289 
Anterior wings broad, subcosta long, marginal vein 
long, as long as subcosta, radius quite short. All hairs 
on surface of wings in regular rows, fringe very short, 
only some long hairs at subcosta; posterior wings broad, 
knifeformed, hind fringe long, front fringe short; surface 
with several rows of fine hairs. Ovipositor and genitalia 
of male very long and powerful. 
(The name Centrobia meaning the one with the po- 
werful ovipositor). 
Of this genus, two species are known in this country, 
which may be distinguished by the following characters: 
Anterior wings with 17 rows of hairs, stigma present, 
Aniennæs Siorter atid thicker i. 6... 2... C. Walkeri Förster. 
Anterior wings with 24 rows of hairs, stigma absent, 
Antenne longer ANG? thinner 4.2.5 + 6 see C. Försteri n. sp. 
Centrobia Walkeri Forster. 
1851 Calleptiles Walkeri. Forster Verh. nat. Verh. f. Preuss. Rhein. 
0, 251: 
1856 Centrobia Walkeri: Förster Hym. Stud. II. 1856. p. 87. 
1898 Centrobia Walkeri. Dalla Torre Cat. Hym. V. p. 4. 
1904 Centrobia Walkeri. Ashmead Classification. p. 360. 
1915 Centrobia Walkeri. Wolff Zeit. f. Forst- u. Jagdw. XLVII, p. 561. 
O ¢ yellow brown. Underside slightly darker than up- 
perside. 
Q. Pedicellus about ?/, of scape, two funiculus joints to- 
gether 2/, of pedicellus, first joint of funiculus quite small, 
1/,—1/, of second joint, the three joints of clavus almost 
of equal length, the intermediate very slightly longer than the 
two others, the single joints of clavus about as long as both 
joints of funiculus together. Sensehairs apparently present 
in greater number than in male. Ovipositor of abnormal 
length for so small an insect, folded up under abdomen; 
saw bent upwards at apex with three, perhaps four teeth. 
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