igo8.] Records of the Indian Museum. 79 



Wings pale grey, mediastinal cell uniformly l)rownish yellow; 

 no distinct stigma. Halteres bright yellowish red. Tegulse whitish 

 grey. 



Described from a single & in good condition in the Indian 

 Museum collection from Margherita. 



This species must be very near nigroaenescens, Rond., l)ut his 

 description of the abdomen does not quite agree, and he says 

 the antennse are black, whereas in auronitens they are bright reddish 

 brown. My longer description will enable some author to decide 

 whether it is synonymous with Rondani's species or not. 



X. assamensis, mihi, sp. nov. 

 9 . Assam (Kohima). lyong. 13 mm. 



Frons shining ])lack narrowing towards vertex^ a slight trace 

 of a grey poUinose line across the centre ; face below antennae 

 tawny, with minute not very strongly marked silvery white pubes- 

 cence ; proboscis blackish brown ; antennae brown ; a fringe of 

 yellowish hair behind eyes at the sides. 



Thorax^ dull violet bronze, nearly bare, sides black, some yellow 

 hairs in front, at the base of the wing ; scutellum unicolorous, 

 yellow hair at sides and on posterior border. 



Abdomen, dull violet aenous, nearly bare, but with minuteh^ 

 yellowish pubescence seen from in front. 



Legs, bright red tawn3^, with very slight yellow hair ; coxae 

 black ; posterior femora with traces of a brown mark in the 

 middle of the upper side. 



Wings, pale yellowish tawny, stigma tawm-. Halteres brown, 

 alulae brown with a fringe of thick 3'ellow hair behind. 



Described from one 2 in the Indian Museum collection. 



The Oriental species of this genus may be separated thus — 



Abdomen with distinct bands or spots. 



lyCgs black. . . . Long. 11 mm. nigronhiescens , Rond. 



Legs partly tawny. 



Abdomen with two broad interrup- • 



ted testaceous bands. 



Thorax unstriped ; antennae ■ ' • ' 



black ; basal half of femora 

 pale . . Long. 8 mm. calopus. Big. 



Thorax with two testaceous 

 tomentose stripes ; antennae 

 tawny ; femora chalybeous. 



Long. 10 mm. conformis, Wlk. 

 Abdomen with six bands. 



Long. 12 mm. csqualis , Wlk. 

 Abdomen unicolorous, or at least, without 



distinct bands or spots. - . ',, 



Legs tawny or red. / 



Abdomen tawny towards the base. ■•'• 



Long. 10 mm. cethusn , Wlk. 



