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TH. BECKER: DIPTEROLOGISCHE STUDIEN 
und mit Ausnahme der Schienenendborsten auch borstenlos. — Flügel etwas grau ; die 4. Längs- 
ader in der gewöhnlichen Biegung wie bei stylata m. (vgl. dort die Figur). 3,5 mm lang. 
3 cf von Ceylon, Nr. 3090. Berliner Zoolog. Mus. 
11. limitata n. sp. Q- 
Q. — Thoraxrücken und Schildchen metallisch schwarzgrün, glänzend mit 5 Paar Dorsozentral- 
borsten und 2 Paar Akrostikalborsten. Schwinger gelb, Schüppchen braun mit schwarzen Wim- 
pern. — Kopf: Stirne von der Farbe des Thoraxrückens, Gesicht schwarzgrau; Fühler und Taster 
schwarz. — Hinterleib metallisch grün, glänzend, kurz schwarz behaart. — Beine mit allen Hüften 
schwarz, nur die Kniee, Schienen und Metatarsen der vorderen Beinpaare gelb. Beine dem Gat- 
tungscharakter entsprechend borstenlos. — Flügel wasserklar oder etwas grau; die Aufbiegung 
der 4. Längsader wie bei der Art stylata m. 2 mm lang. 
1 Exemplar aus Japan, 7. Juni 1909. Deutsch. Entomol. Mus. Berlin-Dahlem. 
Anmerkung. Angesichts der konstanten Bein- und Schwingerfarbe in dieser Gattung wird es 
möglich sein, das zugehörige Männchen aufzufinden. 
Gruppe X : 
Genera incertae sedis. 
Ostenia. 
HUTTON, Trans. New-Zealand Instit. XXXIII, 34 (1901). 
First joint of the antennae rather long, nearly cylindrical, without hairs, the second joint very 
short, with a curl of bristles; the third joint short, transverse, with short hairs; the arista dorsal, 
strong, bent near its base, almost bare. Eyes with very short hairs. Front broad in both sexes, 
bristles on the vertex and occiput. Proboscis short and stout. Thorax convex above, with a trans- 
verse hollow bef ore the scutellum ; mesothorax and scutellum with bristles. Abdomen large, oval, 
depressed, with a few short bristles; apparently of 5 Segments in the 9 , 6 in the <f. Hypopygium 
not inflected nnder the abdomen, but apparently withdrawn into the sixth Segment. Wings rather 
short and broad; the costa bristly. The auxiliary vein ends in the first longitudinal. The first 
longitudinal extends to nearly half the length of the wing; the fourth longitudinal simple, nearly 
parallel to the third; posterior cross-vein distant from the margin by more than twice its length. 
Legs short and stont for the family; the femora and tibiae with long scattered bristles. 
This genus appears to come nearest to Xanthochlorus Lw., but it differs in the first joint of the 
antennae and the hypopygium, as well as in its robust form, oval abdomen and short legs. I liave 
named it after Baron OSTEN-SACKEN. 
1. robusta sp. nov. Hutton. 
Head and thorax brown, non-metallic; abdomen and legs darker with submetallic reflections. 
Antennae and proboscis piceous. Abdomen bluish black in the male, greenish black in the female. 
Wings brown; the veins dark-brown, lighter near the base; the second longitudinal vein bent back- 
wards near the tip; the third parallel to the second, but more bent down near the tip; the fourth 
nearly parallel to the third for three-quarters of its length, then bent slightly forwards towards 
