S86 REPORT OF THE HARVARD AFRICAN EXPEDITION 
There are some curious contradictory statements in the literature concerning 
the genotype, Pangonia bifasciata. Miss Ricardo in 1900 (Ann. Mag. Nat. 
Hist., (7) V, pp. 105 and 108) wrote that the male in the British Museum “‘has 
a prolongation on the second joint of the fore tarsi, reaching to the end of the 
third joint, with long hairs on its apex.” In a later paper (1914, Ann. South 
Afr. Mus., X, p. 448), she describes the male as having “‘no prolongation on the 
second joint of the tarsi.” Enderlein says that in Ommatiosteres the two basal 
segments of the fore tarsi are normal in the male. 
Ommatiosteres appears to be strictly Ethiopian and contains the following 
species: Pangonia bifasciata Wiedemann (1821), Pangonia brunnipennis Loew 
(1858), Pangonia bukamensis J. Bequaert (1913), Ommatiosteres caffrica Enderlein 
(1925), Corizoneura dissimilis Ricardo (1914), Pangonia fuscanipennis Macquart 
(1855), Pangonia spiloptera Wiedemann (1821), Pangonia subfascia Walker 
(1854), and Pangonia sulcifrons Macquart (1855). Of the other species included 
by Enderlein, Corizoneura albifacies Ricardo (1914) and Pangonia leucomelas 
Wiedemann (1828) have ocelli and consequently belong in Buplex; Pangonia 
flavipes Macquart (1838) is described as having the first posterior cell closed and 
should be placed in Metaphara; Pangonia lateralis Fabricius (1805), has the 
face distinctly snout-like (as recognized by Austen and shown by a male before 
me) and is a Nuceria; Cadicera flavicoma Austen (1912), Corizoneura obscura 
Ricardo (1908), and Cadicera speciosa Austen (1912) appear to belong more 
properly in Phara (where they were placed by Austen) and form perhaps the 
transition between that genus and Ommatiosteres. 
Ommatiosteres bukamensis (J. Bequaert) 
Pangonia bukamensis J. Bequaert, 1913, Rev. Zool. Afric., III, 3, p. 227 ( 9; between Bukama 
and Sankisia, Katanga). 
This species is known only from the type. 
Female. — Black, with white apical margins on the first five or six abdominal segments dorsally 
and ventrally; the bands slightly broadened medially on tergites two, three, and four. Legs pale 
brownish-red. Antennae brownish-red at the base, the third segment almost entirely black. 
Wings clear, with yellow veins and stigma, and tinged with yellow along the costal margin and in 
the basal half. Length, 12 mm. 
Male unknown. 
Enderlein (1925, Mitt. Zool. Mus. Berlin, XI, 2, p. 365) includes this species 
in his genus Siridorhina (which is identical with Nucerta Walker), but this must 
have been due to an oversight. The description states plainly that the face is 
not swollen into a snout, but at most slightly convex in the middle, and without 
shiny callosities. The proboscis is about as long as head and thorax together. 
There are no ocelli and the eyes are bare. Both first and fourth posterior cells 
are broadly open at the margin. 
Nuceria Walker 
Nuceria Walker, 1850, ‘Insecta Saundersiana,’ I, Dipt., p. 7. Type by designation of Coquillett 
(1910): Pangonia longirostris Hardwicke, 1823. Not Nuceria Enderlein, 1922, which equals 
Philoliche Wiedemann. 
