154 Dr. C. P. Alexander on 
Paratopotypes,3 2 2. 
“Collected in thick bush.” 
Limnophila ruapehuensis and L. watti appear to be related 
to the Nearctic L. brevifurca; Osten-Sacken. 
Gynoplistia dimidiata, sp. n. 
General coloration shiny coal-black ; antenne with fifteen 
segments; flagellar segments 1 to 9 with long flabel- 
lations, the longest about one-half as long as the flagellum ; 
fore tibia black throughout; posterior tibia with an obscure 
whitish ring ; wings indistinctly dimidiate, the cells beyond 
the cord conspicuously darker than cells R and M ; base of 
cell R clear ; 7 present. 
Male.—Length 5°2 mm. ; wing 5°8 mm. 
Rostrum and palpi black. Antennz black throughout ; 
13 flagellar segments, segments 1 to 9 with long flabel- 
lations, the longest (on segments 3 and 4) approximately 
one-half the length of the entire flagellum ; terminal four 
segments simple. Head shiny coal-black. 
Pronotum and mesonotum shiny coal-black. Pleura coal- 
black without pruimosity. Halteres pale, the knobs dark 
brown. Legs with the coxze brown, paler apically ; trochan- 
ters obscure yellow; fore femora obscure yellow on basal 
three-fifths, the dilated apex black, fore tibia and tarsi black ; 
hind legs similar, but the posterior tibize with an obscure 
whitish wing near mid-length that is about as wide as the 
dark apex beyond it ; pubescence of legs not conspicuous ; 
middle legs lacking. Wings with the area basad of the cord 
greyish subhyaline, beyond the cord conspicuously infuseated 
to give the wing a dimidiate appearance; cell Se darker 
than cell C; stigmal area large, brown, continued caudad as 
a seam along the cord; a narrow brown seam at origin 
of Rs; a faint brown clouding near the bases of cells 1 and 
Cu and including the outer ends of cells Cu, 1st A, and 
2nd A; base of cell & entirely clear ; veins dark brownish 
black. Venation: Sc short, ending just beyond mid-length 
of the short, strongly arcuated sector ; Sc, at the tip of Sc,; 
R,,3 very short, about equal to r ; 7 faint but evident, near 
mid-distance between the fork of R,,; and the tip of R, ; 
deflection of R,,, elongate, without macrotrichiz ; cell d/, 
about one-half longer than its petiole; basal deflection of 
Cu, near one-third the length of cell 1st M,. 
Abdomen shiny coal-black, the pleural appendages of the 
hypopygium obscure yellow. 
