436 On the Dipterous Subfamily Ditomyine. 
stripes, separated by narrower yellowish stripes, which curve 
outwards some distance behind the front margin and are 
there connected with elongate yellowish spots on the margin 
of the mesonotum just in front of the wing-base; the 
middle dark stripe is also divided by a narrow yellow line. 
Scutellum with four strong bristles. Pleurz and postnotum 
bare. Abdomen dark brown, the hind margin of each 
segment narrowly pale ochreous ; anal cerci yellow. First 
tergite with a group of four to six strong bristles at each 
side near the base. Legs ochreous, tibie and tarsi some- 
what darker. Hind coxe with several small bristles towards 
apex, two more near base, one longer and stronger one near 
the middle. Wings of normal shape, the tip not truncate ; 
venation as in A, hudsoni (Marshall), except that R,,;is not 
quite so strongly arched, and R,,3 is nearly straight, arched 
only at the base; costa scarcely extending beyond tip of 
4,5. No trace of scales can be seen, but macrotrichia are 
present over the greater part of the apical half of the wing, 
especially in the darkened areas. The stem of the median 
fork, the basal half of M,,., and the base of M, are rather 
faint, the remainder of these veins well-marked, dark brown, 
as are all the remaining veins—except for a short yellowish 
portion at the tip of R,,, and on the costa aboveit. A large 
dark brown spot over the base of Rs, and a smaller one 
round Cuyq; a dark fascia beyond the middle of the wing, 
darkest towards the costa, leaving a clear spot in the base of 
cell A,,,, and a clear streak along base of vein M,,., but 
extending basally along Cu, and apically along J, and on 
each side of M,,,. Some irregular dark clouds on the apical 
fourth of the wing. Halteres yellowish, base of knob dark. 
Length of body 8 mm.; wing 8x 2°8 mm. 
New Zeatanp: one female collected by C. M. Wakefield, 
1880; no exact data, but probably from Canterbury. 
Type in the Oxford Museum. ) 
The structure and coloration are both so very much like 
Marshall’s description of A. hudsoni that I have very little 
hesitation in referring this insect to the genus Arctoneura, 
in spite of the striking difference in the shape of the wing. 
Possibly the truncated wing-tip of A. hudsoni may be a male 
character only, or Marshall may have described a deformed 
specimen. The absence of scales on the wings, the rather 
different wing-markings, and the ringed antenne should 
suffice to distinguish A. wakefieldi from A. hudsoni, if either 
of the above suggestions should prove correct. 
There is in some respects an even closer resemblance 
to Casa tridens, Hutton, which, according to Marshall’s 
