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昆蟲 學雜餘 第^ 卷第謇 號 



4. Chrysotoxum laponicum Mats. (n. sp.) PI. I, fig. i, ^. 



Face reddish yellow, in the middle with a shining black stripe, near 

 the upper margin of the mouth-opening with a small tubercle ； antenna レ 

 process shining black on the posterior half ； near the vertex with two 

 triangular grayish spots ； vertex shining black, hairs of eye-margins 

 white ； on the cheeks 2 black lines, which connecting eyes and mouth- 

 margin. Antennae black, very long, the second and third joints together 

 spindle-shaped ； the light yellow, black at the tip. 



Thorax quadriangular, from the anterior margin down to the middle 

 with two grayish white stripes ； on each lateral margin with a reddish 

 yellow-stripe, which being cut at the suture ； on the pleurae with three 

 reddish-yellow markings ； dorsum with thick, short, fine, yellow hairs. 

 Scutellum yellow, covered with fine yellow hairs, in the middle with a 

 black spot. 



Abdomen black, on each segment, except the first, with an arched 

 grayish yellow band, which being cut in the middle, at the margin black; 

 on the sides at the base of the second segment with long white hairs. 

 Ventral side black, with three yellow bands, which except the second 

 segment being cut in the middle. Legs ocher yellow, at the bases of 

 femora black. Wings transparent, tinged with light brown, the veins 

 brown, stigma fuscous. 



Length 一 ビ宇 1 1. 5-12. 5 mm. ； exp. 25 mm. 



Hab. ― Honshü. (Nikko). 



Jap. name — Yamato-higenaga-hanaahu. 



5. Chrysotoxum biguttatum Mats. (n. sp.) PI. I, fig. 2, <f • 

 Much resembles to the former species, but differs from the latter as 

 follows ： 



Thorax on each side with a ochreous spot. Hairs of the thorax 

 black. Scutellum black, at the posterior margin being yellow. Abdomen 

 black, with yellowish bands, the band of the fourth segment not being 

 cut in the middle, the band of the second broad and curved, apparently 

 deeper coloured than those of the other segments, the second band very 

 slender, the third band being far broader, the fourth band narrower than 

 the third. 



