ENTOMOLOGY 901 
Chrysops longicornis Macquart 
Chrysops longicornis Macquart, 1838, ‘Dipt. Exot.,’ I, 1, p. 156, Pl. XIX, figs. 2 and 2a ( 2; Sene- 
gal). Austen, 1909, ‘Illustr. African Blood-Suck. Flies,’ p. 44, Pl. II, fig. 10( 9 #). J. Bequaert, 
1913, Rev. Zool. Afric., II, 3, p. 220, fig. 1 (9). Kréber, 1927, Zool. Jahrb., Abt. Syst., LITT, 
pp. 180, 187, and 254, Pl. IV, fig. 37; Pl. V, fig. 20; Pl. VI, fig. 9( 9). 
Chrysops tarsalis Walker, 1848, ‘List Dipt. Brit. Mus.,’ I, p. 200 ( 9; Sierra Leone). 
Chrysops trimaculatus Bigot, 1892, Mém. Soc. Zool. France, V, p. 607 (<’, erroneously described 
as 2; Senegal). 
LipErtA. — Reppo’s Town, one female, resting on the under side of a leaf 
in a bush, at about 7 a.m., August 31, 1926. Moala, one male, also resting on 
the under side of a leaf in a bush, November 4, 1926. Gbanga, one female also 
sitting on a leaf, September 14, 1926. 
BELGIAN Congo. — Ile des Princes near Boma, one female. Coquilhatville 
(J. De Riemaecker). Zambi (Neefs). Malela, June 1915 (H. Lang and J. P. 
Chapin). 
This species appears to be distributed over most of the Ethiopian Region 
from the Senegal, Uganda, and Kenya Colony to Natal. 
The color of the abdomen is variable in this species. In the palest specimens 
it is dorsally almost entirely reddish yellow (more straw yellow on the second 
segment), with the first tergite entirely black and an inverted cordiform black 
spot in the middle of the second tergite (sometimes very small). In the darkest 
specimens the dorsum of the abdomen is black, except for two large, triangular, 
pale straw-yellow, lateral spots which unite narrowly in the middle at the an- 
terior margin. These extreme variations occur in both sexes and are connected 
by intermediary combinations of black and yellowish red on the dorsum of the 
abdomen. Austen (1909) figures a form which is about midway between the two 
extremes. The variations are found together and do not seem to be in any way 
geographically segregated. The palest specimen I have seen came from the 
Congo rain forest at Coquilhatville; the darkest, from the rain forest of Liberia. 
The eye markings in life of both sexes are shown in Text Fig. No. 8¢ and 8d. 
Notwithstanding this variability in color, C. longicornis is not connected by 
transitional forms with C. funebris Austen, as I shall show under that species. 
Chrysops funebris Austen 
Chrysops funebris Austen, 1907, Ann. Mag. Nat. Hist., (7) XX, p. 507 ( 9; northeastern side of 
Lake Edward, Uganda); 1909, ‘Illustr. African Blood-Suck. Flies,’ p. 44, Pl. II, fig. 9 (¢). 
Chrysops longicornis var. funebris Kréber, 1927, Zool. Jahrb., Abt. Syst., LIII, pp. 180, 187, and 
257, fig. 14; PL. IV, fig. 38 ( 9 7). 
BELGIAN Conao. — Barumbu, one female resting on a leaf, January 6, 1927. 
Bena Bendi (R. Mayné). Between Beni and Lesse (Murtula). Uere River 
(J. Rodhain). Moto (L. Burgeon). 
I cannot follow Kroéber when he regards C. funebris as an extreme melanistic 
variant of C. longicornis. Notwithstanding the considerable variation exhibited 
by C. longicornis, I have had no difficulty in separating C. funebris by the charac- 
ters given in the key. Moreover, the species appears to be restricted to the rain 
forests of the West African Subregion (not being generally distributed, like C. 
