172 
PACIFIC SCIENCE, VoL V, April, 1951 
of the cell. The brown coloring is rather 
faint in cell M4 and indistinctly separates 
off three hyaline areas extending from the 
wing margin through the cell. The anal cell 
is hyaline except for a fumosity just below 
the anal vein. The squamae and fringe are 
largely black. Abdomen: First tergum yellow. 
Terga 2 to 4 are yellow to rufous in the 
middle, black on the sides. Fifth tergum all 
black, just faintly rufous in the middle. 
Ovipositor: Rufous and very conspicuous. The 
exposed portion is approximately two times 
longer than the remainder of the abdomen. 
The details of the piercer and inversion mem- 
brane have not been studied. 
Length: Body, 5.0 mm.; wings, 6.0 mm. 
TYPE LOCALITY: Caims, North Queensland. 
Type in the Deutsches Entomologisches 
Museum. 
One specimen was in the Krauss collection 
from near Babinda, Queensland, Dec. 2, 1949. 
Acanthoneura bicolor 
(Macquart) new combination 
Urophora hicolor Macquart 1855. Dipt. Exot., 
Suppl. 5: 144, pi. 7, fig. 7. 
Rioxa hicolor Hendel 1928. Ent. Mitteil. 
17(5): 352. 
Kioxa hicolor Mai loch 1939. Linn. Soc. 
N.S. Wales, Proc. 44(3-4): 436. 
This species was not represented in the 
Krauss collection but its status was clarified 
during the course of this study and the 
information should be of value here. 
The species described here as Rioxa confnsa 
n. sp. was thought to be the same as hicolor 
(Macquart) and specimens were sent to Mr. 
J. E. Collin, Newmarket, England, for com- 
parison with Macquart’s type. Mr. Collin 
provided the following information in cor- 
respondence: 
In reply to your enquiry I give you below 
some details of the specimens standing under 
the name of Urophora hicolor in Bigot’s collec- 
tion. The one which appears to be the actual 
type (bearing a label in Macquart’s hand- 
writing) is not in very good condition, having 
the appearance of being originally preserved 
in spirit, and though described as a female, is 
actually, I am practically certain, a male with 
some extraneous matter stuck on to the end 
of the abdomen. With this type there are two 
other males apparently added later, which are 
certainly the same species, and were labeled by 
Macquart ""Urophora hicolor Male, Aus- 
tralia.” 
All these specimens are somewhat like 
those you sent me in wing markings, but en- 
tirely different in other characters, as noted 
below: — Arista practically bare. Face with an 
obvious median "keel” complete from lunule 
to mouthedge, quite narrow between anten- 
nae but rapidly widening out, leaving quite 
deep antennal foveae on each side. Frons 
wider than in your species, having two pairs 
of reclinate upper orbital bristles (front pair 
the longer) and only one pair of incurved 
lower orbitals, also numerous setulae scattered 
all over frons. Thorax tawny-yellow with four 
blackish stripes, middle pair wider than outer 
pair, and wider apart than they are from the 
outer ones. Scutellum tawny-yellow on a 
middle stripe but otherwise shining blackish 
except at extreme basal corner. Six equally 
strong scutellar bristles. A pair of prescutellar 
acrosticals and dorsocentrals, all equally 
strong, the latter placed slightly more an- 
teriorly, and behind each of them (close to 
scutellar suture) a transverse row of about 
three much smaller bristles, a humeral, two 
notopleural, two supra -alar, and one postalar 
bristle, apparently no posthumeral or pre- 
sutural. Heurae yellow except metanotum 
which is blackish, bristles and all hairs black 
except latter on prothoracic episterna. Abdo- 
men blackish at least towards tip, but stern- 
ites, and hypopygium beneath, of the same 
tawny-yellow colour as thorax. On wings the 
hyaline patches on each side of outer cross- 
vein are slightly more widely separated than 
in Macquart’s figures, and that on basal side 
of cross vein may be divided into two spots. 
Anal vein bent as in your species, but lower 
point of anal cell even longer. Insect larger 
and rather stouter than in your species, about 
7 mm. 
From these data it appears that Macquart’s 
species belongs in the genus Acanthoneura. 
