1973] 
van Helsdingen — Linyphiid Spiders 
59 
from the figures and description it was correctly placed with vagina- 
tus and related species. 
To the descriptions of O. recurvatus given by the various authors 
I add the following remarks. 
Measurements (in mm). Male, total length 2. 7-3.0, length cephalo- 
thorax 1.25- 1.43, width 1.05- 1.20. Female, total length 2.7 (Ivie, 
1966: 2.8 mm), length cephalothorax 1.22 (1.3), width 1.05 (1.1). 
Ratio length to width of cephalothorax 0.85. PME large (0.09 
mm), separated by their diameter, same distance to AME which 
are barely smaller; lateral eyes of posterior and anterior rows con- 
tiguous. Chelicerae showing sexual dimorphism; c? with three “teeth” 
on dorsal margin: a basal, round tubercle with a more slender and 
sharp tooth just dorsally of its tip, a second tooth at some distance 
of the basal tubercle, and with a small tubercle at the end of the 
row; ventral row with two small teeth; 9 also with three dorsal 
“teeth”, ventral row with five small teeth (three ventral teeth ac- 
cording to Ivie, 1966). Stridulating files well-developed, ridges fine 
and close together. 
Legs long and slender, femur I 1.8- 1.9 times length cephalothorax, 
tibia I 20-23 ( c? ) or 18 (9) diams. of segment long. Tibia I longer 
than femur I, metatarsus as long as femur ( cf ) or slightly shorter 
(9). Femora I-III with a d-spine (on 0.5), femur I with an addi- 
tional l'-spine. All tibiae with 2 d-spines (position basalmost d- 
spine 0.25-0.35), tibia I also with one 1', one 1", and 2 v-spines, tibia 
II with one v-spine and a 1 "-spine; apical spines on segments hardly 
developed; all metatarsi with a single d-spine (position ca. 0.20 ). 
Tm I 0.15-0.20, metatarsus IV without trichobothrium. 
Male palp (Figs. 14-17). Characteristic is the meso-proximal 
hook-like projection of the cymbium, which points laterad (Fig. 16). 
The paracymbium lacks the isolated ventral hair which occurs in O. 
vaginatus (see Saaristo, 1972), and also in O. filicatus and rotundas; 
only a small tubercle present on this spot. Median apophysis (Fig. 
17, ma) well-developed, with slightly curved tip. Embolic section 
(Fig. 14) in general structure resembling vaginatus , but without 
lamella; ventro-lateral branch rounded-truncated, a slender, chiti- 
nous projection present between this branch and base of embolus, and 
a second, equally narrow, slightly larger, membraneous projection, 
arising from the dorsal surface of the radix. Embolus {e) short and 
squat, curved, with a sharp spermduct tooth, and well-protected by 
the embolic membrane {em) , which arises from the dorsal surface of 
the radix from the membraneous connection between median apophy- 
sis and radix (r). 
