A new Stygiochiropus 
449 
Diagnosis 
Differing from all other species of the genus in 
the long process arising from the middle of the 
femorite. 
Description 
Male 
Length, 13 mm; width at seventh metazonite, 1.0 
mm; third antennal article 0.63 mm long. 
Nonsexual characters virtually identical to those 
described and illustrated for Stygiochiropus 
communis (Humphreys and Shear 1993). 
Gonopods large and robust for size of animal, in 
situ with coxae and prefemora in contact, femorite 
then curves laterally and finally mesally so tips of 
gonopods touch in midline, femoral processes 
extending mesally and crossing. Prefemur short, 
less than 1/3 length of coxa, heavily setose, 
moderately curved. Prefemur/acropodite 
articulation well-formed, constricted. Femorite 
basally narrow, expanding to maximum width at 
base of median femorite process f; process long, 
thin, evenly curved, with acute tip. Distal femoral 
process d on lateral side subtending articulation of 
solenomerite, Solenomerite s broad, laminate, with 
marginal teeth. Process a as long as. solenomerite, 
evenly tapering. Process b sickle-shaped, subequal 
to solenomerite. Process c short, acute. 
Cuticle brittle, colourless. 
Female 
Length, 15 mm; width at seventh metazonite, 
1.10 mm; nonsexual structures otherwise as in 
male. 
ACKNOWLEDGEMENTS 
The irrigation system was installed, maintained, 
and removed by Darren Brooks and the water 
provided courtesy of the Western Australian Water 
Authority. We thank R.L. Hoffman and D.G. Black 
for comments on the manuscript. The work was 
supported by grants from the National Estates 
Grants scheme to W.F. Humphreys. 
REFERENCES 
Harvey, M.S. and Humphreys, W.F. (1995). Notes on the 
genus Draculoides Harvey (Schizomida: Hubbard- 
iidae), with the description of a new troglobitic 
species. Records of the Western Australian Museum, 
Supplement 52: 183-189. 
Humphreys, W.F. (1991). Experimental reactivation of 
pulse driven populations in a terrestrial troglobite 
community. ]ournal of Animal Ecology 60: 609-623. 
Humphreys, W.F. (1993). Stygofauna in semi-arid 
tropical Western Australia: a Tethyan connection? 
Memoirs de Biospeologie 20: 111-116. 
Humphreys, W.F. and Shear, W.A. (1993). Troglobitic 
millipedes (Diplopoda: Paradoxosomatidae) from 
semi-arid Cape Range, Western Australia: 
Systematics and biology. Invertebrate Taxonomy 7: 
173-195. 
Shear, W.A. (1972). Studies in the milliped order 
Chordeumida (Diplopoda): A revision of the family 
Cleidogonidae and a reclassification of the order 
Chordeumida in the New World. Bulletin of the 
Museum of Comparative Zoology 144: 151-352. 
Wyrwoll, K.-H., Kendrick, G.W. and Long, J.A. (1993). 
The geomorphology and Late Cenozoic geological 
evolution of the Cape Range-Exmouth Gulf region. 
Records of the Western Australian Museum, Suppl. 45: 
1-23. 
Manuscript received 3 July 1995; accepted 18 January 1996. 
