53 



genitalia brownish black with two yellowish apical lamellae which have 

 round apical margin and bear a few pale hairs. 



Length : 9-IO.3 mm. 



This species is easily distinguished from the other species of 

 Japan by its peculiar somewhat zig-zag-shaped cross-band of the wings. 

 It probably occurs throughout Formosa, although I have taken it from 

 a few localities, Taihoku, Tamsui, Kagi, Tainan and Kosempo. In 

 my observations during a few years, Chrysops sinensis is common 

 in Formosa but the occurence is not so abundant as in C. dispar. 

 It is recorded from May 15th to November 10th in Formosa, while 

 it is known that it occurs in China. The female generally attacks 

 cattle in the afternoon but especially near the sunset, and it often bites 

 the back of a human body when any part is bare. On the 10th of 

 November in 19 17, my wife had her arm pierced by the fema'e in a 

 room already lighted up about nine o'clock in the evening, and its effect 

 continued for wholly two days, remaining a small swollen point, but 

 she felt not much irritation. 



4. Chrysops suavis, Loew. (PL I, figs. 7 & 8.) 



CMckura-Abii) 



Wien. Ent. Monatschr., II, p. 103, 1858; Verh. Zool.-Bot. Ges. Wien, 

 VIII, p. 620, 1858. 



Ricaido, Ann. Mag. Nat. Hist. (7), IX, pp. 427 & 430, 1902. 



Kertesz, Cat., Dipt., Ill, p. 198, 1908. 

 Chrysops dispar, Matsumura, Thous. Ins. Japan, II, p. 81, pi. XXIV, 



fig- 5. I905- 



Rather large species with the black femora, with the black 

 abdomen, with the conspicuous orange markings at the sides of the 

 two basal segments, and with the apical abdomenal segments black 

 leaving a narrow orange yellow median stripe. 



Female Head rather small, about as broad as the thorax. 



Frons quadrate with the straight sides, very slightly broadened towards 



