ANNALS 
MEDEDEL1NGEN 
OF THE VAN" HET 
J’mnsvaal Museum. 
Vol. II. JANUARY, 1911. No. 4. 
ON THE PARASITIC HYMENOPTERA COLLECTED BY 
MR. A. J. T. JANSE, TRANSVAAL. 
By P. Cameron. 
Very little lias been written on the parasitic Hymenoptera of the 
Transvaal. The material collected so industriously by Mr. Janse (whose 
study is the Lepidoptera, not the Hymenoptera) forms a very welcome 
contribution towards our knowledge of that part of South Africa. In 
my paper on the parasitic Hymenoptera of the South African Museum, 
Capetown (Annals of the South African Museum, v, 17-186), I was only 
able to record, from the material in the museum’s collection, thirteen 
species from the Transvaal. I am very glad to be able to record, from 
the rearings of Mr. Janse, the larval hosts of a number of the species. 
TENTHREDINIDAE. 
Arge pretoriaensis, sp. n. 
Dark blue, densely covered with a white pile, the sides of the pronotum 
to shortly below the middle, the mark triangular, the narrowed end at 
the base, the tegulae, a large mark on the upper part of the mesopleurae, 
extending from the base to near the apex, the lower part obliquely narrowed 
to an acute point from the apex to the base ; the apex rounded, with an 
incision in the middle at the oblique furrow ; the antennae darker coloured 
than the body, densely covered with black pubescence. Wings hyaline, 
iridescent, the nervures and stigma blackish fuscous, the base of the stigma 
pale. Female. 
Length, 7 mm. 
Pretoria. January. 
Head hardly, if at all, dilated behind the eyes. Second abscissa of 
radius about one-fourth longer than the third, which is of the same length 
as the fourth ; the first transverse cubital nervure is fainter than the 
