BACCHA 47 



40. Baccka extranea, sp. n. 



c? . Length of body 11 nim., of wing 9 mm. 



Distinguished from any other known African species by its 

 wholly black antenna? (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 scutellum. 



Frontal triangle and face whitish yellow; lunula black ; a black 

 median stripe on the face extending from the buccal 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 white, thick, and soft hair, which is very different from 

 the sparse and rigid hair forming the same fringe in the preceding 

 species ; antenna? 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 triangle, 

 and apparently not banded. Thorax shining seneous black, without 

 any yellow marking, clothed with erect greyish hair ; pleura? 

 slightly greyish, with longer white hair. Scutellum like the 

 thorax, wholly shining bluish black. Scmaniuhe white, with a 

 short fringe; halterts white. Abdomen narrow, entirelv black, 

 the spatulate portion not very broad ; second 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. 

 < Jenitalia shining black, with a short yellowish appendage beneath. 

 The four anterior legs are reddish yellow, with the basal half of 

 femora black and with the tibia? bearing a sharply defined median 

 black ring, tarsi blackened at the apex ; hind legs with the femora 

 black, yellow at the extreme tip, the tibia? black, but broadly yellow 

 towards the base; the tarsi black at the apex. AVings narrow, 

 greyish hyaline, without any distinct marking; sti^mal streak ] ale 

 yellowish ; third vein straight : seventh also straight, the anal cell 

 being therefore regularly lanceolate at the end ; veins black ; 

 alula and axillary lobe well developed ; postical cross-vein almost 

 straight. 



Till><- cf, a single specimen from Salisbury, S. Rhodesia (G. A. 

 K. Marshall). 



41. Baccha marginata, sp. n. 



J . 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 infuscattd wings, 

 which have a blackish fore border. 



