BY FREDERICK A. A. SKUSE. 
1379 
Antennie cylindrical, inserted beneath the eyes; 11 -jointed; 
third joint a little larger than the others ; last four joints little 
distinct one from another. Eyes hairy in the Prothorax 
elevated, with two ranges of spines. Legs hairy ; fore femora 
thick, grooved ; tibiie spined in front, and terminated with a 
coronet of eight spines ; tarsi with three pulvilli. No discoidal 
cell to the wings.” 
Obs. — Dilophus Joiigiroslris does not differ from the above in 
the number of the joints to the antennae, both ^ and 5 being 2- + 9- 
jointed ; but in D. pictipes (^) they are 2- -f- 7-jointed, the second 
basal joint globose and larger than the first joint of the flagellum, 
the last three joints of the latter being more closely united to one 
another. In D. longirostris the joints of the palpi are much more 
dilated than in D. pictipes, those of the latter being as follows : 
First joint small, cylindrical; second, third, and fifth joints twice 
the length of the first, rather thicker, the former two somewhat 
pyriform, the fifth joint oblong-oval ; fourth joint rather more 
robust than the rest, obovate. Ocelli three, arranged in a 
triangle on the front. Abdomen with eight segments. 
About fifty species are known. The genus has a wide distri- 
bution ; the majority of species stand I’ecorded from Europe and 
North and South America. 
187. Dilophus lokgirostris, Macquart. (PI. xxxix., fig. 7, 9 ). 
DilopJms longirostris, and 9 ), Macquart, Dipteres Exotiques, 
4th Suppl. 1850, p. 17, No. 4, tab. 1, fig. 8 . 
(J. — Length of antennae 0'020 inch 
Expanse of wings OdfiOxO'OfiO ... 
Size of body., 0’210x0'025 ... 
0‘50 millimetre. 
4 06 X 1-54 
5-33 X 0-62 
9 . — Length of antennae 0’018 inch 
Expanse of wings 0'180 x 0‘065 
Size of body 0’200 x 0 030 
0‘47 millimetre. 
4'5G X 1 ’66 
5 08 X 0‘7G 
