convex; only a little longer 
than wide; extended between fourth coxae which are separated by 
nearly their width. Legs: 1=423 in order of length; with slender 
spines, bristles, hairs and trichobothria. Palp : trochanter with the 
usual ventral protuberance; femur with inconspicuous teeth and 
cusps (Fig. 6) ; patella short and with a short, sharply pointed 
apophysis (Fig. 7) ; tibia more or less typical of males of the genus; 
tarsus complicated and obscurely distinctive (Figs. 8-9). Abdomen: 
