492 Annals of the South African Museum. 



baud. Antenuae black, long, covering almost the whole of the 

 epistome ; 2nd joint very short, 3rd, 7-8 times as long as the 2nd, 

 but sometimes less in the $ ; antennal chaeta long and fine, black, 

 thickened at the base, slightly pubescent. Palpi robust, black, as is 

 also the proboscis, which is thick and not elongated. The frontal setae 

 include : 1 pair of ocellary setae directed forwards, well developed, and 

 even robust in the 9 ; on both sides 1 pair of vertical setae, the outer 

 ones short, and 2 ascending frontal. Forward, 2 frontal setae reach 

 beyond the insertion of antennae as far as the end of the 2nd joint. 

 Above the very long great vibrissae, short and reclining facial setae 

 ascend generally as far as the centre of the epistome or a little beyond. 

 Upper occiput with a row of small black setae behind the ciliae. 

 Wings slightly greyish or yellowish-grey ; no costal spine ; 4-6 ciliae 

 at the base of the 3rd nervure. Cubitus of the 4th nervure a little 

 obtuse and blunt ; posterior transverse hardly flexuose, distant from 

 the cubitus. Squamae whitish ; halteres testaceous, club dark. 

 Legs black ; tibiae often reddish-brown ; the posterior with unequal 

 setae. 



Length 7-13 mm. The small examples (7 mm.) are from the 

 Gold Coast. 



Cape Town (L. Prriuguey) ; Natal, Durban (F. Leigh), S. Afric. 

 Museum ; Nyassalaud. 



GEN. PEXOPSIS Br. & Berg. 



PEXOPSIS PYRRHASPIS, n. sp. 



Wholly ashy grey ; scutellum partly pale rufous ; abdomen with 

 weak, dark beams on segments 2 and 3 which bear behind an obscure 

 baud, segment 1 blackish and deeply excavated, segment 4 bright 

 shining red in the terminal half, which is bristling with black setae 

 moderately robust and disposed on 2 rows. Segments 1 and 2 

 with 2 erect, median, marginal setae ; segment 3 with a row of spaced 

 robust setae. 



Head high, greyish white, moderately opaque ; frons projecting, 

 about as wide as the diameter of eye to vertex ; orbits becoming in 

 front wider than the dark frontal baud ; face somewhat reclining, 

 facial ridges exposed, projecting, yellowish and with small, closely set 

 setae immediately above the great vibrissae, the latter inserted slightly 

 above the buccal opening. Peristome as wide as -f of the height of 

 the eye. The broad geuae often bear sparse ciliae at the very top as 

 in Viviania B. B. Antennae long and narrow, but nevertheless shorter 



