PROCEEDINGS OF SECTION D. 527 
our knowledge reliable, except where the genera are readily 
understood, and limited in described species. 
Our described species are referred to rather more than 300 
genera, of which about 80, or a little more than one-fourth, 
are regarded as endemic; but these numbers will doubtless 
be somewhat modified on a careful investigation of the species 
themselves. 
This essay can only be a very incomplete sketch of the 
Australian Diptera, but at any rate it serves to show the present 
unsatisfactory state of our knowledge of this most prolific and 
interesting portion of our fauna; and may prove of assistance 
to entomologists who may be induced to come forward and 
devote some attention to one or more of the neglected families. 
There is an abundance of unnamed material in collections, and a 
plentiful harvest yet to be gathered. 
Section 1.—DIPTERA ORTHORHAPHA. 
Division I.—NEMATOCERA. 
The families falling under this division are probably as richly 
represented in Australia as in any other part of the world. Very 
little is known of the speoies occurring outside New South Wales, 
and the majority of them have been described from specimens 
obtained in the vicinity of Sydney. The Blepharoceride and 
Orphnephilide are the only families at present unknown. 
Fam. 1. CEcIDOMYIDA. 
Ninety-five species referred to fourteen genera have been 
described from Australia, or, more correctly, exclusively from 
New South Wales. Leteropeza, Winn., one; Miastor, Mein., 
two; Gontoclema, Sk., one; Cecidomyia, Loew, seven; Diplosis, 
Loew, forty-eight ; Asphondylia, Loew, two; Hormomyia, Loew, 
one; Vecrophlebia, Sk., one; Chastomera, 8k., one; Colpodia, 
Winn., one; Lfidosis, Loew, ten; Asynapta, Loew, three ; 
Lastoptera, Meig., seven ; and Campylomyza, Meig., ten. Most 
of these genera are of world-wide distribution ; and some of them 
occur in a fossil state in amber. Vecrophlebia, Chastomera, and 
Gontoclema have hitherto been found only in Australia. I know 
several undescribed species, belonging to four or five genera, 
among which is a species of Lestvemia. I am also imperfectly 
acquainted with the life-histories of several species, some of 
which form galls on the leaves and twigs of the Eucalypti. This 
family seems to be very abundant in Australia. 
For descriptions of the Australian species see Proc. Linn. Soe. 
New South Wales, vol. iii. (Ser. 2nd), 1888, pp. 17-144, pl. 2-3. 
Descriptions of all the known genera, and references to the most 
important papers treating on this group are given. 
