398 



red or yellowish red lateral spots on the second segment which some- 

 times extend below to the third segment, wholly obscured by a greyish 

 tomentum, with the narrow yellowish segmentations which are covered 

 with a yellow pubescence which extends on the median triangles and 

 more or less on the part of the lateral flecks of the usual Tabamts 

 type, the pubescence on the rest all black and short, but that on the 

 yellowish extreme sides of the segments yellow and slightly longer. 

 Underside black with the very narrow yellowish segmentations, densely 

 covered with a yellowish grey tomentum, but the lateral parts between 

 the first two segments more or less reddish yellow, clothed with a 

 short dense depressed yellowish pubescence which becomes blackish 

 on the middle thirds or more throughout the whole length, but that 

 on the posterior segments usually more extends towards the sides, 

 while the seventh segment is covered with numerous long curved black 

 bristly hairs. 



Length : 19-19.5 mm. 



I have to identified this species from the rather unintelligible 

 description of Coquillett, and I am, therefore, a little uncertain whether 

 it is correct or incorrect. However, the fact that there is no other 

 species identical with his statement that is accepted by me and the 

 above is described from such a species. This species may be rather 

 uncommon in Japan as I have only two records from Sapporo (August) 

 and Shibata (September), and is allied to T. rufidens, but easily distin- 

 guished from that by the more smaller dorsal hump of the third 

 antennal joint, the broader frontal stripe, the quite restricted reddish 

 lateral spots and very narrow yellowish segmentations of the abdomen, 

 the conspicuously contracting first posterior cell of wings, and the 

 abdomen on the underside quite blackish. 



