128 
1 (2) 
SYRPHID-E. 
Knutirely black and elongate species, 
more than 20 mm.in length; antenna 
and legs black, but the latter some- 
times of a reddish colourin the male; 
abdomen elongate, the second sey- 
ment produced on each side, very 
thinly punctate ; third antennal joint 
halfasiloneas the inst 2.8 Se) 8 
2 (1) Less elongate species, not more than 
3 (4) 
4 (5) 
5 (8) 
6 (7 
TONS 
8 (6 
9 (10) 
10 (9) 
12 (11) 
18 mm. in length, the abdomen 
broader than the thorax at the base 
and conical, its second segment always 
simple; not entirely black, the abdo- 
men, head, antenne, or legs being red 
or yellow; third antennal joint about 
as long as the first. 
Abdomen black; head, antenne, and 
legs iawhellymedst saitgus.. Lee. Leet. 
Abdomen yellow or red; antenne 
black; head black or with the face 
alone yellow. 
Legs wholly black; face yellow ; first 
and second antennal joints clothed 
with rather long hair; rather pro- 
minent species of larger size. 
7) Abdomen yellow ; Hastern species .... 
Abdomen red; Western species 
) Legs wholly or mostly red or yellow ; 
face black; first and second antennal 
joints almost bare; smaller and less 
pilose species. 
lind legs partly black; the two first 
antennal joints of a dark reddish 
colouxs.. .F. «+. & 5.019 0.6.5 .0.0 cdc nO 
Hind legs entirely red or yellow; 
antenne entirely black. 
Abdomen and legs dark red; wings 
with a uniform bluish-black tinge ; 
trochanters and pleure black ; arista 
reddish, 
Abdomen and legs pale yellowish red ; 
wings infuscated along the veins 
alone ; trochanters yellowish ; pleurze 
sometimes spotted with yellow ; arista 
blaelosetwe ft: ; 
135. Microdon mydas, sp. 
mydas, Sp. 0. 
erythrocephalus, sp. n. 
lutetventris, sp. n. 
erytiros, Bezzi. 
etiiopicus, Rond, 
tnermis, Loew, 
pallidus, sp. n. 
n. 
3 2 Length of the body in the male 19 mm.; in the female 
21 mm., excluding in each case the antenne, which are 5 mm. 
long. 
A wonderful dull black species of considnrable size, resemblin 
ga 
Mydas, and exhibiting some of the characters of the preceding 
group, with which it forms a connecting-link. 
The two sexes show remarkable differences in coloration. 
IT will 
