-.,,/L46
THREE

INsEcUToRINSCITI.&MENSTRUUS

rNSEcuroR rNscrTr.E MENsTRUUS

UNDESCRIBED NEMATOCEROUS FLIESFROM NEW ZEALAND(Diltra)Bv CHARLESP. ALEXANDER

Two of the three speciesof Diptera describedherewith weresentto me by Messrs.Harris and Howes,to whom my sincere
thanks are extended. The types are preservedin the writer'scollection.
Family RHYPHIDAE
Trichoccra obtusicornis, new species.
Male.-Length about p.6 mm.; wing 3 mm.
Female.-Length P.S-2.8mm.; wing 8.4_8.?mm.
Generallysimilarto T. maori Alexander,differingas follows:
Size smaller. Generalcoloration (in alcoholicspecimens)
much paler brown, the pleura pale brownish testaceous.Wings
pale brown, the stigma lacking. Venation: Sc, oppositeaboirt
one-third to one-fourth the length of .Rs,. rn faint, much
shorter than the petiole of cell Mr. Male hypopygiumwith thepleural appendages
lesselongate.Gonapophyses
smooth. penis_guard terminating in obtuse horns, the apex of eachwith avery shallowincision,Habitat.*New Zealand(North Island).
Holotype,6, Ohakune,altitudep,060feet,
July,l92I (T. R.
Harris).
Allotofotypo, Q.
Paratopotypss,B g,s.
Trichocera lobifera, new species
Male.-Length 3 mm.; wing B.Bmm.
Female.-Length g.A mm.; wing B.d mm.
Generalcolorationof alcoholicmateriarpare brownish
yellow' Antennaeof the female but little shorter
than those of
the male. Wings tinged with yellowish grey; stigma
faint.
Male hypopygium with the pleural appendageelongatg onthemesal face at from one-third to one-fourththe lengtha con_
spicuous,glabrous perpendicularlobule mesal faceof ap_I
pendage distad of this lobule with abundant
short setae.

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Gonapophysesand penis-guard appearing
as slend.er, chitinizedrods.
of ovipositor fleshy but ,"th., elongate.
_Valves
H abitat.-New Zealand.( Souih Istand),
Holotype, 6 , I,ittle River, \4ount Fitzgerald,
altitude 1,800
feet, January 24,I}ZZ (E. S. Gourlay);il. R.
Allotopotyps, 9 .
The types were associated with Motophilus
luteifygus Alex_ander and M. bsnhsianrzs Alexander,,hr.. ,p..i", f.i"gpreyed upon by a small speciesof"UEmpididae.

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Family DIXIDAEThe only Di,ra so far clescribed from,New Zealand isD. cantpbelli Alexander._ This may be
the speciesmentioned,but
described, by Marshalllirans. N. 2. I,nst., vol. Zg,_notp.222, 1896), or the latter may have pertained
to some otherstill undescribed form.
Dixa otagensis, new species.
Male,*Length 8.6 mm.; wing 4.5mm.
R-ostrumand palpi black. Anlennaeand head black.
Mesonotum brown, the color almost
olr.ur.a- Uy--rh" u.r,
broad black stripes on.the^praescutal
region, ,"uottrr_ p"t.
brown; postnoturn black. pleura black,tie *er"pimerqn andthe lateral sclerite of the postnotum
obscure brownish yellow,
brightest ventrad of the wing-root. Halteresbrown, the extreme
baseyeilow, the knobs darker.
Legs with the coxae brown, theposterior coxae more yellowish;
trochanters yellow ; remainderof the legs black. Wings with a faintbrownish tinge, more
pronounced in the costal region;a brown cloud, at-the r_yn
cross-vein; veins dark brown. Venation:
Sr, endins imm._
diately before the origin of .Rs,.r-tu
connecting with Rs a little
Iess than its own iength before thefork; rn-cu a little morethan its_own length beyond r_m;cell'M, deepet th;-i;
D. campbelli
Abdomen dark brownish black.
H abitai.-New Zealand (SouthIsland).
Holotype, d, Ben Lomond, Otago,Oi."*1..
80, 1921 (G.
Howes).
Paratoltotype, Sex?.