BACCHA 47 
40. Baccha extranea, sp. n. 
3. Length of body 11 mm., of wing 9 mm. 
Distinguished from any other known African species by its 
wholly black antennz (which besides have an elongated third joint), 
the black-striped face, and the sharply -defined pale yellowish abdo- 
minal spots. The present species has no ally in the African fauna, 
and resembles the American clavata, Fabr., from which, however, 
it is at once distinguished by the wholly black seutellum. 
Frontal triangle and face whitish yellow; lunula black ; a black 
median stripe on the face extending from the buceal cavity to the 
lunula, but becoming smaller and undefined above ; peristoma 
narrow, pale yellow, with a narrow blackish border along the eyes ; 
vertical triangle shining black ; occiput black, grey- -dusted, with a 
fringe of whine thick, ay soft hair, which is very different from 
the sparse and rigid hair forming the same fringe in the preceding 
species; antenne wholly black, the third joint rather elongate, 
almost as long as the arista, which is brown and short; eyes 
touching along a line equal to the length of the vertical tr iangle, 
and apparently not banded. Thorax shining wneous black, without 
any yellow marking, clothed with erect greyish hair; pleure 
slightly greyish, with longer white hair. Seutellum like the 
thorax, wholly shining bluish black. Squamule white, with 
short fringe; halteres white. Abdomen narrow, entirely black, 
the spatulate portion not very broad ; seeond segment cylindrical, 
as long as the third; hairs on the stalk short; second segment 
with a small rounded whitish spot on the middle of the sides; 
third with a like spot, which is, however, broader and nearer to 
the base; fourth with two larger spots, which are almost in con- 
tact with the base and approach each other above in the middle. 
Genitaha shining black, with a short yellowish appendage beneath. 
The four anterior legs are reddish yellow, with the basal half of 
femora black and able the tibie bearing a sharply defined median 
black ring, tarsi blackened at the apex ; “hind legs with the femora 
black, yellow at the extreme tip, the tibize black, but broadly yellow 
towards the base; the tarsi black at the apex. Wines narrow, 
greyish hyaline, without any distinct marking; stigmal streak pale 
yellowish ; third vein straight ; seventh also stiaibht the anal cell 
being therefore regularly lanceolate at the end ; veins black ; 
alula and axillary lobe well developed ; postieal cross-vein almost 
straight. 
Type 3,a single specimen from Salisbury, S. Rhodesia (G. A. 
The: Marshall). 
41. Baccha marginata, sp. n. 
3. Length of body 12 mm., of wing 10 mm. 
Distinguished by the golden pubescence on the thorax, by the 
yellow margins of the buccal cavity, and by the infuseated w ings, 
which hee: a blackish fore border. 
