30 
Psyche 
[March 
south to Brisbane, and it occurs also at Darwin and as far south as 
the Blue Mountains in New South Wales. It is not known to extend 
to New Guinea and has no close relatives there. Nevertheless an 
apparently distinct, related species occurs in a very small area near 
the tip of Cape York. 
Tachys convexulus n. sp. 
Form nearly as in convexus and with most characters of that 
species; convex, prothorax strongly narrowed behind and with denti- 
form subbasal posterior angles, and elytra broad and convex; color 
dark reddish, elytra 4-maculate (each with a posthumeral and sub- 
apical testaceous spot not very well defined), appendages testaceous; 
shining, without dorsal microsculpture or nearly so. Head .78 & .77 
width prothorax; eyes large and prominent; antennae rather short, 
segment 3 slightly longer than segment 2, middle segments less than 
2X long as wide; frontal foveae short, not sharply defined; mentum 
not foveate at base, with simple tooth at middle. Prothorax rounded- 
cordate; width/length 1.2 1 & 1.20; strongly narrowed behind; base/ 
apex .96 & 1.02; base/head .86 & .88 (base measured across subbasal 
tubercles) ; sides strongly rounded anteriorly, nearly straight and 
strongly converging posteriorly but interrupted by small right or 
acute tubercles of subbasal angles; apex truncate with anterior angles 
rounded; base subtruncate; lateral margins narrow, each with usual 
2 setae about 1/3 from apex and on subbasal angles; disc very convex, 
with anterior transverse impression obsolete, middle line fine; trans- 
verse basal sulcus fine, without conspicuous foveae at middle finely 
punc.ulate. Elytra wide and convex (E/P 1.39 & 1.40), widest not 
far behind humeri; humeri prominent but rounded; margins ending 
inwardly about middle of elytral width, slightly sinuate behind humeri 
but not serrate or setulose ; sutural stria entire except light or abbrevi- 
ated anteriorly, other dorsal striae lacking; stria 8 deep, entire, bowed 
away from margin at and before middle; apical striole as described 
for convexus; dorsal punctures before 1/4 and not far behind 1/2 of 
elytral length. Inner wings fully developed. Male tarsi not visibly 
modified; cf with 1, ? 2 setae apex last ventral segment. Length 2.1- 
2.4; width 0.8-0.9 mm. 
Holotype cf (M. C. Z. Type No. 30334) and 10 paratypes all 
from Bamaga, near the northern tip of Cape York, January 1958, 
taken by myself. They were, I think, washed from debris beside 
sluggish streams in shady places. 
This species is smaller than convexus and slightly narrower but 
structurally similar except for the basal sulcus of the pronotum, 
