1908.] Records of the Indian Museum. 69 



let Walker's name stand, because the introduction (by Mr. W. W. 

 Saunders) to Walker's paper in the Proceedings of the Linnean 

 Society of London is dated Jan. 14th, 1856, whereas Doleschall's 

 paper is dated March i6th, 1857. I have, however, no means of 

 deciding which was published first, both appearing in 1857. 

 H. doleschalli extends from Calcutta to Assam. 



H. conclusus, Wlk. 



H. albiceps, Wulp. 



These two species stand out from the remainder by the broad 

 oblique yellow stripe on the side of the thorax, which is absent in 

 the other four, and the recorded green wings of conclusus should 

 easily identify it. 



H. mesolcucus, Wlk. 

 H. censors, Wlk. 

 H. bengalensis, Wied. (PI. xii, figs. 4, 5, 6.) 

 H. quadrivittatus, Wied. (PI. xii, figs, i, 2, 3.) 



These four species must be closely allied, but a comparison 

 of specimens of the two latter species (which are not uncommon 

 in Calcutta, and are identified by me from Wiedemann's Auss. 

 Zweifi.) with Walker's t3'pes of the other two species, ma}" allow me 

 to speak definitely later on.' Walker sa^'s of mesoleucus^ "hind 

 femora thick," and of consors, " hind femora incrassated, hind tibise 

 curved." The femora are always thickened in this genus, and in 

 most cases the hind tibiae are curved also, although, of course, 

 a case of very distinct incrassation would clearly define a species. 

 As regards H. bengalensis , Wied., and quadrivittatus , Wied., they 

 are both good and distinct species although extremely closely 

 allied. Of the latter species Wiedemann saw only a single & 

 and expressed doubts as to its being distinct from the former one. 

 His distinctions as to the whiteness of the face and the colora- 

 tion of the legs I do not find reliable, but the differences of markings 

 on the 4th abdominal segment are quite consistent in both species. 



In bengalensis the 4th segment has a mark which \'aries greatly 

 in colour, — -yellow, red, brown, and deep black,- — but it is always 

 present, is clearl}^ cut, and in the form of an inverted V (or, some- 

 times, that of a bow) stretched out right across the segment. 

 In quadrivittatus this mark is absent, the segment being black 

 with whitish dust at each side, the ground colour showing roughly 

 in the form of a triangle with its apex on the base of the seg- 

 ment. Both species are moderately common in Calcutta and I 

 have examined a good many of both sexes of each, including a 

 long series of quadrivittatus from Bangalore, South India, in the 



' Specimen.s deterniiticd by me as H. bengalensis , Wied., have been confirmed 

 fis ^iicli by Herr. Handlirsch of the Vienna ^luseum aftercomparison with the type. 



