FAM. 
MYCETOPHILIDiE 
small, hemispherical; metanotum liigh, arched. Abdomen of both sexes seven segmented, of the male 
cylindrical, constricted at the base, of tne female depressed, the median segments widened. Legs long, 
slender, the hind tibiae longer than the corresponding tarsi; tibiae with short spurs; the fore tibiae without 
lateral setae, the hind pair with three rows of short and slender setae, those on the flexor surface sparsely 
placed. Wing large, hairy, w-ith rounded base, placed flat on the abdomen when at rest, longer than the 
abdomen. Subcostal vein represented by a tooth, very short; K2-1-3 arises proximad of the fork of the 
media; media arises apparently at the R-M crossvein; cubitus forks slightly proximad of the M-Cu cross- 
vein ; anal vein prolonged to the margin (PI, 3i Fig. 8). 
Type species : D. fasciata, Meigen. 
Geographical distribution of species : 
1. D. euzona, Loew, Berl. Ent. Zeitschr. Vol. i3, p. i3o (i) (1869). Eastern United States. 
2. D. fasciata, Meigen, Syst. Beschr. Vol. i. p. 23o (2) [Mycetobia) (1818). Europe. 
fasciata. Winnertz. Verh. Zool.-bot. Ges. Wien, Vol. i3, p. 669 (1) (i863); 
Schiner, Fauna Austr. Dipt. Vol. 2, p. 428 (i) (1864I. 
trifasciaia, Winnertz, Stett. Ent. Zeit. Vol. 7. p. i5 (1846). 
3. D. ikce?ia, Bigot, Mission Scient. Cap Horn, Zool. Vol. 6, p. 16(24) (1888). South America. 
4. D. macroptera, Winnertz, Stett. Ent. Zeit. Vol. i3, p. 64 (2) (i852j; Europe. 
Verh. Zool.-bot. Ges. Wien, Vol. 13, p. 669 (2) (1893). 
macroptcra, Schiner, Fauna Austr. Dipt. Vol. 2, j). 428 (1) (1864). 
— D. trifasciaia, Winnertz, see fasciata, Meigen. 
4. Genus SYMMERUS, Walker 
Symmerus. Walker, List Dipt. Brit. Mus. Vol. i, p. 88 (1848). 
Plesiastina. Winnertz, Stett. Ent. Zeit. Vol. i3, p. 55 (4) (i852). 
Centrocnemis. Philippi, Verh. Zool.-bot. Ges. Wien, Vol. i5, p. 619 (4) (i865). 
Characters. — Head, thorax, abdomen and legs as with Ditomyia. Eyes reniform, somewhat 
approximated on the vertex; ocelli three, the median smaller, placed in a wide triangle on the vertex; 
palpi four jointed, the first joint very small, the others subequal in length, the second enlarged, ovate, 
the others cylindrical, face hairy; antennae projecting forward, arcuated, 2 -\- iS jointed, the basal joints 
cupuliform, narrower than the basal joints rjf the flagellum. the flagellar joints flattened, broad, the 
terminal joint very small. Fore tibiae on the inner side with several slt nder setae, the hind pair as with 
Ditomyia. Wing resembling that of Ditomyia but differs in having a shorter Rz+a, the base of which is 
somewhat distad of the fork of the media, and the costa ends at the tip of R44-5 (PI. 3, Fig. 9). 
Type species : .S. atniulaia, Meigen. 
Geographical distribution of species : 
I. 5. annulata, Aleigen, Syst. Beschr. Vol. 6, p. 294 (3) [Mycetobia) (i83o). Europe. 
anitidala. Winnertz, Verh. Zool.-bot. Ges. Wien, Vol. i3, p. 670 (i) (i853); 
Schiner, Fauna Austr. Dipt. Vol. 2, p. 429 (1864). 
a/^icalis, Winnertz, Stett. Ent. Zeit. Vol. i3, p. 56 (2) (i852); Schiner. 
Fauna Austr. Dipt. Vol. 2. p. 429 11S64). 
fernigiuea. Walker, List Dipt. Brit. Mus. Vol. i, p. 88 (Symmerus) (1848). 
flava, Zetterstedt, Dipt. Scand. Vol. 9, p. 3447 (7) [Ceroplatus) (i85o); 
Winnertz, Verh. Zool.-bot. Ges. Wien, Vol. i3, p. 688 (i863). 
pallida, Giglio-Tos, Boll. Mus. Zool. Anat. Comp. Torino, Vol. 5, No. 84, 
pi. 2, f. 5 [Ditomyia) (1890). 
vittata. Walker, Ins. Brit. Dipt. Vol. 3, p. 64 (3) (i856) (Ditomyia). 
— S. apicaJis, Winnertz, see annulata, Meigen. 
