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PACIFIC SCIENCE, Vol. V, April, 1951 
in evidence on the specimen at hand. The 
mesonotum is reddish with three narrow 
black vittae extending the full length — one 
down the middle and the other two in line 
with the dorsocentral bristles. The dorsal 
third to fourth of the pleura from the wing 
bases to the humeri are yellow, and the 
remainder is discolored with brown. The 
scutellum is all yellow except for a narrow 
brown band across the base. The metanotum 
is black, tinged with reddish in the middle. 
The halteres are reddish, tinged with brown. 
Legs: Chiefly yellow, tibiae tinged with 
brown. The middle and hind femora have 
two rows of short black bristles on the apical 
halves of the ventral surfaces. The hind tibiae 
have a row of short black bristles extending 
the entire length of the segment on the outer 
dorsal surface. The hind femora have a group 
of about 10 moderately strong black bristles 
arranged irregularly on the dorsal side near 
the apex. Wings: The large apical spot is 
joined with the transverse band across the 
middle of the wing in the lower portion of 
cell 1st M2 (Fig. 26). The apical spot occupies 
all of the distal portions of cells R5 and M2 
except for a narrow hyaline mark extending 
along the wing margin just above the apex 
of vein M3+4. The last section of vein M3+4 
from the m crossvein to the margin is com- 
paratively elongate; it is equal to or longer 
than the r-m crossvein. Abdomen: Chiefly 
rufous except for a broad black band at 
the base of the first tergum and for the narrow 
black ‘lateral margins of terga 1 to 5. The 
venter is entirely yellow to rufous. 
Length: Body, 7.0 mm.; wings, 6.0 mm. 
Female unknown. 
TYPE locality: Palmerston, West Aus- 
tralia. 
Type in the Deutsches Entomologisches 
Institut. 
The specimen at hand is from near Hart- 
ley’s Creek, N. Queensland, ex Clausena 
hrevistylus, Feb., 1950. 
Mr. May has informed me, in correspond- 
ence, that one specimen of Callistomyia 
horni is in Mr. Perkins’ collection from 
Cairns. 
CLUSIOSOMA Malloch 
Clusiosoma Malloch 1926. Linn. Soc. N. S. 
Wales, Proc. 51: 547. 
This genus is related to Themarohystrix 
Hendel and is distinguished by the more 
elongated antennae, by the absence of the 
pteropleural bristle and the presence of 
strong bristles on the middle and hind 
tibiae, by having the anterior two pairs of 
orbital bristles proclinate and incurved, as 
well as by other chaetotaxic characters re- 
ported by Malloch (1939^: 423). 
GENOTYPE: Clusiosoma semifusca Malloch. 
The two known Australian species are 
separated as follows: 
Facial spots present; mesonotum with a 
pair of submedian black vittae ex- 
tending the entire length from the 
outer scapular bristles to the hind 
margin and continuing over the 
Fig. 26. Callistomyia horni Hendel: wing of male. 
