180 SYRPHID.^. 



pubescence; scutellum brownisli-orauge with browuish-yellow 

 pubesceuce. Abdomen orange-yellow ; 2nd segment witli a lai'ge 

 black spot filling half anterior margin, cut away triangularly on each 

 side and not reaching hind margin, its hinder part less broad than 

 the front part ; 3rd segment with a black spot reaching from 

 anterior margin, of which it fills the centre third, gradually 

 widening till it nearly attaius hind margin, whicli latter is narrowly 

 orange; also generally with a more or less distinct bluish cross- 

 band ; 4tli and 5tli segments shining black, 4th bluish-tinged, with 

 hind margin narrowl}' orange. Pubescence of abdomen all pale 

 yellow, rather dense and long, paler towards tips and on venter. 

 la 2 i abdomen black, a large triangular orange-yellow spot on 

 each side of ;^i)d segment; hind margins of 2iid, 3rd and 4th seg- 

 ments from orange-yellow to yellowish-grey. Legs black; tips of 

 femora, basal two-thirds of anterior, basal half of hind tibiae, also 

 middle metatarsi, orange. Pubescence mainly pale yellowish ; 

 hind tibia? with some black pubescence on apical half and on 

 nnder side beyond the middle. Wings nearl}^ clear, a little 

 yellowish at base and in front ; stigma small, brownish ; halteres 

 and squamse yellow. 



Length, 9-11 mm. 



The above description is mainly from Yerrall's account of British 

 specimens, as I have seen only one specimen frou) British India, a 

 $ from Kashmir, 1915 (Pease), in the Indian Museum ; but there 

 can be no doubt of its identity. The species should not be rare 

 in the Western Himalayas, considering that it is probably the 

 commonest in Europe after tenax; yet I have not met with it 

 either in India, China or Japan. It has been recorded from North 

 Persia, Siberia, and North Africa. The extent of the yellow in 

 the abdomen is variable to some degree. 



145. Eristalis polychromatus, sp. nov. (PI. IV, fig. 5.) 



S $ . Head: eyes finely pubescent on upper part, closely con- 

 tiguous for fully one-third of the distance from vertex to base of 

 antennfe, reddish-brown with small darker spots ; vertical triangle 

 small, fully occupied by the ocellar prominence, which bears daric 

 red ocelli and blackish-brown hairs ; frontal triangle shining blue- 

 black with dark brown hairs and narrowly brown anterior margin ; 

 side margins of frons narrowly dusted \\\t\\ yellowish-grey. 

 Antennae brownish-orange, arista bare. Pace shining blue-black, 

 with side margins dusted with yellowish-grey, and with a little 

 yellowish-grey pubescence on lower half, except on the broad 

 median black stripe, the moderately prominent, bare central bump 

 and the narrow cheeks and mouth-boi'der. Occiput grey-dusted, 

 upper margin with a little dark brown, lower one with whitish- 

 grey, pubescence. Thorax: dorsum with yellowish-grey tomentuui 

 and four shining black, almost equally broad, longitudinal 

 stripes from anterior to hind margin, the median two rather 



