D4 
pari; prothorace minus crebre vix dupliciter punctulato ;. 
elytrorum versus apicem striis magis perspicue punctulatis. 
interstitiis manifeste convexis angustatis. 
Maris tibiis anticis (paullo supra medium) dente valido armatis. 
Femine tibiis muticis. Long., 44-5 1.; lat., 14-—14 1. 
This species is closely allied to the preceding two. I should 
hesitate to consider its differences more than accidental peculiari- 
ties of an individual if I had seen only a single example, but I 
have before me several of each sex in all of which the distinctive 
characters are quite constant. H.arida may be at once dis- 
tinguished from the other two by its considerably more elongate 
and less transverse prothorax arched on the sides only feebly. 
H. sitiens differs from the other two by the dark color of its 
antenne and legs as well as by the sparseness of the punctures 
between its eyes and from arida by its more slender antenne 
with comparatively longer third joint,—while H. callabonensis 
differs from the other two by the finer punctures of the prothorax 
being almost absent by the striz of its elytra being quite con- 
spicuously punctulate to the apex and by its elytral interstices 
becoming narrower and quite evidently convex near the apex. 
Central Australia; taken near Lake Callabonna by Mr. Zietz. 
N.B.—In my tabulation of species of Homotrysis (Tr. Roy. 
Soc. S.A. 1891 pp. 320-1) the three above described would form 
a separate section under “ AA” on page 321 (assuming, that is, 
that the eyes of the male,—as is probably the case,—are not 
materially different in H. arida and sitiens from those of H. calla- 
bonensis). The tabulation then will end as follows :—. 
AA. Interval between eyes in both sexes greater than the width 
of either eye as seen from above. 
B. Punctures of elytral strize,—at least in front half of elytra, 
—well defined, and quite distinct from the much smaller 
interstitial punctures. 
C. Head strongly and rather closely punctulate between the 
eyes. 
D. Coarser punctures of  pro- 
thorax much confused with 
fine puncturation.. arida, Blackb. 
DD. Prothorax almost devoid of 
fine punctures ... callabonensis, Blackb. 
CC. Punctures between the eyes 
very fine and very sparse... sitvens, Blackb. 
BB. Punctures of  elytral strize 
scarcely defined as distinct 
from those of the interstices... carbonaria, Germ. 
