314 Transactions. 
pieces. Whichever view be taken, it is quite probable that the two 
structures are homologous.* 
Limnophila hudsoni n. sp. (Figs. 56, 162.) 
Head dull brownish-grey. Front one-sixth as broad as head. Rostrum 
about as long as head. Palpi rather long, blackish. Antennae alike in 
both sexes, about as long as head and thorax together; scape ochreous ; 
flagellar joints slightly enlarged at base, with short pubescence and rather 
short verticils, all black at base and ochreous towards tip, last few joints 
almost all black. Thorax dull-brownish, mostly grey-dusted ; praescutum 
with indistinct darker markings; pronotum and scutellum lighter. No 
tuberculate pits; pseudosutural foveae very small, oval, close to margin 
of praescutum. en rather dark brown. Hypopygium as in figure ; 
ninth sternite large, extending across ventral surface, and distinctly separate 
from tergite at sides, at least apically. Side-pieces with pubescent basal 
lobes, which are emarginate but not deeply split. Apparently two pairs 
of large parameres, of very different form; penis large and very broad. 
| rown; femora with dark-brown ring close before tip, and another 
one, rather feebly marked, anterior to this. Tibial spurs as in L. atheti. 
Wings with ground-colour milky-white; cells C, R}, and M, and greater 
part of cells M,, M,, M,, and Cu,, light brown ; dark-brown markings as 
in figure; note that the first two spots do not reach the costa. Venation 
much as in L. cyatheti, but Sc, is scarcely longer than Sc,, and the straight 
tip of R, is about as long as r. No bristles on squama.  Halteres with 
pale stem, knob blackish with tip pale. Length of body, 10-16 mm. ; 
wing, 12-14 mm. 
Norra Istanp: Wellington district (G. V. Hudson, No. 200); type and 
one other male and two females in British Museum. SouTH ISLAND: 
Arthurs Pass, January, 1920, one female in Canterbury Museum; Tis- 
bury, Ist February, 1918 (4. Philpott), one male in Cawthorn Institute 
collection. 
. In spite of the very different structure of the hypopygium, this species 
is obviously nearly related to L. cyatheti. 
Genus GvNoPLiSTIA Westw. 
This large and fairly homogeneous genus is confined to the Australasian 
region, no species being known from west of Wallace's line. The variation 
in the number of antennal joints between the different species is great, but 
each species seems to be fairly constant. In view of this variation, it seems 
doubtful whether the South American Ctedonia should be kept distinct. 
* In May, 1922, I bred a series of Limnophila cyatheti from found in decayed 
y L pupae found in decay 
са а roe has very beautiful curved thoracic appendages, branched like 
