340 Dr. C. P. Alexander on 
pale brown; tarsi pale brown, only the terminal two or 
three segments darker brown and somewhat inflated ; claws 
long and slender, with a very long, erect basal tooth and 
a shorter appressed tooth beyond mid-length. Wings with 
the cephalic half hyaline, fhe caudal cells strongly suffused 
with brownish grey, the membrane with a heavy dark brown 
pattern including six costal blotches; costal cell largely 
darkened ; cell Sc largely pale, traversed by the first, third, 
and fourth brown blotches ; the first of these areas occupies 
the arculus ; the third at the origin of Rs, almost reaching 
vein Jf; the fourth, largest, occupies the end of vein Se 
and passes through cell lst R, to beyond the fork of the 
sector ; the fifth blotch occupies the end of vein FR, and 7, 
and attains vein R,,,; the last bloteh occupies the ends of 
cells 2nd R, and R;; slightly paler but broad seams along 
the cord and outer end of cell 1st M, and as seams along 
veins R,,;, M, and Cu; dark clouds at the ends of veins 
Cu,, Cuz, 1st A and 2nd A, and in the anal angle of the 
wing; veins dark brown. Venation: Se very long, Sc, 
ending just before the fork of Rs, Sc, at the extreme tip of 
Sc,, and exceeding it in length; Rs long, strongly arcuated 
at origin; 7 retreated back from the tip of R,, so that R, 
beyond r is about half again as long as7; cell lst J/, closed ; 
basal deflection of Cu, before the fork of MZ. 
Abdomen dark brown. Male hypopygium rather large 
and complicated in structure for this genus of flies. Ovi- 
positor with the valves short, the tergal valves slender, 
strongly upcurved ; sternal valves transversely flattened and 
connected with one another by a membrane. 
Hab. West Africa. 
Holotype, 8, Lonji, about 50 miles north of Kribi, near 
the Ulou River, Cameroun, altitude about 1C00 feet, 
July 17, 1919 (J. A. Reis). 
Allotopotype, ¢ . 
This handsome fly is undoubtedly related to D. recurvans, 
Alex. (Los Islands), but is readily told by the wing-pattern 
and venational details. The two species form a distinct 
group of the genus, in which 7 is at some distance from 
the tip of R,, and the female ovipositor shows a peculiar 
specialized structure. The recently described D. trigonia 
(Edwards) of Sumatra (Journ. Fed. Malay States Mus. 
vol. vill. pt. 3, pp. 15,16; July 1919) is evidently another 
member of this peculiar group. 
