314 Natal. Rees 
mandibles very long, falciform, chestnut-red in middle; clypeus with 
a sericeous surface, and only minute indistinct punctures, the apical 
middle depressed ; front somewhat glistening; mesothorax dullish, 
hairy, with scattered minute punctures: posterior part of mesothorax 
and scutellum more shining, but not polished; area of metathorax 
with strong but irregular and often broken plice ; posterior truncation 
sharply defined at sides; tegule rufopiceous ; wings hyaline, faintly 
dusky, stigma and nervures dilute brownish, the stigma quite pale ; 
marginal cell ending as in //. trimenc; first recurrent nervure meeting 
second transversocubital; legs black, with small joints of tarsi 
chestnut-red ; abdomen very broad, shining, with excessively minute 
punctures, hind margins of segments rufescent ; no hair-bands, but 
thin pale hair at sides of segments; apical plate rounded, only 
moderately large ; large sub-apical ventral spines. 
@. Similar, but head and mandibles ordinary, not enlarged ; bases 
of abdominal segments with bands of greyish tomentum, as in H. 
trimeni. Readily known from /. trimeni by the entirely pale hair of 
mesothorax and scutellum ; the surface of the scutellum is dull. The 
hind spur is of the same type as that of ¢rimeni, but the enlarged 
basal tooth is narrow and distinctly spiniform. The stigma is amber 
colour. 
Winklespruit, Natal, both sexes, 29th December, 1918, a female 
2nd January, 1919 (C. N. Barker). 
The following species belong to other groups of Halictus. 
HALicrus FARQUHARI, Sp. nov. 
g (Type). Length about 9 mm. ; black, rather slender, with rather 
abundant erect greyish pubescence ; legs dark reddish-brown, anterior 
knees and tibie in front redder ; head oblong, longer than broad, 
facial quadrangle very much longer than broad; mandibles red sub- 
apically; clypeus entirely black, projecting, polished, with large 
punctures ; head considerably produced above the eyes; flagellum 
long and slender, bright ferruginous beneath ; front dull and granular , 
mesothorax and scutellum shining, with distinct fairly large punctures ; 
metathorax very hairy except the basal area, which is covered with 
fine vermiform wrinkles ; posterior truncation not sharply defined at 
sides; tegule rufous; wings hyaline, faintly dusky at apex; stigma 
and nervures dull ferruginous ; first recurrent nervure joining apical 
corner of second submarginal cell; abdomen without distinct 
punctures, dullish, more shining toward apex ; bases of first three 
