Bombyludae (Diptera) from Central Africa. 623 
The dark portion of the wings is not so sharply limited, and is 
variegated with clearer streaks; the dark spot at the base of the 
third posterior cell is isolated ; upper branch of the cubital fork very 
strongly bent ; anal cell broadly open, and with the apical half 
hyaline (not the apex alone as in A. homogeneus). Prediscoidal spot 
clear. 
Type ¢ and. another specimen from North Nyasa, 
Akamanga, South Rukuru River, October 8, 1909 (Dr. J. B. 
Davey). Three other specimens taken in the same locality 
by the same collector, October 10, 1909, are less typical. 
30. Anthrax pusillus, Wiedemann (1821). 
This species also has not previously been recognised as an 
Argyramoeba in the catalogues. It is near A. lewcogaster 
and volitans, but this last shows white hairs on the side of 
the abdomen. The two brown clouds of the wings are 
often indistinct. After the small cross-vein, the border 
of the dark portion of the wings shows a deep hyaline 
indentation. 
Three specimens from North Nyasa, Nyungwi stream, 
November 26, 1909, and Karonga to Fort Hill, near 
Lufira River, May 30, 1909 (Dr. J. B. Davey). 
11. Villa, Lioy (1864). 
The old genus Anthrax of authors, which, however, 
cannot retain this name, must be divided into several 
smaller genera. 
The species of the Old World can be divided into the 
three following groups :— 
1 (4). Face rounded ; third joint of the antennae short. 
2 (3). Very like Anthrax (Argyramoeba) in appearance, colouring 
and wing-pattern ; pulvilli often present ; larvae living on 
parasitic Diptera or Hymenoptera . Hemipenthes, Loew. 
3 (2). Species not closely resembling Anthrax ; pulvilli always 
wanting ; wings without dark pattern, mostly wholly 
hyaline ; larvae parasitic on Lepidoptera . Villa, Lioy 
4 (1). Face conically prominent ; third joint of the antennae elon- 
gate ; pulvilli wanting ; wing-pattern normally present ; 
larvae preying on the egg-cases of locusts 
Thyridanthraax, Ost.-Sack. 
Of the first group there are no species in the collection 
before me. 
The second group, Villa, is the one which was called 
