134 Mr. G. R. Waterhouse’s Descriptions 
of a smaller size and shorter form ; the thorax is more thickly 
punctured, and the antennas and legs are totally black. 
When I first saw this insect, I imagined that it was identical 
with our turnip fly, and that it had probably been introduced into 
Australia with turnip seeds, &c. ; but upon comparing several 
specimens, brought over by Mr. Darwin, with our species, I found 
they invariably differed as above mentioned. 
The species next described has but ten joints to the antennas, 
and the apex of the posterior tibiae is prolonged beyond the base 
of the tarsus : in fact it possesses the characters of the sub-genus 
Macronema (^Megerle). 
Species 1. (11.) Macronema scutellata. 
M. caerulea, sub-ovata et lata ; thorace elytris angustiori ; 
antennarum articulis tribus basalibus testaceis; corpore subtus 
nigro ; tibiis tarsisque brunneis ; scutello aeneo ; capite im- 
punctato ; thorace punctato ; elytris punctato-striatis, inter- 
stitiis laevibus. 
Long. corp. 1 | — 1 1 lin. 
Habitat near Sydney. 
Obs. — This species is rather less than the Macronema napi ; it 
is of a shorter and broader form, and the thorax is narrower in 
proportion to the elytra. 
The remaining species here described belong to Latreille’s sub- 
genus Dibolia. They depart from the more typical Halticce in 
having the head placed vertically, nearly hidden by the thorax, 
very broad (generally equal in width to the thorax) ; the thorax 
and elytra being nearly of equal width, and of a somewhat cylin- 
drical form ; and in having the tibiae furnished with a tooth-like 
process in the middle externally. The antennae are very slender ; 
they somewhat resemble the Eumolpi. 
Species 1. (12.) Dibolia cenea. 
D. aenea vel aeneo-viridis, subtus nigra ; pedibus, palpis anten- 
nisque testaceis, femoribus fuscescentibus ; capite fere tho- 
racem latitudine aequante, et punctulatissimo ; thorace postice 
latiori, punctulatissimo ; elytris profunde punctato-striatis ; 
interstitiis laevibus. 
Long. corp. 1 lin. 
Habitat near Sydney. 
Obs. — This species is about the size of Dibolia Cynoglossi. 
