THE MYCETOPHILIDA. 101 
Antenne 10-16-jointed, porrect and simple; pronotum small ; 
scutum of meso-thorax undivided : wings and halteres present except 
in Zpidapus ; the discal areolet wanting, veins few ; abdomen, seven 
segments, rarely eight ; legs formed for leaping ; coxz large ; tips of 
tibiee armed with large spurs ; bristly hairs are developed on the legs, 
which are not, however, macrochetz.* 
Fic. 18.—Boletina dubia. 
Classification of Mycetophilida. 
The family is now divided into eight sub-families, which are given 
below in tabular form : 
A. Middle transverse vein elongated. 
a, Brachial vein wanting. 1. Diadocidine. 
8. Brachial vein present. 
I. Antennz not very long. 
a. Brachial vein long. 2. Mycetobina. 
aa. Brachial vein short. 3. Ceroplatine. 
II, Antenne very long. 
6, Antenne setiform. 4. Bolitophiline. 
. 6b. Antenne filiform. 5. Macrocerine. 
B. Middle transverse vein not elongated. 
: a, Brachial vein present, legs long. 6. Sciophiline. 
8. Brachial vein wanting. 7. Mycetophiline. 
* The Nematocera are characterized by the total absence of macrochetz. The 
stouter hairs on the thorax and scutellum of Cz/ex and on the legs of the Myceto- 
philida, Osten-Sacken tells us, ‘‘ can hardly be considered as such” (An Essay 
of Comp. Chetotaxy, Tr. Ent. Soc., Lond., 1884, Pt. 4). Continuing, he tells us 
“The Culicidz, Chironomid and Tipulidz are distinguished by the development 
and sexual differentiation of the antennz, which are in this case very probably the 
organs of orientation. The same conclusion may be arrived at with regard to the 
? 
Cecidomyidz and Mycetophilide.” The difference, however, between the bristly 
hairs on the legs of ‘* Fungus Gnats” and the typical macrochetz of the Muscide 
seems to be very slight. On the legs of certain M/ycetophilide and Cecidomyiade I 
have found curious club-shaped hairs ; what their function is I do not know. Mr. 
Dale thinks they are probably to assist them in leaping. 
