NEW AUSTRALIAN BUMS. 
43 
with scattered punctures ; supraclypeal area large, convex, shining but not 
polished ; hair of head and thorax scanty, dull white, face with little hair ; 
mesothorax shining, with scattered punctures ; scutellum shining, with only the 
faintest median depression ; area of metathorax large, semilunar, concave, the 
margin somewhat shining, the surface very delicately sculptured with fine 
plicae, irregular and more or less joined by minute cross-lines, and failing some 
distance before the apex, the region beyond the plicae granular ; posterior 
truncation dullish ; tegulse practically black, with an obscured red spot ; wings 
dusky, stigma dark reddish brown, nervures fuscous ; second cubital cell broad, 
receiving recurrent nervure at apical corner ; third cubital broader above than 
second ; legs black, with the tarsi obscure reddish brown ; abdomen polished, 
shining, pure black, without hair bands or spots. 
Two males : National Park, Queensland, Dec. 1919 ( H . Hacker) ; Queens- 
land Museum. Resembles //. plebeius Ckll. , but much larger, with dark tegulaa 
and different metathorax. 
Halictus exceptus sp. n. 
Female. Length about. 7 mm. ; robust, black, including antennaj ; 
mandibles obscurely reddened apically ; pubescence very scanty and short ; 
head broad, inner orbits arched : olypeus shining, with scattered punctures, not 
at all silicate in middle ; supraclypeal area dullish ; mesothorax shining, with 
well Separated strong punctures (dense at sides), the intervals minutely striate ; 
scutellum moderately shining, the median depression very weak ; mesopleura 
transversely striate ; area of metathorax large, semilunar, dullish, with very 
delicate plicae, the margin not distinctly shining ; the plicae fail a considerable 
distance before the margin ; tegulse rather dark rufous ; wings rather strongly 
reddened ; stigma large, dusky rufous, nervures fuscous ; second cubital cell 
very broad, receiving recurrent nervure near end ; outer recurrent and inter- 
cubitus much weakened ; legs obscure brownish, the tarsi rather pale reddish 
brown; abdomen shining black, with very little hair, but small white hair- 
patches at lateral bases of second and third tergites, and, when the fourth 
tergite is extended, an entire white band (dense at sides, thin and weak in 
middle) is seen at base ; hair of venter straight and comparatively short. 
Three females: Tooloom, N.S.W., Jan. 1926 (II. Hacker). Allied to 
II. seminitens Ckll., but readily distingushed by the tarsi. 
Halictus micridoneus sp. n. 
Male. Length about 4-5 mm. ; shining black, with rather short abdomen, 
bead large and rather broad ; pubescence pale and very scanty, the face and 
•clypeus with thin erect white hair ; antennae short, like those of a female ; 
tegument of clypeus black, the extreme edge hardly noticeably pallid ; labrum 
rufous ; mandibles black, with a broad light-yellow band ; Supraclypeal area 
shining ; front very densely punctured ; at each side of the ocelli is a shining 
area with sparser pmretures ; mesothorax shining, but strongly punctured ; 
