Pseudosmittia holsata Thienemann et Strenzke

(Fig. 5)

Pseudosmittia holsata Thienemann et Strenzke, 1940: 238 .

Pseudosmittia hachijotertia Sasa, 1994: 48; Yamamoto (2004: 87). Syn. n.

Material examined

JAPAN: Tokyo Metrop., Hachijyo Island, Tohmi Water Fall, holotype ♂ of P . hachijotertia, 29.v.1994, M. Sasa (NMST, No. A 265: 69). In addition material from Austria, China, Germany, and USA has been examined.

Diagnostic characters

The male imago has 2 acrostichals, superior volsella consisting of rounded, well developed basal swelling of inner margin of gonocoxite and lacking microtrichia at the margin, triangular anal point, virga slightly more than 1/3 as long as the gonostylus, crista dorsalis preapical and conspicuous, and AR of 0.21–0.27. The female imago is characterised by R 4+5 ending distal to the apex of M 3+4, costa with 23–24 non­marginal setae between R 1 and apex of R 4+5, and LR 1 of 0.53–0.55. Pupa with stronger anterior and posterior, weaker median shagreen on tergites, without spinules on tergal conjunctives III/ IV, anal segment with 2 posterolateral mounds each with 2 strong contiguous teeth with setae between. Larva with 3 inner teeth on mandible, mentum with 4 pairs of lateral teeth, posterior parapods with 5 claws, and antennal blade subequal in length to width of basal antennal segment.

Description The species will be redescribed in a world­wide revision of Pseudosmittia (in prep.).

Ecology and distribution

According to Strenzke (1950: 292) the larvae occur on submersed moss on solid substrates especially along the shores of lakes, but also in springs. The Nearctic larvae all were collected from a moist bank of the Savannah River. The species is known from Austria, Germany, China, Japan and the USA.

Pseudosmittia jintuoctava (Sasa) comb. n.

(Figs. 6, 7)

Mesosmittia jintuoctava Sasa, 1990b: 46; Yamamoto (2004: 51).

Material examined JAPAN: Honshu, Toyama Pref., Jinshu River at Ousawano, holotype ♂, 30.v.1989, M. Sasa (NMST, No. A 207: 38, misspelled Mesosmittia jintunona) .

Diagnostic characters

The male imago differs from other Japanese species of the genus by antepronotal lobes not reduced medially, about 4 acrostichals, supraalar present, superior volsella indicated as basal swelling, and inferior volsella with accessory lobe.

Description

Male (n = 1). Total length 1.98 mm. Wing length 1.10 mm. Total length/wing length 1.80. Wing length/length of profemur 2.64. Coloration pale brown with darker brown vittae, preepisternum, scutellum and postnotum.

Head (Sasa 1990b: fig. 9a). AR 0.61. Terminal flagellomere 244 m long, apically slightly expanded, then abruptly narrowed with pointed apex. Temporal setae 4, consisting of 1 inner vertical and 3 outer verticals. Clypeus with 6 setae. Tentorium 198 m long, 30 m wide. Stipes 83 m long, 26 m wide. Palpomere lengths (in m): 26, 38, 56, 56, 71; third palpomere with 2 sensilla clavata.

Thorax (Sasa 1990b: fig. 9c). Antepronotal lobes not reduced medially, antepronotum with 4 lateral setae. Dorsocentrals 5, acrostichals 4, prealars 3, and 1 supraalar seta. Scutellum with 6 setae.

Wing (Fig. 6; Sasa 1990b: fig. 9d). VR 1.27. Anal lobe weak. Costal extension 26 m long. R 4+5 ending distal to apex of M 3+4; Cu 1 distinctly sinuate. Brachiolum with 1 seta, other veins bare.

Legs. Spur of fore tibia 34 m long; spurs of middle tibia 19 m and 15 m long; of hind tibia 38 m long, the other lost (Sasa 1990b: figs. 9e–g). Width at apex of fore tibia 26 m, of middle tibia 30 m, of hind tibia 34 m. Number of setae in comb not measurable, but setae 21–34 m long. Lengths and proportions of legs as in Table 2.

Hypopygium (Fig. 7; Sasa 1990b: fig. 9 h). Anal tergite apparently with complex, possibly divided anal point or longitudinal ridge (specimen distorted); tergite IX with about 8 setae; laterosternite IX apparently with 2 setae. Phallapodeme 95 m long; transverse sternapodeme 59 m long, with barely projecting oral projections. Virga 6 m long, 5 m wide at base. Gonocoxite 166 m long; superior volsella barely indicated as basal swelling; median volsella absent; inferior volsella reaching to 0.66, accessory lobe to 0.75 of gonocoxite length. Gonostylus 55 m long; megaseta broad, 9 m long, 5 m wide. HR 2.50, HV 2.99.

Female, pupa and larva: Unknown.

Remarks

The hypopygium of the only known specimen is squashed and partly on its side. The interpretation of the anal tergite having a ridge similar to that in Mesosmittia Brundin thus may be incorrect.

Distribution The species is known only from Japan.