100 SYRPHID ®. 
blackish ; venter shining yellow. The four anterior legs are almost 
entirely pale | yellow, the femora darkened on the apical half, more 
distinctly so in the male; hind femora enormously thickened in 
both sexes, pale yellow interiorly, blackened towards the middle 
exteriorly, with some whitish hairs above and some black ones 
below; hind tibie arched and with a short fringe; tarsi yellow. 
The black basal spot of the femora is very distinct. Wings 
hyaline, bare, unspotted; veins in great part yellow; marginal cell 
broadly open; loop of the third vein deep and narrow, not appen- 
diculated ; lower corner of discal cell with a short stump. 
Type & and type 2, a couple of specimens from the Cape of 
Good Hope. 
Genus 19. MERODON, JMe/gen (1803). 
Of this characteristic Mediterranean genus there are only a few 
Ethiopian species known; the collection comprises the three 
following :— 
1 (2) Face retreating below, not at all prominent 
towards the buccal cavity ; lower corner 
of the discal cell with a short stump . ..  plantfacies, sp. n. 
2 (1) Face even more prominent than usual at the 
buccal cavity; lower corner of the discal 
cell not appendiculated. 
(4) Abdomen at the base with an orange spot on 
each side of the second segment; antennze 
t 
» 
and tars: entirely black .......... . melanocerus, sp. 0. 
4 (2) Abdomen at the base entirely black; antennes 
and fare] reddish... 04.0600 ceeccesens nasieus, Bere 
107. Merodon planifacies, sp. n. 
3. Length of the body 10 mm. 
A yather aberrant species, very distinct from any other on 
account of the shape of the face; in general aspect not much 
differing from JZ. constans, Rossi, but the hind trochanters and 
the hind tibiz are wholly simple. 
Head black, densely clothed with grey hair, the vertical tri- 
angle alone being shining and the hairs around ocelli dark ; eyes 
touching for a considerable distance, covered with whit'sh hair, 
which is dark on the upper part; frontal triangle not very pro- 
minent, densely clothed with whitish hair ; face very short and 
entirely flat, a little retreating, not prominent at the buccal 
eavity, distinctly shorter than the eyes; antennz short, reddish, 
the third joint rectangular and of a pale yellowish colour; arista 
bare, yellowish; opening of the buccal cavity very small; pro- 
boseis short and concealed. Dorsum of thorax clothed w ith dense 
and rather long grey hair; it is of a shining «neous colour, 
and has three broad purplish-black bands, the middle one being 
abbreviated behind and divided by a thin ieneous line,~ while 
