ACALYPTRATES. 
61 ? 
The classification of both Acalyptrates and Calyptrates is in an un¬ 
settled condition, as various authorities interpret in different ways the 
systematic value of the sub-divisions and assign them different limits. 
The boundaries of the “ families ” are of an indefinite nature, and correct 
identification is often a matter of very considerable difficulty. The 
table given below will, however, enable the student to arrange in order 
the majority of the Muscoids with which he is likely to meet. 
ACALYPTRATES 
Hymenopterous-looking flower-flies, usually of a 
fair size, with broad head and generally long 
antennae proboscis and abdomen, the latter 
swollen at the end. 1st posterior cell distinctly 
narrowed or closed 
Flies with very long awkward legs, long body, 
1st posterior cell narrowed or closed. Wings 
generally with dark markings 
Small shiny black purple or orange coloured flies 
with narrow waist, generally found near excre¬ 
ment. Wings often with a spot 
Eyes on horn-like projections 
Small bare flies with thickened femora and very 
large scutellum 
Look like Chrysomelid beetles 
Small sea-shore flies with flat horny thorax and 
bristly head 
Small dung-flies with 1st hind tarsal joint flat and 
shorter than the 2nd, and with characteristic 
venation 
Small decay-flies with arista plumose on the 
upper side (generally with only a few long hairs), 
and the lowest bristle on the front pointing 
downwards 
Conopids. 
Micropezids. 
Sepsids. 
Diopsids. 
R h opal ome rids. 
Celyphids. 
Phycodromids. 
Borborids. 
Drosophilids. 
Not as above. 
A.—Sub-costa entirely absent or incomplete, or not 
having its junction with the costa distinct. R f 
