
WOMERSLEY—MICROTROMBIDIINAE OF AUSTRALIA AND NEW GUINEA 303 

Fig. 5. Echinothrombium lamingtonensis sp. n, A, Crista and eyes (X 200); B, palpal tibia 
and tarsus ( 200); 0, front tarsus and metatarsus (X 125); D, dorsal setae (X 860). 
i) 
+ 
Key To THE AUSTRALIAN SPECIES OF Echinothrombium (ApuLTs). 
» Dorsal microsetae pennate with long outstanding setules, 18-40 long; macrosetae spine-like 
with sparse short setules, 180-220» long. T, elongate, 4054 by 135u, M, 315m. 
lamingtonensis sp. nov. 
Dorsal microsetae not pennate, more or less rod-like and with only short adpressed setules 2. 
Microsetae of dorsum mueh less than one-third length of macrosetae oe a. 8, 
Microsetae about one-third length of macrosetae, 25-454 as compared with 150”, Macrosetae 
with short setules, Ty 3004 by 1204. M, 1954 (adult 9) it willungae (First). 
Maerosetae quite nude, to 2404 long; microsetae 40-50u, T, 4504 by 2104. My, 330 
bardonense sp. noy. 
Maecrosetae with sparse but distinct setules, to 2202 long; microsetae 20-30n long, T, 6304 
by 2704. My 4604 oy +3 rs echidninum (Hirst.). 
Genus SPATHULATHROMBIUM nov. 
As in Echinothrombiwm with the larger dorsal setae long and spine-like, but 
the smaller setae spathulate with ciliations or setules. The posterior arm of the 
crista very evanescent, almost invisible, so that the sensillary area appears to be 
posterior. In all known species the palpal tibia without any external spine, distal, 
portion of tibia slender, about twice as long as basal part. 
Genotype: M, southcotti Wom., 1934, 
