ON COLEOPTEBA , MOSTLY FROM QUEENSLAND. 
359 
?■ Differs in having a wide shallow impression on the front of the head, 
which is non-tuberculate, antennae thinner and even less serrated, abdomen wider 
and front tarsi simple. 
New South Wales : Upper Williams River (F. E. Wilson and A. M. Lea). 
The colours, except for the spotted abdomen, are as on H. trisinuatus , but the 
head is differently sculptured, the trisinuate base of the excavation distinguishes 
from H. rhyt ice plied its, and less of the abdomen is spotted, &c. The median sinus of 
the head is wider than the lateral one ; seen from behind there appear to be three 
small elevations, a blunt median one (placed in front of the excavation), and a small 
acute one on each side of it (each placed near an antenna) ; from the sides there 
appear to be three small tubercles on each side : the median one, one near each antenna, 
and the front end of the median sinus. There is a small black spot at the base of the 
head, but it is normally concealed by the overlapping prothorax. A second male 
has rather more of the elytra dark than the type. The only female in the Museum, 
that appears to belong to the species, has the seuteUum black, the apical half of 
elytra (except the extreme margins) black, with the black triangularly advanced on 
the suture, and the tip of abdomen, as well as a spot on each segment, black. 
Helcogaster affinis n. sp. 
3- Flavous ; base of head, scutellum, apical half of elytra, metasternum, 
abdomen, and seven apical joints of antennae black or blackish. Sparsely pubescent. 
Head with an interocular impression trisinuate posteriorly. Antennae 
moderately long and feebly serrated. Prothorax slightly longer than the greatest 
width, widely transversely depressed near base ; with a few scattered punctures. 
Elytra with minute, wrinkled punctures. Basal joint of front tarsi with a black 
inner comb. Length, 3 mm. 
Differs in having the head more convex and narrower across eyes, with 
two small frontal depressions and a shallow median line, more of its base blackish, 
antennae thinner and not serrated, parts of the legs infuscated and front tarsi simple. 
New South Wales : Upper Williams River (A. M. Lea). Types, in South 
Australian Museum. 
The head of the male is not longitudinally sulcate to base, as on the male 
of H. sulciceps , which it greatly resembles, and the antennae are longer. The 
excavation of the head is somewhat obscured by pubescence, it is trisinuate 
posteriorly, but the median sinus is rather small ; there is a small median elevation, 
but it is not visible when the head is viewed from behind ; the only sharply defined 
punctures on the head are on the black basal spot. 
Helcogaster tuberculiceps n. sp. 
c?- Flavous ; apical two-thirds of elytra, metasternum, two apical segments 
of abdomen, and seven apical joints of antennae black, palpi and parts of tarsi 
infuscated. Sparsely pubescent and with a few dark hairs, more numerous on head 
and tip of abdomen than elsewhere. 
Head with a wide interocular depression, evenly curved posteriorly ; with 
a strong median tubercle sloping down to the apex ; base rather densely punctate. 
Antennae long and feebly serrated. Prothorax about as long as its greatest width, 
widely depressed near base ; with a. few scattered punctures, the sides feebly 
