64 



very often found on the back of cattle or horses, as well as in shrubs. 

 I have records from Sapporo, Josankei, Morioka and Takasago, from 

 July 26th to August 1st. 



5. Chrysops basalis» Shir. (n. sp.) (PI. II, figs. 2 & 3 ; 



PI. IX. figs. 3 & 4.) 

 CKiposhi-Mekiira-AlmO 



Smallest species with the black abdomen except the second seg- 

 ment almost entirely yellow, and the wings with a broad cross-band 

 which is extremely deeply incised from the posterior margin. Very 

 closely allied to the preceding species. 



Female. Head rather large, much broader than the thorax, 

 frons broad, usually parallel-sided but sometimes very slightly divergent 

 towards the antennae, depressed across the middle because the ocellar 

 triangle above and the large frontal callus below are rather elevated, 

 black or blackish castaneus brown, shining but the part between the 

 frontal callus and vertex very minutely granulated and concave ; 

 antennal tubercle at the middle deeply incised above, brown slightly 

 obscured by a greyish tomentum below the frontal callus, which is 

 very large, convex and shining black or dark brownish black, the up- 

 per margin of the callus being very slightly incised and its lower 

 margin being moderately angulated ; pubescence on the frons rather 

 long and pale yellow, and on both the callus and antennal tubercle 

 quite bare, vertex blackish moderately convex, with an inconspicuous 

 ocellar tubercle which is somewhat conspicuously dusted with yellowish, 

 this colour at the lower side outwardly obliquely expanding to near 

 the upper margin of the frontal callus but very narrowly like a fine 

 stripe ; pubescence on the vertex long and mainly pale yellow with a 

 very few blackish hairs intermixed ; occiput blackish, somewhat con- 

 spicuously obscured by a yellowish dust, and furnished with rather 

 numerous long somewhat puffed yellowish hairs. Face similar to 



