1020 REPORT OF THE HARVARD AFRICAN EXPEDITION 
The African species of Ceratocheilus may be separated by the accompanying 
key: 
1. Wings unspotted. 
(West Africa) gilest Edwards. 
Wines spotted or clouded with darkets:....2c.00204.¢.00seece0-4e¥naceb cok oon 2, 
2. Anterior branch of Rs very short and straight so that cell R.is almost triangular in outline; 
a series of four equidistant brown spots in cell MW; rostrum light yellow. 
_ (Ivory Coast, Cameroon) flavirostris Alexander. 
Anterior branch of Rs longer, cell Ry not triangular in outline; no series of brown spots in 
eal) ME mostrumaedanle . . . «ysis ais ccs eda ew gab ee ey ee ee 3. 
3. Anterior branch of Rs very long, subequal to the combined Rs and basal section of Rs; 
wing-pattern very heavy, dark brown, including a large U-shaped mark at tips of Sc 
and FR, + 2, this extending caudad to vein M or virtually so; a heavy dark area at 
arculus reaches costa. 
(Southern Nigeria, Cameroon) edwardsi Alexander. 
Anterior branch of Rs shorter; wing-pattern less distinct, the area at tip of Sc not ex- 
tended caudad to vein M; arcular area, when present, small and not reaching costa. 4. 
4, Wing-markings faint; no brown spot surrounding Se». 
(Seychelles) seychellarum Edwards. 
Wing-markings more distinct; a brown spot surrounding Scey.............0002200 eee D. 
5. Atleast three dark brown areas reach costa, situated at tips of Sc:, Ri +»and R3; rostrum 
longer (in male, about 5 mm.). 
(Liberia to Belgian Congo) longirostris Wesché. 
A single dark costal mark, placed at tip of Ri + 2; rostrum shorter (in male, about 3 mm.). 
(Southern Nigeria to Belgian Congo) cornigerum (Speiser ). 
Ceratocheilus flavirostris is the most distinct of the Ethiopian species. The 
remaining five represent a closely allied group that are separated chiefly on de- 
tails of the wing-pattern, being arranged in the following order, from the first, 
with immaculate wings, to the last with the most heavily patterned wings: gilesz, 
seychellarum, cornigerum, including winn-sampsont Wesché, longirostris, includ- 
ing nigripleura Alexander, and edwardst. 
Styringomyia liberiensis, new species 
Text Fig. No. 10, 18 
Male. — Length about 7-8 mm.; wing 5-5.5 mm. 
Female. — Length about 6 mm.; wing 4.6—4.7 mm. 
Described from alcoholic specimens. 
Allied to S. annulipes Enderlein (East Africa, Madagascar, Seychelles), S. occidentalis Edwards 
(Gold Coast), and S. mahensis Edwards (Seychelles) { in the prominent lateral shoulders on the 
ninth tergite of the male hypopygium, differing especially in the details of structure of the hypo- 
ium. 
me Antennae with both scapal segments black, the flagellum yellow. Head dark. Mesonotum 
chiefly pale, variegated with dark lines. Legs yellow, the femoral and tibial rings narrow and 
relatively ill-defined, the femoral rings much narrower than the pale ring enclosed. Wings yellow, 
with a sparse brown pattern, as in annulipes; anterior branch of Rs entirely pale; vein 2nd A 
spurred at origin. Abdomen chiefly pale, variegated, especially caudally and laterally, with 
brown. Male hypopygium (Fig. 10, 13) with the lateral shoulders of the ninth tergite nearly straight, 
blackened only at tips, clothed with setae to the blackened portions. In mahensis and allies the 
shoulders are blackened almost to their bases, setiferous only on the proximal portion and strongly 
incurved. Ninth sternite narrowed to the simple apex, bearing two long approximated setae. 
Basistyle with the lateral apical lobe long, fully one-half the length of the apical seta. In mahensis, 
the lobes are very short, much less than the weak apical seta. The complex dististyle is about as 
figured, the details quite distinct from mahensis and allies. 
