52 SYRPHIDJ. 



coxae entirely pale yellow ; front tarsi with the basal joint showing 

 at the base a very conspicuous but short black stripe. Wings 

 hyaline, with a faint yellowish tinge ; subcostal cell very long, pale 

 yellowish, but there is no distinct stigma ; veins black, yellowish 

 towards the base, the first being yellow throughout its whole 

 length ; third vein strongly bent backwards at the end, and there- 

 fore ending beyond the tip of the wing, the submarginal cell being 

 greatly dilated at the apex. 



Type <$ , a single specimen from Ruwe, Lualaba R., Belgian 

 Congo, circa 11 S., 26 E., ii. 1906 (Dr. A. Yale Massey). 



A single badly-preserved male from Durban seems to belong to 

 this or to a very closely allied species ; it has no black spot on the 

 breast, and the hind borders of the abdominal segments are very 

 narrow and linear. 



46. Rhingia semicserulea, Austen (1893). 



Distinguished by the aeneous, partly caeruleous, thorax, and by 

 the yellow, black-banded abdomen, the band on the second segment 

 not being dilated at the sides. 



The determination is doubtful, because the specimens are not 

 well preserved ; the subcostal cell is distinctly } T ellowish, the legs 

 are infuscated, the thorax, sides, and pleurae are partly dark 

 yellowish, the frons of the female is shining blue, but the antenna! 

 tubercle is yellow in front and black behind. 



A couple from Blantyre, Nyasaland Protectorate, 5. iii. 1910 

 (Dr. J. E. S. Old), the male with the proboscis accidentally pro- 

 truding, measuring 9 mm. in length, while normally the proboscis 

 is not longer than the snout ; an immature female specimen from 

 Zomba, Nyasaland (Dr. H. S. Stannui). The species was origin- 

 ally described from Sierra Leone. 



47. Rhingia pellucens, sp. n. 



cJ $ . Length of body 9 to 10 mm. 



Allied to the preceding, but distinguished by its smaller size and 

 differently coloured thorax and abdomen. 



Head of the male almost entirely occupied by the eyes, which 

 are united along a very long line, as long as 2| times the black 

 vertical triangle, and have the upper facets very large and redder 

 in colour than the others ; eyes of the female with equal facets, 

 parted by a broad frons which is blue, very glittering, with short 

 dark hair, without any tomentum and with the antennal tubercle 

 dark reddish yellow ; face and snout in both sexes and the bare 

 frontal triangle in the male reddish yellow ; peristoma yellow ; 

 antennae orange -coloured, the third joint a little longer than broad, 

 with a long bare } T ellow arista, which is brown towards the tip. 

 Thorax shining blue or aeneous in the middle, clothed with erect 

 pale hairs in the male and with very short ones, inserted on small 

 punctures, in the female ; sides of thorax broadly, and pleurae more 



