19 



j " 



1. Corizoneura yezoensis, Shir. (n. sp.) 



(PI. Ill, 6g. I ; SI. IX, figs, i & 2.) 



(JUaniifata-AJm.) 



There is no closely allied species in the world, but in apperatice 

 somewhat similar to Diatomineura ticardoi Hutt. 



Small greyish black species, with rather short proboscis. 



Female. Head nearly three times broader than its length. Frons 

 about one-sixth the width of the head, and about three times longer 

 than wide, parallel-sided, grey slightly tinged with yellowish, without 

 frontal callus ; two distinct longitudinal depressions at the middle part, 

 near lateral margins, extending to the ocelligerous tubercle ; an irregular 

 transverse depression about the centre of the frons, and a fine longitu- 

 dinal sulcus from the transverse depression to the ocelligerous tubercle;, 

 pubescence on the frons very few and inconspicuous, greyish. Vertex 

 grey, bearing a large somewhat triangular ocelligerous tubercle which 

 is rather prominent and has three large yellowish ocelli ; pubescence 

 yellowish white, very sparse but slightly abundant behind the ocellige- 

 rous tubercle. Face grey, rather slightly arched with small facial 

 prominence ; pubescence mostly whitish, on the facial prominence stout 

 and brown with yellowish white one intermixed, entirely absent just 

 above the antennae ; pubescence on both the lower surface of the 

 mouth part and the jowls longer and softer than that on the other 

 parts of the face, whitish and abundant, this pubescence extending 

 half-way up to the back of the head, after which a short yellowish fringe 

 begins, which gradually lengthens and hardly overhangs the eyes until 

 it merges in the yellowish white hairs on the vertex. Proboscis thin 

 and short, about equal as long as the depth of the head, blackish red 

 brown, bearing rather broad but small dark brown sucker-flaps ; 

 pubescence very spare and inconspicuous on the lower surface, on the 

 upper surface almost entirely absent, on the sucker-flaps rather con- 

 spicuous but ver>- short. Antennae small, short, hardly longer than 



