The Philippine journal of science. [Vol. 67, no. 1]

158

The Philippine Journal of Science

1938

Male.-Length, about 10 millimeters; wing, 11.
Rostrum and palpi black. Antennae 16-segmented, black
throughout; basal flagellar segments subglobular, outer segments more elongate; terminal segment one-half longer than
penultimate. Head black, with a yellow pollinosity.
Pronotum dull brownish black. Mesonotum polished black,
vestiture sparse but erect. Pleura black, sparsely pruinose, especially on ventral pleurites, Halteres pale yellow. Legs with
coxae black; trochanters brownish black; femora black, bases
narrowly (basal fifth or sixth) yellow; tibiae and basitarsi
brownish black, tips darker; remainder of tarsi black. Wings
(Plate 1, fig. 20) brownish yellow, prearcular and costal regions clear light yellow; stigma oval, dark brown; restricted
brown seams along cord, outer end of cell 1st M2, along vein
Cu, and as a spot at origin of Rs; veins brown, yellow in
flavous areas. Venation: Cell M1 present; m-cu beyond midlength of cell 1st M2.
Abdomen, including hypopygium, black. Male hypopygium
(Plate 3, fig. 40) with caudal margin of tergite, 9t, with a deep
U-shaped median notch. Outer dististyle, od, with outer setiferous lobe long and conspicuous; inner lobe terminating in
an outer slender spine, inner lobe flattened, vaguely toothed.
Inner dististyle, id, simple, terminating in four or five strong
spines. ZEdeagus, a, moderately narrow, tip long-produced.
Gonapophysis, g, distinctive, pale yellow; stem very slender,
head expanded, its inner angle produced into a slender spine,
opposite end deep, more or less cultriform.
Habitat.-Northern Korea.
Holotype, male, Ompo, altitude 150 feet, May 29, 1937 (Yankovsky).
Limnophila (Prionolabis) acanthophora is quite distinct from
the now rather numerous species of the subgenus in eastern
Asia. The shape of the gonapophysis of the male hypopygium
is entirely different from that in the forms hitherto described.
LIMNOPHILA (IDIOPTERA) USSURIANA Alexander.
Limnophila (Idioptera) ussuriana ALEXANDER, Philip. Journ. Sci. 52
(1933) 142, 143.
NORTHERN KOREA, Ompo, June 9, 1937 (Yankovsky).
LIMNOPHILA (ELMEOPHILA) SUBAPRILINA Alexander.
Limnophila (Ephelia) subaprilina ALEXANDER, Ann. Ent. Soc. America 12 (1919) 340, 341.