Notes on Australian Coleoptera. 105 
Pseudhelluo Wilsonii: length 5’; head broad, covered with 
a dense and strong puncturation, black, with the parts of 
mouth and antenne yellow; eyes very large; thorax short, 
very broad, with the anterior angles rounded; a longitudinal 
sulcate on the middle of the disk; it is flat, very strongly 
punctured, and of a reddish brown; scutellum small and 
elongated; elytra depressed, brown, covered with points, 
and having numerous longitudinal and regular strie: under 
side of the body and legs of a light reddish brown. All the 
upper part of the insect is hirsute. 
From Brisbane; sent to me by Mr. Wilson. 
Acrogonys has been established by Mr. Macleay, junr. 
(“Transactions of the Entomological Society of Sydney,” No. 
2),on an elegant insect from Port Denison; it is very 
nearly allied to Helluo, and if it was not for the form of the 
labrum it ought to be united with that genus. The only 
sort known, HMirsuta, presents two different forms, probably 
sexual; in one, the coste of the elytra are all about equal ; 
in the other, they form on each side of the insect a sort of 
carina. | 
Helluodema is a new genus I propose establishing on Mr. 
Thomson’s Helluomorpha Batesit (“Arch. Ent.” vol 1, p. 134). 
This insect has the general appearance of Helluomorpha, but 
cannot be united with it, the terroinal article of the 
labial palpi being securiform as the maxilliary and the fourth 
article of the tarsi being of the same form as the preceding, 
and not bilobated; the tooth of the mentum is simple, and 
the body without wings. The general form is elongate, 
slender, with the sides of the body almost parallel. The 
compressed form of the antenne clearly separates this genus 
from all the others of the tribe found in Australia. 
This insect inhabits Moreton Bay and the Clarence River. 
Gigadema is a name proposed by Mr. Thomson in his 
“Arcana Nature” fora large Helluo of the northern parts of 
Queensland, the principle character of which ought to be, 
according to this author, the absence of a tooth to the 
mentum, and on this account he compares it only with 
inigma. Unfortunately no sort of Helluwonide probably has 
a tooth more distinct than this, and it is curious to see that 
this very tooth is faithfully represented in the beautiful 
ficure Mr. Nicolet has given of this insect in Mr. Thomson’s 
own work. Without this I should hardly have believed that 
the insect I was studying was the same as Mr. ‘Thompson’s. 
This genus Gzgadema has been established on an entire 
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