1962] 
Darlington — Tachys 
119 
so that posterior angles are sometimes not quite basal (but I have 
measured width of base of prothorax across the prominent sub-basal 
angles) ; apex subtruncate; lateral margins narrow, each with usual 2 
setae; disc with anterior transverse impression obsolete, middle line 
moderately or lightly impressed but extending posteriorly behind 
transverse sulcus, and latter variably impressed, sometimes interrupted 
at middle. Elytra with rather prominent but more or less rounded 
humeri; margins not serrate or faintly so; sutural stria entire and 
deeply impressed; 5th stria deeply impressed at base (except in lutus) ; 
8th stria absent excepting an apparent remnant deeply impressed near 
apex and including 2 strong punctures; apical striole ending anteriorly 
in or (usually) reduced to a conspicuous elongate puncture; 3rd 
interval or stria 3-punctate. Inner wings fully developed. Abdomen 
sparsely, inconspicuously pubescent ; front tibia with outer apical angle 
less strongly oblique than usual in Tachys ; posterior tarsi rather short ; 
males with 2 segments each front tarsus widely dilated, and males with 
1, females 2 setae each side apex last ventral segment. 
The known range of the hobarti group is Tasmania and temperate 
southeastern Australia north to Rockhampton. All the species occur 
in sand or gravel or under stones by rivers or brooks. Some of the 
species superficially resemble Perileptus , with which they sometimes 
occur. 
Key to species of Tachys of hobarti group 
1. Dorsal striae (except sutural) obliterated lutus 
- Stria 5 and usually some other dorsal striae distinct at least in 
part 2 
2. Striae 1 and 5 well impressed but 2-4 light, irregular, sometimes 
hardly traceable; clypeus not impressed anteriorly; rather shining; 
size small (length c. 1.8 mm.) kingi 
- Striae 2-4 distinct and individually traceable at least behind 
anterior dorsal puncture, although less impressed than 1 and 5 ; 
other characters variable, but none of the following species has all 
the characters given above for kingi 3 
3. Black; more shining, with microsculpture less distinct; clypeus not 
distinctly impressed; length 2.3-2. 7 mm. (may include wattsense 
Blackburn and leai Sloane) hobarti 
■ Reddish; less shining, with microsculpture (microreticulation and 
punctulation) more distinct; clypeus impressed at middle anteriorly 
4 - 
