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conspicuous outer-upper black fringe and a short inconspicuous inner- 

 lower one ; tarsi all darker than the tibiae of which the front pair is 

 much blackish and is rather flattened from above to beneath and it has 

 yellowish sole, while the two posterior pairs have a reddish soles ; the 

 apical spurs of the middle tibiae moderate in length and blackish brown ; 

 pulvilli orange yellow, but paler on the front legs ; claws black with 

 the extreme base yellowish brown. 



Abdomen about the base about as wide as the thorax and 

 gradually narrowed to a narrow point, somewhat conical and slightly 

 longer than the head and thorax (including the scutellum) together. 

 Dorsum blackish brown or reddish brown, darker towards the anal ex- 

 tremity, with the segmentations very indistinctly paler ; the two first 

 segments conspicuously paler, and covered with dense snow whitish 

 tomentum ; the pubescence black, fine short and dense, but very sparse 

 and inconspicuous on the white tomentose segments, which becomes 

 longer and denser towards the apex and the sides at where there are 

 somewhat conspicuous black fringes. Ventre paler than the dorsum, 

 densely covered with shorter and finer depressed black pubescence 

 which on the middle of the basal segment becomes erect and conspicu- 

 ously longer, the seventh segment covered with numerous longer erect 

 slightly curved black bristly hairs. Genitalia with two dark brown la- 

 mellae covered with short black pubescence. 

 Length : 1 8 — 20mm. 

 This species is easily distinguished from all the other species by 

 the first two segments of the abdomen being whitish, and by the quite 

 clear wings. T. crassus is quite a rare species in Formosa and proba- 

 bly in other countries, and in Formosa its occurence may be restricted 

 only to the southern parts. The female is still unknown among ento- 

 mologists. I have only two males from Takao (July 27th). 



22 Tabanns fuscicornis, Ricardo. 

 (Kuro-bane-Abu.) 



