336 MEMOIRS OF THE QUEENSLAND MUSEUM. 
A black species with partly flavour, almost white, elytra ; of several similarly 
coloured species, II. opaciceps, cribriceps, and medioflavus have differently sculptured 
head and longer and distinctly serrated antennae ; opaciceps also has more of the 
base of the elytra dark, and medioflavus has less. H. ftavipennis has paler antennae 
and elytra, and differs slightly in the sculpture of the head. The head of the male 
is distinctly bifoveate, but is not strongly sculptured otherwise. The female has the 
frontal fovese somewhat smaller than on the male, but has a fairly distinct median 
line, which is scarcely traceable on the male. Under the microscope the comb of 
the front tarsi is seen to be composed of about thirty teeth. 
Helcogaster medioniger n. sp. 
Deep shining black, head dull flavous, with a complete median black 
vitta, basal third of antennae and parts of legs pale. Glabrous, except for minute 
pubescence almost confined to legs. 
Head wide and somewhat flattened near eyes, with an interocular impression, 
margining which are three small elevations, two in front and one behind. Antennae 
rather long and feebly serrated. Prothorax moderately transverse, with a rather 
deep transverse impression near base ; with scattered punctures. Elytra with 
minute, rugose punctures. Basal joint of front tarsi with a conspicuous black inner 
comb. Length, l*8-2-0 mm. 
New South Wales : Upper Williams River, in October (A. M. Lea). Type, 
in South Australian Museum. 
In many respects close to H . coelocephalus , but on the male of that species 
the head, when viewed from behind, is seen to have four triangular elevations — 
two black median ones and a pale one near each eye : the head of the present species 
is flat near the eves, and although there are three dark median elevations they are 
not distinct w'hen viewed from behind. The colours, except that the legs are more 
variegated, are much as on H. triangulifer , but the head is very differently sculptured. 
The head is pale, with a dark median vitta appearing parallel from some directions ; 
parts of all the tarsi, the middle and hind knees and tips of tibiae, the front tibiae 
and most of front femora, are more or less flavous. 
Helcogaster holomelas n. sp. 
(J. Deep shining black, parts of the mouth obscurely diluted with red. Head 
minutely pubescent, elsewhere almost glabrous. 
Head convex, with a reversed \ r -shaped impression, caused by two conjoined 
foveae in front, and with a faint interocular impression. Antennae moderately long 
and feebly serrated. Prothorax moderately transverse, with a rather deep transverse 
subbasal impression ; with a few scattered punctures. Elytra with fairly numerous 
but minute wrinkled punctures. Length, 2-5-30 mm. 
9- Differs in having the head smaller, with shallower impressions, the antennae 
slightly shorter, and the front tarsi simple. 
Queensland : Somerset and Mabuiag Island (C. T. McNamara). Types, in 
South Australian Museum. 
An entirely black species, except for the obscure muzzle, but larger than 
H . gagatinus , and frontal impressions shallowly connected so as not to be two 
