391 



tomentose shallow triangles furnished with yellow hairs at the middle 

 of the second, third, and fourth (or sometimes to fifth) hindmargins, 

 and the rest of each of those hindmargins has an orange fringe, and 

 this fringe grows a little longer at the hind corners of each segment ; 

 fifth hindmargin with the yellow fringe restricted to the side quarters ; 

 sixth segment with longer yellow hairs at the sides ; the remaining 

 pubescence on the dorsum longer, dense, inconspicuous, and to a large 

 extent black, and on the blackish portion of the basal segment there 

 are some very short yellow hairs just under the sidemargins of the 

 scutellum ; sidemarginal pubescence black, except narrowly at the ends 

 of the segments and on the sides of the first two segments. Belly 

 orange or dark orange on the four basal segments except for a small 

 blackish grey spot at the middle of the base in darker specimens, but 

 the end segments blackish excepting of the narrow yellow hindmargins; 

 pubescence dense, and black, but orange yellow on the hindmargins 

 (except on the seventh segment) or in the paler specimens longer 

 tuft on the middle base of the second segment orange yellow ; seventh 

 segment "with several longer stiffer black hairs all about the middle. 



Length : 19-20 mm. 



This species has an appearance of Therioplectes sotstitialis, Meig., 

 but is easily distinguished from that by the absence of the ocelligerous 

 tubercle. It is also allied to the paler form of Tabamts exoticus, 

 Ricardo, but it is distinguished from it by the somewhat distinct 

 yellowish grey stripes on the darker rather blackish thorax, by the 

 longer tooth of the third antennal joint, by the lateral dark spots on 

 the abdomen, by the facets of the male eyes all being equal, and by 

 other minor points. 



This fly varies but very little in the colour of the legs and of 

 the abdomen, and in the amount of the black pubescence on the 

 several parts, as already mentioned. 



T. rufidens may be rather uncommon though it has rather a 

 wide distribution, as I have records from Sapporo, Akaiwa, Jiozankei, 



