AERO, ATOR ne ee RN ir a “hs 
a new Genus and eight new Species of Diptera. 509 
collected by Farquharson as described on p. 442. It is 
easily distinguished by its straighter cubital vein ending 
at wing-tip, and the more ovate terminal lobes of ovipositor. 
In default of further material no attempt has been made 
to mount and describe this specimen. 
EPHYDRIDAE. 
Ruyncuopsitopa Hendel, Suppl. Ent., IH, 96 (1913). 
R. apicalis, sp. n. 
Frons, thorax and abdomen brightly shining, glassy, 
with metallic blue and violet reflections. No acrostichat 
bristles. Tip of wing darkened. 
39. Face shining yellowish with the projecting (clypeus-like) 
mouth-edge whitish. Palpi dusky yellow. Arista yellow at least 
about the base but the hairs dark. Scutellum duller than dise 
of thorax; upper half of pleurae dusted greyish, Thoracic bristles 
long, but no acrostichals; one pair of dorso-centrals at middle of 
thorax very long with 2-3 smaller somewhat incurved pairs in front 
decreasing in length as they approach front of thorax, and one pair 
(shorter than middle pair) behind, half-way towards scutellum ; 
a humeral, two notopleural, an up-curved posthumeral, two intra- 
alar (the hinder one very long), a small supra-alar, and two postalar 
bristles. Abdomen with long bristly hairs especially on the 3rd—5th 
segments. Front coxae, all tibiae, and tarsi except last 1-2 joints, 
yellow; rest of legs varying from yellowish- brown to black. Wings 
with the tip (including the end of the cubital and discal veins) 
darkened, and with a darkened patch on all the veins across the base 
of wing, opposite (and including) the humeral cross-vein. Halteres 
white with a dusky base to stem. 
Length about 2 mm. 
[Farquharson’s material included 2 3 3 9 examples of this 
species, captured between Dec. 25, 1917 and Jan. 26, 1918, 
at Moor Plantation, nr. Ibadan, §. Nigeria. They were 
feeding from the anus of dead Cremastogaster ants as 
described in Proc. Ent. Soc., 1918, pp. xxxv, xxxvi, xl. 
An observation made by Farquharson at a later date (see 
pp. 443-44) clearly shows that R. apicalis pursues the living 
ants with the same object.—E.B.P.]| 
The genus Rhynchopsilopa was distinguished from Psilopa 
Fallén by Hendel by reason of its long antennae, with the 
TRANS. ENT. SOC. LOND. 1921.—PARTS III, IV. (JAN. 22) LL 
