igii.] G. RiCARDO : Revision of the species of Tabanus. 171 



Schiner thinks it is nearly related to Tabanus spoliains, Walker, 

 but not the same. It has in fact no kind of resemblance to the 

 Walker species. 



Brauer in Denkschr. Akad Wien, xlii, p. 191 (1880), remarks 

 that this species is ver}^ similar to Tabanus rectus, Loew, from 

 Spain and Marseilles, but that the large facets of the e^^es reach 

 to behind the ocelligerous tubercle, and the zone of small facets 

 above is narrow and not so broad as in Loew's species. 



This species and Tabanus administrans , Schiner (now equal to 

 Tabanus cl an sac ell a , Macq.), are related to Tabanus autumnalis , L., 

 and Ta6rt?ms r^c/z/s, lyoew, but the closed first or very much nar- 

 rowed posterior cell will serve to distinguish both species. This 

 species is distinguished from Tabanus clausacella by the absence of 

 spots on the sides of the posterior segments and b}" its larger 

 broader abdomen, and forehead not so narrow anteriorly. 



In Brit, Mus. coll. specimens & and 9 from Tientsin ; 9 

 specimens from Wei Hai Wei (" biting cows") ; from Chinkiang, 

 Yangtze River, Foo Chow, Shanghai; Formosa and Japan. 



Tabanus trigeminus is recorded from Japan, six 9 specimens 

 measuring 17-18 mm., the first posterior cell narrowed at opening. 

 A long series from Dr. Miyajima from Japan have this same 

 peculiarity. The species belongs to both zoological Regions. 

 It is rather a blackish than a reddish brown species, with well- 

 marked grey triangular median spot and lateral spots on the first 

 two or three segments. Th } first posterior cell of wings usuall3' 

 closed, but occasionally onh^ narrowed at opening. Face greyish 

 tomentose with 3-ellowish white pubescence. Palpi large, not very 

 stout at base, ending in an obtuse point, reddish yellow with 

 black pubescence. Forehead in 9 narrower anteriorly' , nearl}- 

 six times as long as it is broad, frontal callus oblong, reddish 

 brown, not reaching the e3^es, with a thick linear extension, the 

 forehead covered with grey or yellowish grey tomentum and grey 

 hairs, in many specimens a dark patch is present in the middle 

 with black hairs. Thorax brownish black with three white stripes 

 on dorsum and sides white, breast sides covered with greyish 

 tomentum. Scutelhiin blackish brown with grey tomentum bordered 

 posteriorly with grey hairs, on dorsum of thorax the pubescence 

 is white and black, at sides black, below white. A bdonicn black, 

 the first two segments might be described as black, the first with 

 three spots and the sides grey tomentose, the second with a large 

 median and two lateral grey spots, on the third segment in some 

 specimens there appear traces of a third spot, the segmentations 

 usually narrower than as described by Schiner but in the specimens 

 from Japan they are broader, grey tomentose slightly reddish 

 yellow below. Wings with first posterior cell closed with a short 

 petiole, or very narrow at the opening, the specimens from Japan 

 have it open, not closed, but very narrow; the c^ from Tientsin 

 the same. 



Length of si)ecimens 15 — 21 mm. 



