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tulato, utrinque pone medium fovea curvata (hac haud vel 
minus distincte punctulato) impresso; elytris fortiter striatis, 
striis interioribus vix distincte (ut A. edentuli, Macl.) 
exterioribus sat fortiter (quam A. edentuli magis fortiter) 
punctulatis, interstitiis sat fortiter convexis. Long., 10— 
111.5 lat., 32—4 1, 
Easily distinguishable by its prothoracic puncturation much 
more distinct than in any other (at any rate than in any other 
known to me) of its congeners, in all of which the punctures are 
very sparse and discernible only with a strong lens (e.g., a Cod- 
dington), while in the present species they are notably less 
sparse and quite distinct under a very ordinary lens. Compared 
with A. edentulus moreover this insect is smaller, narrower, more 
nitid and blacker, with the punctures of the external elytral 
strie very much stronger. The elytral interstices moreover are 
evidently more convex than in A. edentulus, but I do not lay 
much emphasis on this character as the interstices of the elytra 
seem to vary in convexity within the limits of a species,—proba- 
bly sexually. 
The genus Aulacocylus is one presenting very great difficulty 
on account of the externally close alliance inter se, and the brevity 
of the descriptions, of its species, Seven names have I believe 
been given to Australian species (if Aosenbergi, Kaup, be Aus- 
tralian which however seems doubtful). Two of these (according 
to Gemminger and Harold) are synonyms of edentwlus, Macl., 
and this is probably a correct reference. AKawpi, Macl., I strongly 
suspect of being another synonym of the same _ species. 
Rosenbergi, Kaup, and Percheroni, Kaup, seem incapable of 
identification without examining the types. They are said to be 
remarkable for the shortness of their frontal horn and the feeble- 
ness of their elytral puncturation. Gemm. and H. regard them 
as referring to only one species. Tres, Perch., seems to be a 
good species (unknown to me) fully twice as large as the species 
I have described above. I have examined the type of edentulus, 
Macl., and I think it is the species Burmeister applies the name 
to, though in that case his description cannot be called a good 
one, as it emphasises characters that do not seem to be constant. 
LAMELLICORNES. 
ISODON. 
T have lately had occasion to attempt the determination of a 
number of examples some (at least) of which are referable to this 
genus, and have arrived at a conviction that no satisfactory 
generic distinction can be drawn among the Australian species 
that have been referred to [sodon and Heteronychus. On first 
