173 



(though longer than in the female), dense, and pale yellow, which 

 grows up longer and more conspicuous about the middle of the ba?al 

 segments, the apical black bristly hairs almost always more conspicuous 

 than in the female. Genitalia ferruginous though slightly dusted with 

 whitish, with two jointed lamella on each side, the basal joint transverse, 

 and the apical joint oblong. 



Length : I 3.5-I 5 mm. 



Among our entomologists, this species has unlortunately been 

 very much confused with Tabanus pyrrus, Walker (= ditaeniatus, 

 Macq.), but it is easily distinguished from the latter, by the absei c^ of 

 the lateral stripes (though sometimes appear apically), by its large black- 

 ish tip of the abdomen, by its comparatively narrow frontal stripe, by 

 its golden pubescence almost all over the body, by its black bristles 

 on the palpi, by its darker legs, by its less arched head, and by many 

 minor points; while the species is identical with T. fulvus from Europe, 

 being only slightly different from it in some minor points as already 

 described. The forms from Hokkaido are usually of a more golden 

 hue than those from Honshu, and are undoubtlully identical with 

 fulvus, but two specimens (male and female) from Misaki vary very 

 much in appearance from the others, with rather whitish pubescence 

 and having the faint lateral stripes not reaching to the basal abdominal 

 segments, hence it may be a distinct species. There two, however, 

 are probably the same as the northern forms, as some intermediate 

 forms have been found. 



This handsome species usually occurs in Japan from June to 

 September, and the females bite horses and cattle in pasture ; it is 

 noticed by our veterinary surgeons that this species may be a transmit- 

 ter of a certain infectious anoemia of horses. 



2. Atylotus rusticus, Linne. (PI. Ill, fig. 8). 

 ( Nohira-Abn). 



Tabanus rusticus, Linne, Syst. Nat., ed. XII, p. IOOO, 1767. 



