
300 RECORDS OF THE S.A. MUSEUM 
EcHINOTHROMBIUM WILLUNGAE (Hirst, 1931). 
Microtrombidium willungae Hirst, 1931. P.Z.8., (1), 562. 
Microtrombidium spinatum Womersley, 1934. Ree. 8. Aust. Mus., 5 (2), 192. 
Echinothrombium spinatum Womersley, 1937. Rec. 8. Aust. Mus,, 6 (1), 89. 
Echinothrombium willungae, Womersley, 1937, (bid., 89. 
Fig. 3 A-EK. 
In the original deseription of spinutum the dorsal setae were stated to be 
all of the one type. They are, however, of two very different lengths, although 
much of the same type. A careful comparison of the type with the description 

Fig. 3. Echinothrombium willungae (Hirst). A, Crista and eyes (> 200); B, palpal tibia 
and tarsus (X 200); C, front tarsus and metatarsus 9 (x 200); D, same of f (X 200); E, 
dorsal setae (x 860). 
of Hirst’s willwngae and with specimens of the latter from many South Austra- 
lian localities shows that spinatwm is co-speecific with willwngae and must there- 
fore sink as synonymous with it. 
This species is, as stated by Hirst, closely related to echidninum from which it 
differs in the dimensions of the front tarsi and metatarsi and in the different 
dorsal setae. In willwngae the smaller dorsal setae are longer than in echidninum, 
