1908.] Records of the Indian Museum. 65 



W., quadrivittatus , W., and insignis, Dol. ; plates of ciirvigaster , 

 Mcq., notabilis, Mcq., insigiiis, Dol., and pilipes, Dol. ; two new 

 species in the Indian Museum collection which I have named 

 aenus and tiibcrculatus , both very distinct from all others, and 

 descriptions onh^ of the remainder. I think the table may assist 

 as an introduction to the better study of this genus, but I find 

 great difficulty in understanding the true affinities of Walker's 

 species. 



Table of Oriental species of Helophilus. 



A Face perpendicular, not produced as 

 usual, nor excavated below antennae, 

 nor gibbous above mouth. Hind tibicC 

 incrassated . . Long. 11 mm. Celebes, O.S. 



AA Face distinctly and normally produced 

 (exceptionally so in notabilis, Mcq.). 

 Hind tibicE not incrassated. 

 B Thorax with transverse bands of pubes- 

 cence . . lyong. 8 mm. curvigaster, Macq. 

 BB Thorax with ground colour longitudinal 

 black and yellow stripes. 

 C Body aenous Long. 10 mm. aemis, mihi, sp. nov. 

 CC Body yellow and black, not aenous. 

 D Abdomen very elongated. 



E Middle legs not denticulated. Long. 22 nun. caudatus, Meij. 

 EE Middle legs strongly denticulated. 



Long. 17-25 mm. tuberculatus , mihi, 

 sp. nov. 

 DD Abdomen of the ordinary oval or ovate 

 shape. 

 F Anterior femora and tibiae with dense 



yellow hair . . Long. 12 mm. pilipes, Dol. 



FF Anterior femora and til^ise moderately and 

 normally haired. 

 G Length 14 to 16 mm. 

 H Abdomen with two luteous bands. 



J Shining blue above antenucie. Long. 16 mm. doleschalli, mihi. 



(Change of name from insignis, Dol.) 

 J J Blackish brown above antennae. 



Long. 15 mm. vestitiis, W. • 



HH Abdomen with three luteous bands. 



L vSide stripe on thorax yellow. Long. 16 mm. insignis, Wlk. 

 LL No side stripe (presumably). Long. 14 mm. notabilis, Macq. 

 00 Length 9 to II mm. (in niesoleucus 13). 

 M Sides of thorax with broad oblique yellow 



stripe. 

 N Legs mainly luteous, " shaded with black," 



wings green . . Long. 10 mm. concliisus, Wlk. 



NN Legs mainly black, base of tibia? pale, 



wings not green Long. lo-ii mm, albiceps, Wulp. 



