Australian Pionidae 
377 
disto-dorsal end with 2 stout, blunt, slightly curved 
setae (Figure 50); legs II, III and IV with swimming 
setae arranged as follows: leg II: $, tibia 3, 
metatarsus 2-3; 9, tibia 3, metatarsus 3; leg III: 6, 
patella 2, tibia 5-6, metatarsus 2-3; 9, patella 2, 
tibia 4, metatarsus 4; leg IV: 6, patella 1, tibia 10- 
13; 9, patella 1, metatarsus 5-8, tarsus 5-7. 
Dimensions (pm), 6 (9): body 512-544/365-390 
(774-781/621-659); capitulum length 121-134 (135- 
141); genital field 52/142 (173-185/196-198). 
Pedipalp: trochanter 30-35 (33-34), femur 86-93 
(91-95), patella 41-49 (43-49), tibia 94-102 (104- 
111), tarsus 55-62 (64-68). Leg I: trochanter 64-69 
(62), femur 70-79 (58-67), patella 100-108 (87-95), 
tibia 153-164 (135-147), metatarsus 150-167 (140- 
147), tarsus 152-167 (142-149). Leg III: metatarsus 
111-113, tarsus 81-83. Leg IV: trochanter 100-113 
(96-99), femur 94-98 (84-95), patella 94-102 (108- 
122), tibia 101-117 (154-172), metatarsus 84-92 
(172-188), tarsus 211-221 (157-173). 
Remarks 
Acercella poorginup differs from A. falcipes by 
possessing two large setiferous tubercles on the 
pedipalpal tibia. Males further differ by the shape 
of the fourth leg and by the presence of 
sclerotization posterior to the genital field. 
At present, this species has been collected only in 
