1963] 
Darlington — Tachys 
27 
species are apparently dimorphic. In most specimens the wings are 
slightly reduced, not folded or only slightly folded or crumpled at tip, 
and evidently unfit for flight. However my 4 specimens from between 
Murray Bridge and Meningie and 1 from Winchelsea possess large, 
complexly folded, probably usable inner wings. 
Tachys bogani n. sp. 
With characters of australis group as given above. Form as figured 
(Fig. 1), slightly broader and more compact than usual in group; 
color reddish testaceous; shining, microsculpture absent above or 
nearly so. Head short, .79 & .76 width prothorax; eyes moderately 
large and prominent; antennae with segments 2 & 3 subequal, middle 
segments about 2 X long as wide ; frontal foveae sublinear, converging 
anteriorly, extending onto clypeus, partly and vaguely duplicated 
anteriorly by slight grooves outside the main sulci ; mentum conspicu- 
ously bifoveate at base. Prothorax broad; width/length 1.41 & 1.40; 
base/apex c. 1.19 & 1.2 1 ; base/head 1.03 & 1.03; sides rounded anter- 
iorly, nearly straight and rather strongly converging posteriorly, then 
slightly and briefly sinuate before basal angles ; apex truncate, anterior 
angles rounded; base broadly lobed, slightly sinuate and then oblique 
toward sides; posterior angles well defined but obtuse; disc with 
anterior transverse impression and middle line almost obsolete; basal 
transverse sulcus sharply impressed but interrupted at middle, not 
punctate. Elytra with humeri prominent but rounded ; width elytra/ 
width prothorax 1.44 & 1.38; margins behind humeri slightly serrate 
and setulose; elytron 6-striate, with sutural stria entire, punctate 
anteriorly and groove-like posteriorly, and other striae formed by 
abbreviated rows of rather coarse punctures; stria 8 well impressed 
posteriorly, obsolete anteriorly; apical striole rather short, slightly 
curved, not quite parallel to sutural stria, with a strong puncture on 
inner side behind middle of its length; 3rd interval with 2 dorsal 
punctures before 1/3 and 2/3 of elytral length. Inner wings fully 
developed. Secondary sexual characters as described for group. 
Measurements: length c. 2.3 ; width c. 0.95 mm. 
Holotype c? (M. C. Z. Type No. 3033 0 and 1 $ paratype both 
from Bogan River, south of Nyngan, New South Wales, October 
1957, taken by myself probably by washing wet sand or debris beside 
pools in the bed of the Bogan River, which was not flowing at the time. 
This species is distinguished from all others of the group by the 
virtually straight (scarcely sinuate) but converging sides of prothorax 
posteriorly. 
