46 SYRPHID #. 
Type 2, asingle specimen from Durban, Mitchell Park, 22.1.1903 
(FP. Muir). 
It is quite possible that B. helva is the female of the very 
dark-coloured B. neavez, described below. 
39. Baccha neavei, sp. n. 
3. Length of body 11 to 12 mm., of wing 9 to 10 mm. 
A species evidently belonging to the picta- group, but distin- 
guished from any other on ean of the wholly black coloration 
of thorax and scutellum ; in all probability, however, the unknown 
female will be found to be paler-coloured than the male. 
Head black ; face yellowish red, the middle tubercle more yellow, 
the sides with bluish reflexions and sparse tomentum, and Biko 
with some dark hairs; peristoma narrow, blackened behind ; frontal 
triangle shining blackish zneous, dark-haired; the not very pro- 
minent antennal tubercle is yellow towards the lunule and somewhat 
violet-coloured on the sides; vertical triangle very narrow, zneous 
black, black-haired ; occiput black, whitish-dusted, with a complete 
white fringe, darkened above; lateral margin of the eyes white ; 
antennze dark orange-coloured, the basal segments blackened, with 
bluntly ovate third joint and brown arista, which is, however, yellow 
at the base and sometimes shortly pubescent. Line of contact of 
eyes as long as the vertical triangle ; eyes apparently adorned with 
a single median dark band. Thee tea scutellum entirely metallic 
shining zeneous, with short pale hairs; humeri very narrowly 
reddish; pleure like the back, darkened above, clothed with 
slightly longer hairs. Squamulze yellow, with a short fringe ; 
halteres whitish. Abdomen very narrow, cylindrical, only slightly 
spatulate, wholly shining black ; third Sal fourth seoments with 
an oblique yellowish spot towards the middle of the sides, some- 
times fused to form a complete band; hair on the stalk very 
long and erect, otherwise short and dark. Genitalia black, grey- 
dusted and grey-haired. Front legs with the cox entirely pale 
yellow; middle legs with the femora blackened behind towards the 
base ; hind legs ath the femora black, yellow at the apex, and 
the tibize yellow ish with a more or less distinct subapical black 
ring. Wings less broad than in pieta, with black veins, the third 
and the seventh sinuous, the anal cell therefore irregularly shaped 
as in picta; wings blackish brown, but with hyaline alula, axillary 
cell, and hind border ; there is a narrow hyaline streak in the 
middle extending from the bifureation of the second and third 
veins to the third posterior cell; subcostal cell black; a broad 
hyaline preapical band anda broad apie: al brown spot extending 
from the end of the first to the third vein, and often even passing 
it more or less. 
Type 3 and two additional specimens from Lamoru Station, 
Uganda Rly., British East Africa, 9-10. it. 1911, 7,340 ft., col- 
lected by Mr. S. A. Neave, in Fayre honour the species is named. 
There is also a male specimen from Durban, 6. vi. 1903 (#. Aur). 
