371 



27. Tabanus exoticus, Ricardo, (PI. VIII, fig. 3 ). 



(Taiwau-Uslii-Abu). 



Ann. Nat.-Hist. Mus. Nat. Hung., XI, p. 170, 1913; Suppl. Entom., 



Ill, p. 64, 1914. 

 Tabanus trigonus, Shiraki, Tokubetsu-Hokoku, Agr. Exp. Stat., 



Governrn. Formosa, VIII, p. 2OO, 1913. 



A large blackish brown or reddish brown or sometimes reddish 

 yellow species, with rather narrow frontal stripe in which is a narrow 

 oblong blackish callus with a very long rather fine extension, with 

 greyish yellow median triangles and narrow bands on the abdomen, 

 with blackish or brownish legs, and with brownish wings. 



Female. Head very slightly broader than the thorax and 

 shorter than its half, moderately arched. Frontal stripe greyish yellow 

 to brownish yellow, narrow, gradually contracted from the vertex to 

 the lower end, wholly eight to eleven times as long as its narrowest 

 part or about five to seven times as long as its broadest part, bear- 

 ing rather abundant short but stout black pubescence which is mostly 

 sloping and extends more than the upper two-thirds, and which is 

 intermixed with some inconspicuous yellowish hairs about the middle 

 of the frontal stripe, the yellowish hairs extending below to or beyond 

 the frontal callus ; frontal callus blackish, oblong, narrow, moderately 

 convex, not reaching the eyes; with a linear extension which is about 

 one and a half times as long as the callus; vertex less yellowish than 

 the fore head, usually dusted with ashy grey tomentum and covered 

 with short black pubescence which extends behind but not overhanging 

 there though it is a little longer ; frontal triangle little convex, with 

 a very fine very inconspicuous median stripe which only extends up 

 about the middle, covered with thick greyish yellow tomentum in 

 blackish species or thick silvery white in reddish and yellowish ones, 

 iut the double lunules just above the antennal sockets always covered 



