506 Mr. J. E. Collin’s Description of 
tufts at tip of scutellum. <A fringe of similar very long bristly 
hairs extends from below root of wing to base of middle coxa, 
Abdomen rather darker than thorax, clothed dorsally and ven- 
trally and on basal segment of genital forceps with numerous long 
dark bristly hairs, especially long on hind-margins of segments. 
Legs yellow, but more or less obscured, especially on tibiae and tarsi, 
by a clothing of short adpressed scale-like hairs. Coxae, trochanters, 
and all the femora beneath, with rather long dark hairs. Tarsi 
very long and slender; ungues very small, bidentate, the lower 
tooth arising near the base, more slender and shorter than upper 
tooth; empodium absent or very short. 
Wings short and broad, the costal, subcostal, and cubital veins 
dark, the postical and postical folds much less distinct. Auxiliary 
vein present but inconspicuous, most easily seen when viewed from 
underside of wing, this vein bears about three small pores just in 
front of humeral cross-vein; subcostal vein with two similar pores 
at its junction with costa; cubital vein with a single pore at cross- 
vein and two others at about three-quarters of the distance to tip. 
The curved scale-like hairs on both upper and lower surface of wing 
point towards the base of wing. Halteres with dusky knobs clothed 
with narrow adpressed scales. ‘ 
®. Resembling the male, but antennae shorter, with the joints 
all simple, longer than broad, almost sessile, and without the looped 
hairs of the male; the bristles on these joints do not appear to be 
arranged in distinct whorls, though there appear to be some stronger 
bristles at the base of each joint, at least on the upperside. Abdomen 
terminating in a non-telescopic ovipositor, bearing two pairs of ovate, 
short-haired papillae. 
Length (not including antennae), very variable, from *5 mm. 
(some males) to 2 mm. (some females). 
[A description, on pp. 439-40, of the abundant material 
is followed by Farquharson’s account of the habits. The 
species was captured at Agege (152 ft.), 16 m. N. of Lagos, 
as well as at Moor Plantation, near Ibadan, 8. Nigeria. 
The Cecidomyids fly over the carton nests of Cremastogaster 
ants, and, approaching ants engaged in feeding others, 
endeavour, while hovering in the air, to abstract a portion 
of the regurgitated droplet. The ant was Crem. buchneri 
r. alligatrix at Agege, and near r. alligatrix at Moor Plan- 
tation.—K.B.P.] 
