Australian Arrenurus 
239 
occurred at the type locality, both represented by 
one female. I assigned the small female to A. 
harveyi, the large female to A. liliaceus sp. nov., 
because the male of liliaceus is larger than harveyi. 
The female of A. harveyi is close to A. liliaceus and 
A. pseudoaffinis and differs only in the shape of the 
chitinized patches of the genital valve. The shape 
of the ligulate process separates the male from 
other species. 
Etymology 
The species is named after Dr M.S. Harvey. 
Arrenurus (Arrenurus) liliaceus sp. nov. 
Figures 15-19 
Material Examined 
Holotype 
8, Chinderwariner Pool, Millstream-Chichester 
National Park, Western Australia, Australia, 15 
August 1994 (WAM). 
Paralype 
Australia: Western Australia: 1 $, same data as 
holotype (WAM). 
Diagnosis 
Male with a broad, posteriorly rounded petiole; 
ligulate process absent; hyaline membrane large 
but thin, indented laterally and posteriorly. 
Females with distinct posterolateral comers of the 
body, genital valves with chitinous patches, 
anterior patch triangular, posterior rounded; 
genital plates straight and narrow, laterally 
widened. 
Description 
Male 
Body 1242 long and 883 wide. Body colour 
blueish-green. Anterior margin of body concave. 
Cauda and pygal lobes well developed. Dorsal 
furrow incomplete (Figure 16). D1 and D4 on 
humps (Figure 17). Gonopore 65 long. Genital 
plates long, wing-shaped, not extending to lateral 
body margin (Figure 15). Hyaline membrane 
present, but very thin and difficult to observe, 
laterally and posteriorly indented. Petiole large, 
widened in the middle, posterior margin convex. 
Petiole 184 long (measured from ventral view) and 
155 wide. Ligulate process absent. Lengths of PI-V: 
41, 91, 89, 118, 73. PIV with a hump; P1I with one 
seta near anteroventral corner and two setae 
located near the middle of anterior margin (Figure 
18). Lengths of I-leg-4-6: 214, 180, 221; lengths of 
IV-leg-4-6: 291,194, 184. IV-leg-4 with a long spur. 
Female 
Body 1140 long and 951 wide. Anterior margin 
of body concave. Posterolateral corners very 
distinct. Gonopore 145 long; genital valves with 
large chitinous patches, the anterior patch 
triangular, the posterior patch rounded. Genital 
plates long, straight and narrow, not extending to 
lateral body margin, laterally widened (Figure 19). 
V2 on humps. Lengths of PI-PV: 29, 77, 62, 96, 60. 
PII with 2 anteroventral and 1 more dorsally 
located seta on medial side of PII; hump of PIV 
absent. Lengths of I-leg-4-6: 170, 155, 165; lengths 
of IV-leg-4-6 223, 175,165. 
Remarks 
The male is close to A. shoesmithi Wiles from 
Malaysia (Wiles 1993). This last species has a 
petiole gradually tapering posteriorly, a trapezoid 
hyaline membrane with a posterior margin which 
is only slightly concave, and a dorsal shield not 
narrowed in the middle. Females of the two species 
differ in the shape of the genital plates. The male of 
A. latipetiolatus Piersig from the Bismarck-Archipel 
(Piersig 1903) also has a wide petiole, but this 
petiole is narrowed anteriorly. For similar species 
of the female see discussion at A. harveyi sp. nov. 
Etymology 
The species name is derived from the fact that 
the type locality the Chinderwariner Pool, has an 
abundant growth of water lilies. 
Arrenurus (Arrenurus) mantonensis sp. nov. 
Figures 20-24 
Material Examined 
Holotype 
8, Manton Dam, Northern Territory, Australia, 1 
August 1994 (NTM). 
Par a types 
Australia: Northern Territory: 1 8 (not fully 
sclerotized) (ZMA), 2 9 (one not fully sclerotized) 
(ZMA, NTM), 2 nymphs (ZMA), same data as 
holotype. 
Diagnosis 
The very slender PIV is diagnostic for the new 
species. Petiole with bifurcated setae; hyaline 
membrane absent. 
Description 
Male 
Body 917 long (including petiole) and 689 wide. 
Body colour yellowish. Anterior body margin V- 
shaped. Cauda well developed, pygal lobes short 
and broad. Dorsal furrow extending onto cauda 
(Figure 21). D1 on humps, lateral of D4 a seta on 
