180 



3. Atylotus bivittatns, Matsumura. 



(PI. IV, figs, i & 2 ; PI. IX, figs, ii & 12. 



(Fntasnji-Ahu, or Kiiro-\bu> 



Thous. Ins. Japan, Addit., II, p. 384, pi. XXQ, fig. 12, 1916. 

 Tabanus pyrrkus (Walk.), Matsumura, ^ ft &^ 3sk:1> &Wi< p - 73> 

 pi. I, fig. i, 1914 (pt)- 



A rather small greyish yellow species, the abdomen yellowish 

 with a blackish brown broad median and narrow lateral stripes, on the 

 median one appear greyish tomentose triangular spots, the lateral 

 stripes not reaching the base of the abdominal side and at apex 

 coalesce with the median stripe. 



Female. Head apparently broader than the thorax, arched. 

 Frontal stripe parallel-sided, about four times as long as it is broad, and 

 with two small roundish separated calli, of which the lower one is 

 yellowish brown to blackish, and the upper one is irregular in shape, 

 black, and smaller, being often hidden under the yellowish tomentum ; 

 frontal stripe greyish yellow, and bearing short sparse depressed whitish 

 yellow hairs all over and a very few stronger longer (but still short) 

 curved black hairs, but the black hairs do not extend to the part 

 between the upper callus and frontal triangle ; ocellar space dusted all 

 over so that no callus is visible, and covered with somewhat conspicuous 

 black hairs ; frontal triangle pale yellowish grey, with a fine orange 

 yellow longitudinal median sulcus which extends below to the antennae ; 

 face whitish yellow, with a faint tinge of greenish grey, moderately 

 convex, about as deep as wide, with the small lateral pits and somewhat 

 produced reddish brown upper oral margin, bearing fine short whitish 

 yellow pubescence which becomes longer on the jowls and about the 

 mouth ; back of the head pale ashy grey with a point yellowish tinge 

 especially on the back of the vertex, and moderately hollowed out 

 behind the eyes, and with a very narrow pale yellowish white post- 

 ocular bare rim, behind which is furnished with a short glistening pale 

 yellowish fringe which becomes much shorter towards the jowls, on 



