193 



1. Tabanns kotoshoensis, Shiraki (n. sp.)(Pl. IV, 

 fig. 5 ; PI. X, figs, i & 2). 



(Chilii-Abu) 



Small species. Frontal stripe with two separated callosities, the 

 lower one elongate-quadrate, the upper one very fine and line-like ; 

 ground colour of the whole body unicolorus dull brownish black, except 

 the tibiae which have a large pale yellowish part. 



Somewhat allied to Tabanns formosieusis, Ric. and T. humil- 

 imns. 'Walk, but it is easily distinguished from the former by the 

 broad frontal stripe which has two separated callosities, and from the 

 latter by the less divergent frontal stripe which has two calli, the long 

 and slender antennal third joint, etc. 



Female. Head conspicuously broader than the thorax or abdomen, 

 moderately arched, the ground colour blackish but entirely covered 

 with a greyish tomentum. Frontal stripe moderately widened above 

 with almost straight sides, about four times as long as its broadest part 

 or fully seven times as long as its narrowest part, dusted with yellow- 

 ish grey and furnished with rather numerous brownish black pu- 

 bescence which is mostly sloping below but there is a few erect one and 

 which becomes shorter and sparser towards the lower callus ; the 

 surface inconspicuously convex above, but slightly depressed just above 

 the lower callus ; lower frontal callus black and shining, moderately 

 prominent, elongate-quadrate (not transverse), only occupied about the 

 middle half of the width of frontal stripe, the upper callus not con- 

 spicuous, very fine and about as long as the lower one, not elevated, 

 black not shining. Vertex somewhat distinguished from the frontal 

 stripe by a minute ocellar tubercle which is elongate-oval and is not 

 clothed by dust, ashy greyish black, furnished with a few scattered 

 black pubescence which is similar to that on the frontal stripe. Frontal 

 triangle slightly inflated, entirely separated into two lateral spaces by a 

 distinct central sulcus, clothed with a yellowish grey tomentum, but 



