﻿1：]8 



昆蟲 學雜誌 第 卷 第四號 



the extreme base yellowish. 

 Length — ^ 12-13 mm. 



Hab. ― Hokkaido (Sapporo), Honshu (Kyoto) ； Europe, Siberia ； 

 not rare. 



2. Didea sachalinensis Mats, (n.sp.) (Pi. vi, fig. 5,57,) 

 Differs from D. fasciata Macq. as follows : 



$ Bluisn black, much smaller. Antennae entirely fuscous. Mesonotum 

 shining, without any trace of longitudinal stripe, less yellowish pubes- 

 cented. Scutellum with a bluish shade. Halteres yellow, with a brown- 

 ish spot near the base of the knob. Abdomen black, with 4 yellowish 

 bands, of which the first, 3rd and 4th bands being interrupted, the 2nd 

 very deeply emarginated and nearly interrupted. 1 he first black band 

 of the venter nearly divided into 3 spots. The other characters are those 

 of B. fasciata Macq. 

 Length ― $ lO mm. 



Hab. 一 Saghalien (Ohtani); i ^ specimen collected by Messrs. J. 

 Adachi and S. Isshiki. 



3. Didea japonica Mats, (n.sp.) (ri. iv， fig. 2, 20 

 Didea fasciata Mats. Thous. Ins. Jap. Vol. II, p. 95, PI XXV， 

 fig. 15 (1904);— Journ. Coll. Agric. Vol. 】V， Pt i. p. 78 ( 1911). 

 Aeneous. Face yellow, pale yellow pubescented. the antennal-process 

 and facial stripe above the tubercle fuscous, cheeks" alonp^ the eyes aene- 

 ous; vertex black, in the female the front with 2 black stripes, which 

 uniting at the vertex, fuscous pubescented Antennae fuscous, the arista 

 yellowish. Thorax on the sides yellv.nvish spotted, with 3 indistinct 

 fuscQus stripes ； in the disk brown and on the margins yellowish pubes- 

 cented. Scutellum olivaceous yellow, black pubescented. Wings hyaline, 

 veins, except the base, and stig^ma fuscous, Halteres brown, the stems 

 yellowish. Abdomen wish 3 yellowish bands, the first and 3rd bartds 

 being interrupted, the 2nd band in the female entire, in the male at the 

 hind margin almost to the middle incised, the 5th and 6th without bands ； 

 the first ve,"ntral segment with 3 black spots, the 2nd and 3rd each with 

 a fuscous band, which being produced triangularly towards the anterior 

 marenn. Legs black, the apical halves of the first and 2nd femora, as 



