ISC 



is so characteristic of that species, and the smaller size, while more 

 exact distinctions are given in my description of A. fulvus. 



I think Coquillett's pyrrhus may not be ditaeniatits as Ricardo 

 thought, because in the duplicates of" specimens sent to the U. S. 

 National Museum by the late Prof. Mitsukuri there is no ditaeniatus, 

 but fulvus and bivittatus. 



This species is one of most common species throughout Japan, 

 as I have records from Sapporo, Otaru, Akita, Tokio, Takasago, Kioto, 

 Yabakei, Matsuyama, Taihoku, Horisha, Shoka, and Tamsui, from May 

 3rd to August 24th. In Formosa the flies are rather common in rice- 

 flields, and the females bite the belly of catties mostly at afternoon or 

 evening. 



4. Atylotus negativus, Ricardo. 



Tabanns nagativus, Ricardo, Rec. Ind. Mus. IV, p. 137, 1911 ; Ann. 

 Hist. Nat. Mus. Hung. Budapest, XI, p. 168, 1913. 



A medium-sized greyish yellow species, with no callosities on 

 the almost parallel- sided broad frontal stripe, with the uniformly greyish 

 yellow tomentose thorax and abdomen but the median dark ground 

 colour on the abdomen can see through the dust, with no recurrent 

 veinlet in the clear wings, and with the pale reddish yellow legs. 

 Length: 13 mm, in the female; 11.5 -12.5 mm. in the male. 



Female. Face covered with a greyish tomentum and with a 

 white pubescence. Beard scanty, white. Palpi pale yellow, with a black 

 pubescence, stout ending in a short point. Antennae reddish yellow, 

 the first two joints pale yellow, the third with hardly any tooth. 

 Forehead with no callus, almost parallel-sided, about four times as 

 long as it is broad. Thorax and abdomen uniformly covered with 

 greyish yellow tomentum, through which the dark ground colour hardly 

 appears, and with thick short pale yellow pubescence on the dorsum 

 of abdomen, on the thorax it is less thick and replaced chiefly by 

 black pubescence anteriorly, shoulders the same colour. Breast rather 



